언리얼 엔진 5.7 출시 노트

새로운 기능

언리얼 엔진 5.7의 출시로 UE5 툴세트가 더욱 향상되었습니다. 이번 출시를 통해 렌더링, 캐릭터 및 애니메이션, 월드 제작, PCG 등 다양한 영역에서 향상된 기능을 제공합니다.

이 출시 버전에는 GitHub의 언리얼 엔진 디벨로퍼 커뮤니티에서 제안해 주신 여러 개선 사항도 포함되어 있습니다. 언리얼 엔진 5.7을 함께 발전시켜 주신 모든 분들께 감사드립니다.

AlexanderVeselov-arm, AlexBlackfrost, Almax27, andreibazi, az6667, Bit-Rot, Brian-PD, brpendle-ti, bturner, chrysos8201, ckendal3, ColinGulliver, CookiePLMonster, Darcy3000s, dasherman-ea, davidbaack, dmergele, DoubleDeez, DrewWeth, DTG-Will-Marshall, dyanikoglu, erebel55, Eric2-Praxinos, Erlandys, faisa-believer, foobit, gamethread, geordiemhall, glecko, GreenLightning, guansdu, H3mul, IngSubstance, iniside, jamesfAnet, jamespark-unreal, JasonCoombs, jdamdami, jerobarraco, jeysym, Jiboo, JohnJFarrow, Jordonbc, jorge-axiomvfx, jorgenpt, jpritchard1010, KaosSpectrum, KarimLUCCIN, KeithRare, kimkun07-k, kissSimple, klukule, KXOC, laurencei, lclara-BARB, LHG-JonAnderJimenez, ligazetom, LightKL, lsandersljungberg, LucaFranzo98, Maigo, MarcusSvensson92, Mario-Azcona, MartinWickhamFB, Mattiwatti, melku, michael-buschbeck-ms, Minus4-44, moumee, nickdarnell, phochstrasser, PICO-XR, QRare, r457-Ao2, rdunnington, reduf, redxdev, RiotJDebern, rohyunsang, sareali, serhanio, SilverWinter0511, slonopotamus, SoulSharer, sportbikerr1, ssutherland-riot, SukenderDontNod, Sythenz, teddemunnik, tioez326, tokyocplusplus, Tt-Wes, tustanivsky, Vaei, vladbelousoff, vogoltsov, WangKan, Wizzard033, wmiller, x157, yangskyboxlabs, yoonbigbear, zachlute-arenanet, ZeroEightSix, ZeroErrors, zhou-

렌더링

메가라이트(베타)

메가라이트가 이제 베타 버전으로 전환되었으며, 노이즈 감소와 전반적인 퍼포먼스가 향상되었습니다. 이 업데이트에는 다음과 같은 기능에 대한 지원도 포함됩니다.

• 디렉셔널 라이트

• 나이아가라 파티클 라이트

• 반투명

• 헤어 스트랜드

나이아가라 헤테로지니어스 볼륨

헤테로지니어스 볼륨이 이제 베타 버전으로 전환되었습니다. 이번 업데이트는 섀도 캐스팅 기능의 향상에 중점을 두며, 다음과 같은 새로운 기능을 포함합니다.

• 디렉셔널 라이트용 캐스케이드 섀도를 지원합니다.

• 비어 섀도 맵이 ‘에픽’ 엔진 퀄리티를 지원하면서 다음과 같은 이점을 제공합니다.

  • 섀도 생성 시간이 크게 단축되었습니다.

  • 상수 시간 섀도 쿼리를 지원합니다.

• 디퍼드 라이팅에서 추가되는 벡터 범용 레지스터(Vector General Purpose Register, VGPR) 부하를 줄여주는 섀도 마스크 프리패스가 도입되었습니다.

• 섀도 캐스팅을 활성화해도 더는 에디터를 재시작하거나 셰이더 컴파일을 수행하지 않아도 됩니다.

서브스트레이트

언리얼 엔진 5.7부터 정식 버전으로 전환되어 기본적으로 활성화되는 서브스트레이트 머티리얼은 고정된 셰이딩 모델을 대체하는 모듈형 물리 기반 머티리얼 프레임워크로서, 제어 기능, 확장 가능한 퍼포먼스 및 장기적인 유연성을 제공하여 표현력을 극대화할 수 있도록 디자인되었습니다.

서브스트레이트 머티리얼은 두 가지 렌더링 경로를 지원합니다. 

• 어댑티브 GBuffer: 최신 하드웨어에서 픽셀별 토폴로지와 레이어드 클로저 같은 고급 기능을 제공합니다.

• 블렌더블 GBuffer: 단순화된 예비 경로로, 다양한 플랫폼과의 호환성을 보장합니다.

나나이트 폴리지 및 스키닝(실험 단계)

나나이트 폴리지는 세 가지 핵심 시스템으로 구성된 업계 최고 수준의 렌더링 경로입니다.

• 나나이트 어셈블리: 폴리지 파트 인스턴스를 하나의 통합 유닛으로 관리합니다.

• 나나이트 스키닝: 바람 등 외부 시스템과의 상호작용을 통해 동적으로 움직일 수 있습니다.

• 나나이트 복셀: 픽셀 크기의 복셀로, 카메라와의 거리를 기반으로 디테일, 애니메이션 및 머티리얼 특성을 유지하면서도 원래보다 훨씬 적은 비용만으로 이를 구현할 수 있게 해줍니다.

이러한 시스템을 결합하면 현세대 하드웨어에서도 60fps 예산 내에서 생동감 넘치는 애니메이팅된 폴리지를 사용하여 한층 견고한 월드를 구현할 수 있습니다.

새로운 기능:

• 나나이트 어셈블리: 인스턴스된 파츠를 사용하여 폴리지 에셋을 빌드할 수 있어 에셋의 크기를 최소화할 수 있습니다.

  • 블루프린트 API를 통해 나나이트 어셈블리를 빌드할 수 있습니다.

  • 에디터 내 툴을 통해서도 선택 항목을 기반으로 나나이트 어셈블리를 손쉽게 생성할 수 있습니다.

  • USD에 대한 임포터 지원이 제공됩니다. 노출된 USD 스키마를 통해 DCC 툴에서 씬을 마킹하여 어셈블리로 임포트할 수 있습니다.

• 스켈레탈 메시 기반 다이내믹 윈드: 스켈레탈 메시 형태로 표현된 트리로서 새로운 다이내믹 윈드 플러그인을 통해 프로시저럴 윈드가 본에 영향을 미치도록 지원합니다.

• 나나이트 복셀: 원거리의 폴리지 지오메트리를 효율적으로 렌더링할 수 있습니다.

• TSR 얇은 지오메트리 탐지: 폴리지를 보다 효율적으로 처리할 수 있습니다.

SMAA(실험 단계)

모바일 및 데스크톱 렌더러가 이제 서브픽셀 모폴로지 안티 에일리어싱(Subpixel Morphological Anti-Aliasing, SMAA)을 지원합니다. 모바일 렌더러에서는 CVar r.Mobile.AntiAliasing=5, 데스크톱 렌더러에서는 CVar r.AntiAliasingMethod=5를 사용하여 활성화할 수 있습니다.

이 기능은 퍼포먼스에 대한 영향을 최소화하면서 고퀄리티의 에지 스무딩을 제공하여 비주얼 퀄리티를 향상해 주므로 모바일 게임에서 매우 효율적입니다.

• SMAA 안티 에일리어싱은 모든 플랫폼에서 사용할 수 있습니다.

• r.SMAA.Quality를 사용하여 퀄리티 세팅을 조정합니다.

• r.SMAA.EdgeMode를 사용하여 컬러 또는 휘도 간에 에지 탐지를 조정합니다.

• 큰 GPU 비용 증가 없이 에지 스무딩을 향상합니다.

현재 실험 단계 기능입니다. 퀄리티 세팅을 통해 퍼포먼스와 비주얼 퀄리티 간의 균형을 미세조정할 수 있습니다.

캐릭터 및 애니메이션

모션 매칭 추저 통합(실험 단계)

언리얼 엔진 5.7에서는 추저(Chooser)와 통합된 모션 매칭의 첫 번째 향상된 버전을 도입했습니다. 이를 통해 모션 매칭에서 어떤 에셋을 선택할 수 있을지를 사용자가 직접 제어할 수 있게 함으로써 이전 출시 버전에서는 데이터베이스 수준에서만 가능했던 제어를 개별 에셋 수준에서 수행할 수 있게 되었습니다.

즉, 최적의 포즈를 서치할 수 있을 뿐 아니라 선택기를 통해 게임 로직과 같은 추가 조건을 기반으로 에셋별로 결과를 필터링할 수 있습니다.

추저에 새로 추가된 '포즈 매치(Pose Match)' 필드를 통해 이러한 복잡성을 관리할 수 있으며, 모션 매칭과 선택기 간의 통합 디버깅도 지원합니다.

이 기능은 실험 단계입니다.

블렌드 셰이프 및 스컬프팅 툴

업계 표준 스컬프팅 워크플로의 유연성을 언리얼 엔진에서도 활용할 수 있게 되었습니다. 이번 업데이트에서는 스켈레탈 에디터 툴이 향상되어 모프 셰이프, 본 및 스킨 웨이트를 원활하게 생성하고 편집할 수 있습니다.

• 이제 스켈레탈 메시에서 본을 배치하고, 스킨 웨이트를 페인팅하며, 블렌드 셰이프를 스컬프팅하는 작업들 사이를 즉시 전환할 수 있습니다.

• 새로운 모프 타깃 뷰어가 추가되었습니다.

• 셰이프가 메시 토폴로지의 변경사항에 맞춰 변경됩니다.

• 애니메이터에게 스튜디오급의 퀄리티 퍼포먼스를 구현할 수 있는 강력한 표현 툴을 제공합니다.

컨트롤 릭 피직스를 위한 월드 콜리전

컨트롤 릭 피직스 시뮬레이션에 레벨 콜리전을 추가할 수 있습니다. 월드 지오메트리와 피직스 바디를 사용하여 사실적인 컨택트, 푸시 및 인터랙션을 구현할 수 있습니다.

• 컨트롤 릭 피직스가 단방향 인터랙션으로 동작하는 월드 콜리전을 지원합니다.

• 레벨의 메시와 피직스 바디를 충돌체로 사용할 수 있습니다.

• 시뮬레이션 및 재생 동안 프롭, 바닥 및 환경과의 컨택트를 제어할 수 있습니다.

컨트롤 릭 디펜던시 뷰

전용 디펜던시 뷰를 통해 릭 엘리먼트가 시간이 경과함에 따라 어떻게 연결되고 업데이트되는지 확인할 수 있습니다. 컨트롤, 본 및 모듈 간의 관계를 시각화하여 디버깅을 단순화할 수 있습니다.

• 부모-자손 관계 및 메타데이터 관계를 한눈에 확인할 수 있습니다.

• 데이터 플로를 명확하게 파악하면서 릭과 모듈을 디버깅할 수 있습니다.

• 익숙한 형태로 종속성 구조를 시각화합니다.

FBIK 및 리타기팅 퍼포먼스

풀 바디 IK 및 IK 리타기터의 퍼포먼스와 제어 기능이 향상되었습니다. 이를 통해 런타임에서도 높은 퍼포먼스를 유지하며 리타기팅을 수행할 수 있습니다.

• 큰 퍼포먼스 비용 증가 없이 FBIK를 사용한 포즈 처리가 향상되었으며, 속도가 최대 20% 빨라졌습니다.

• IK 릭에서 스트레치 림 솔버를 사용하여 런타임 리타기팅 퍼포먼스를 향상할 수 있습니다.

• FK 회전 모드 로컬 복사를 사용하여 체인별로 회전 전송 속도를 높일 수 있습니다.

• 리타깃 스택에서 퍼포먼스 프로파일링을 지원합니다.

• 리타깃 오퍼레이터별로 LOD 한계치를 추가할 수 있습니다.

향상된 발 접촉 및 비례 리타기팅

발과 지면의 접촉 및 체형 차이가 큰 캐릭터 사이를 보다 잘 처리할 수 있도록 IK 리타기터가 향상되었습니다.

이를 통해 다양한 캐릭터 간 애니메이션 전송 퀄리티가 향상되어 아트 디렉션 작업의 속도를 높일 수 있습니다. 이제 다음과 같은 작업을 모두 수행할 수 있습니다.

• 가랑이 높이를 정의하여 골반이 지면에 닿지 않으면서 상하 움직임을 유지할 수 있습니다.

• 발이 바닥 근처에 있을 때 높이를 유지하도록 바닥 컨스트레인트를 추가할 수 있습니다.

• 본 이동 데이터를 전송하기 위해 FK 트랜슬레이션 모드의 방향 및 스케일을 사용할 수 있습니다.

• 소스 리타깃 체인과 일치시키거나 스케일을 조절하기 위해 스트레치 체인 오퍼레이터를 추가할 수 있습니다.

• 팔다리 스쿼시 및 스트레치를 제어하기 위해 스트레치 림 솔버를 사용할 수 있습니다.

• 모션 캡처 또는 게임플레이 시 소스 스케일의 피벗을 다른 본으로 변경할 수 있습니다.

• 큰 캐릭터에 리타기팅할 때 발생하는 고주파 노이즈를 제거하기 위해 본 필터 오퍼레이터를 추가할 수 있습니다.

공간 인식 리타기팅(실험 단계)

공간 인식 리타기팅은 셀프 콜리전을 신경 쓰지 않고도 서로 다른 캐릭터 간에 애니메이션을 전송할 수 있게 해줍니다.

이 기능을 사용하면 리타기팅한 다음에 애니메이션을 정리할 필요가 줄어듭니다.

• 피직스를 사용하여 IK 목표를 바깥쪽으로 밀어 셀프 콜리전을 방지하는 바디 인터랙션 오퍼레이터가 추가되었습니다.

• 소스와 타깃 간의 접촉 지점 길이에 따라 IK 목표를 이동시키는 상대적 IK 오퍼레이터가 추가되었습니다.

시퀀스 밸리데이터(실험 단계)

시퀀스 밸리데이터은 시네마틱 아티스트가 시퀀스 내의 콘텐츠 오류를 확인할 수 있게 해줍니다. 프로덕션에서 시퀀서 작업 동안 발생할 수 있는 잠재적인 문제를 줄여줍니다.

시퀀스 밸리데이터을 사용하면 다음과 같은 작업을 수행할 수 있습니다.

• 여러 시퀀스와 해당 계층구조를 큐에 등록하여 잠재적인 문제를 확인할 수 있습니다.

• 시퀀스의 섹션이 카메라 컷 또는 재생 범위에서 벗어나 있는지 확인할 수 있습니다.

• 섹션에 할당되지 않은 바인딩 또는 에셋이 있는지 확인할 수 있습니다.

• 섹션이 전체 프레임에서 시작 또는 종료되는지 확인할 수 있습니다.

• 결과를 검토하고 각 시퀀스에서 문제가 있는 위치로 바로 이동할 수 있습니다.

이즈 커브(베타) 및 UX 향상

이제 시퀀서에서도 모션 디자인의 이즈 커브 툴을 사용할 수 있습니다. 이즈 커브 플러그인을 사용하여 이 기능을 활성화할 수 있습니다.

또한 이번 업데이트에서는 보다 일관된 동작을 제공하여 사용성이 향상되었으며 덕분에 반복작업을 더 빠르게 수행할 수 있습니다.

• 이즈 커브 툴을 사용하여 시퀀서, 커브 에디터 및 UMG에서 다양한 이즈 커브 프리셋을 적용하고 저장할 수 있습니다.

• 시퀀서 트리의 스케일 잠금 기능을 이용하여 '디테일(Details)' 패널과 유사한 방식으로 스케일을 조정할 수 있습니다.

• 시퀀스 계층구조의 타임라인 표시가 향상되어 현재 및 부모 시퀀스 시간을 모두 표시할 수 있습니다.

• 트랙 상태(솔로, 뮤트, 비활성화, 잠금, 핀)에 액세스할 수 있도록 블루프린트 및 Python 기능이 확장되었습니다.

• 타임 워프 효과를 포함하도록 트랜스폼 베이킹 기능이 향상되었습니다.

• 내비게이션 툴에 새로운 바인딩 ID 및 시퀀스 ID 열이 추가되었습니다.

이즈 커브 툴은 현재 베타 상태입니다.

데이터리스 뮤터블(실험 단계)

데이터리스 커스터마이저블 오브젝트를 사용하여 반복작업 속도를 높이고 워크플로를 간소화할 수 있습니다. 파라미터 입력이 컴파일 시간이 아닌 런타임에서 처리되어 컴파일 속도가 빨라지고, 암호화 수준이 향상되며, 패키지 크기가 작아집니다.

• 모든 커스터마이저블 오브젝트를 데이터리스로 변환할 수 있습니다.

• 런타임 파라미터 처리를 통해 컴파일 속도를 더 빠르게 할 수 있습니다.

• 다른 언리얼 엔진 에셋과 동일한 방식으로 암호화 및 패키징을 사용할 수 있습니다.

셀렉션 세트

애니메이터는 프로세스 전체에서 여러 선택 항목을 빠르게 액세스할 수 있어야 합니다. 이는 단일 릭에 포함되어 있는 여러 컨트롤일 수도 있고, 다양한 에셋의 컨트롤 또는 트랜스폼일 수도 있습니다. 현재 애니메이터들은 GUI Pickers 같은 커스텀 툴에 의존하여 이 같은 작업을 처리하고 있기 때문에 다른 툴에서 제공하는 인기 있는 플러그인과 같은 네이티브 버전을 구현하기 위해 노력했습니다.

애니메이션 모드 UX 및 편의성

애니메이션 모드가 향상되었습니다.

컨스트레인트, 스페이스 스위칭, 스냅퍼 툴이 이제 새로운 컨스트레인트 창으로 통합되었습니다.

또한 컨스트레인트와 관련하여 생성 프로세스에 몇 가지 새로운 옵션이 추가되었습니다.

• 현재 프레임(Current Frame): 이전의 표준 기능입니다. 현재 프레임에 키를 지정하고 이후 프레임의 모든 키를 보정합니다.

• 시작 프레임에서(From Start)(신규): 현재 프레임의 오프셋을 현재 프레임이 아닌 샷의 첫 프레임에 키를 지정합니다.

• 무한(Infinite)(신규): 키를 추가하지 않습니다. 대신, 현재 프레임의 오프셋을 시퀀스 전체에 적용합니다.

포즈 라이브러리, 트윈 툴, 컨스트레인트, 셀렉션 세트(신규), 애니메이션 레이어가 이제 아이콘 상태에 따라 해당 창의 표시 여부를 토글합니다. 레이아웃 내에서 위치와 크기도 저장됩니다.

이러한 창을 토글하도록 단축키에 할당할 수 있습니다.

메타휴먼

메타휴먼 크리에이터

언리얼 엔진의 메타휴먼 크리에이터를 이제 Linux와 macOS에서도 사용할 수 있게 되어 선호하는 플랫폼에서 강력하고 통합된 디지털 휴먼 제작이 가능해졌습니다. 아직 메타휴먼 크리에이터 웹 애플리케이션에서 마이그레이션하지 않은 경우에는 마이그레이션 가이드에서 기존 메타휴먼 캐릭터를 언리얼 엔진으로 가져와 계속 작업할 수 있는 방법을 확인하세요.

다양한 포즈를 지원하도록 바디 메시 컨포메이션 프로세스를 향상하고, 컨포메이션 템플릿과 모델 메시 간의 UV 공간 버텍스 대응 기능을 추가하여 더 적은 노력으로 보다 정확한 결과를 얻을 수 있습니다. 파라메트릭 바디 컨트롤이 한층 직관적으로 향상되어 인체 비율을 유지하면서 보다 정밀하고 세밀하게 조정할 수 있습니다. 

이번 출시 버전에서는 Python 또는 블루프린트를 사용하여 메타휴먼 캐릭터 에셋의 거의 모든 편집 및 어셈블리 작업을 자동화하고 일괄 처리할 수 있습니다. 이번에 처음으로 스컬프팅, 컨포밍(형상 적용), 의상, 리깅 및 텍스처를 지원하는 API를 통해 메타휴먼 크리에이터를 프로덕션 파이프라인과 크리에이티브 워크플로에 한층 긴밀하게 통합하여 전체 캐릭터 어셈블리를 효율화할 수 있게 되었습니다. 메타휴먼 크리에이터에서 편집 내용을 실시간으로 미리 보고, 언리얼 에디터나 컴퓨트 팜에서 인터랙티브 방식으로 실행하거나 오프라인으로 처리할 수 있습니다.

언리얼 엔진과 메타휴먼의 통합

언리얼 엔진 그룸 플러그인은 이제 조인트 기반 워크플로를 통해 헤어 스트랜드를 셰이핑하고 애니메이팅하는 작업을 더욱 세밀하게 제어할 수 있습니다. 이제 시뮬레이션과 아트 디렉션 기반 모션을 블렌딩하고, 스켈레탈 메시 애니메이션 워크플로를 완벽하게 활용하며, 향상된 셀렉션 세트와 페인트 툴을 통해 아티스트가 보다 자유롭게 창의성을 발휘할 수 있습니다. 이 툴세트는 Houdini에서 생성된 메타휴먼 그룸과 완벽하게 호환됩니다.

메타휴먼 애니메이터

이제 메타휴먼 라이브 링크 소스의 리얼타임 애니메이션 데이터를 블루프린트 인터페이스를 통해 액세스할 수 있으며, 예시 그래프는 문서에서 확인할 수 있습니다.

스테레오 카메라 쌍으로 촬영한 체커보드 테이크에서 캘리브레이션 데이터를 생성하는 워크플로가 향상되어 자동으로 프레임을 선택하는 기능 또한 향상되었으며, 수동으로 프레임을 선택하는 작업을 도와주는 시각화 기능도 향상되었고 여러 테이크 간에 일관되게 환경설정을 적용할 수 있게 되었습니다.

새로운 메타휴먼 애니메이터 캘리브레이션 다이애그노스틱 플러그인(실험 단계)을 함께 사용하면 퍼포먼스 영상과 비교하며 캘리브레이션 결과를 검증할 수 있게 되어 가장 적합한 캘리브레이션을 사용하고 있는지 손쉽게 판단할 수 있습니다.

메타휴먼 캡처

지원되는 카메라의 범위를 확대하여 라이브 링크 페이스 iOS 및 Android 애플리케이션의 리얼타임 애니메이션 옵션이 늘어났습니다.

이제 라이브 링크 페이스를 사용하여 지원되는 Android 디바이스 또는 iPad에서 외장형 카메라를 통해 리얼타임 페이셜 애니메이션을 생성할 수 있습니다. 참고로, 현재 Apple iOS는 외장형 카메라를 지원하지 않습니다. 외장형 카메라에서 비디오를 녹화하는 기능은 iPad에서만 지원됩니다.

라이브 링크 페이스를 사용하면 iOS와 Android에서 온디바이스 카메라를 선택하여 실시간으로 애니메이션을 생성할 수도 있습니다. 온디바이스 카메라에서 비디오를 녹화하는 기능은 iOS에서만 지원됩니다.

Houdini용 메타휴먼

최신 Houdini용 메타휴먼 업데이트에는 사전 제작된 데이터를 활용하여 헤어스타일을 생성하는 가이드 기반 워크플로와 파라메트릭 그룸 툴이 포함되어 있습니다. 이 툴세트에는 헤어라인 주변의 밀도와 위치를 제어하기 위한 폴리클 제너레이터가 포함되어 있으며 흐름, 길이, 볼륨 파라미터에 따라 가이드를 생성하고, 군집도 등 고급 디테일을 위한 헤어 스트랜드 보간 및 스타일링 기능을 제공합니다. 따라서 이 툴세트를 사용하면 새로운 헤어스타일을 빠르고 손쉽게 구성하고 반복작업할 수 있습니다.  

한편 이보다 한층 고급스러운 헤어스타일을 제작해야 하는 경우에는 팹에 새롭게 퍼블리싱된 Houdini용 메타휴먼 그룸 고급 키트(Metahuman Grooom Advanced Kit)를 추가 학습 리소스로 활용할 수 있습니다.

이제 Houdini용 메타휴먼을 Linux에서 사용할 수 있습니다.  

Maya용 메타휴먼

Maya용 메타휴먼 최신 업데이트를 Linux에서 사용할 수 있으며, Maya 2026을 지원합니다.

월드 제작

커스텀 HLOD

기존의 자동 HLOD 생성 방법을 사용하더라도 출력 결과가 항상 프로젝트 요구 사항을 충족하는 것은 아니며, 또 메시 컴포넌트의 영향을 받습니다.

커스텀 HLOD 기능은 개별 액터 또는 액터 그룹에 대해 커스텀 HLOD 표현을 직접 지정할 수 있도록 하여 이러한 제한을 해결합니다.

새로운 월드 파티션 커스텀 HLOD 액터 클래스는 다음과 같은 두 가지 방법으로 사용할 수 있습니다.

• 커스텀 표현 직접 삽입: 커스텀 HLOD 표현을 HLOD 런타임 파티션에 그대로 삽입하고, 필요 시 부모 HLOD 레이어의 입력으로도 사용할 수 있습니다.

• 커스텀 소스만 제공: 커스텀 표현을 HLOD 생성 프로세스의 입력으로만 사용하고 실제 월드에는 추가하지 않습니다.

HLOD 구성 UX

HLOD 구성 생성 또는 편집 시 사용성을 향상하기 위해 월드 세팅(World Settings) > 월드 파티션(World Partition)의 HLOD 레이어 환경설정 및 레이어 에셋을 개편했습니다.

프로시저럴 콘텐츠 제너레이션(PCG)

PCG 프레임워크 정식 버전 전환

언리얼 엔진 5.7 출시 버전과 함께 프로시저럴 콘텐츠 제너레이션(Procedural Content Generation, PCG) 프레임워크가 정식 버전으로 전환되었습니다.

PCG 프레임워크는 지속적으로 개발 및 발전하고 있지만, 저희는 모든 프로덕션이 런타임과 에디터 환경 모두에서 빠르고 반복적인 프로시저럴 콘텐츠 제너레이션 툴세트를 제작하고 활용할 수 있도록 안정적인 환경을 제공하는 데 주력하고 있습니다.

PCG 에디터 모드

언리얼 엔진에서 새로운 PCG 전용 에디터 툴 모드를 사용할 수 있습니다. 이 모드는 PCG 프레임워크를 기반으로 하는 스플라인 그리기, 페인트 또는 볼륨 생성 같은 커스터마이징 가능한 툴 라이브러리를 제공하며, 각 툴에는 관련 PCG 그래프와 실시간 편집에 사용할 수 있는 파라미터가 포함되어 있습니다.

제공된 툴별 PCG 그래프는 그대로 사용할 수도 있고, 예제로 활용하여 필요에 맞게 라이브러리를 생성하거나 확장할 수도 있습니다.

프로시저럴 베지테이션 에디터

프로시저럴 베지테이션 에디터(Procedural Vegetation Editor)는 언리얼 엔진 내에서 나나이트 폴리지를 지원하는 식생 메시를 직접 생성하고 편집할 수 있는 새로운 실험 단계 플러그인입니다.

이번 초기 출시 버전에서는 생성한 프로시저럴 식생 에셋을 PCG 기반 노드 그래프 에디터인 베지테이션 에디터(Vegetation Editor)를 통해 편집할 수 있습니다. 플러그인의 콘텐츠 폴더에 포함된 임포터 노드와 스켈레탈 프리셋을 사용하여 다음과 같은 작업을 수행할 수 있습니다.

• Gravity, Carve, Scale 연산자를 사용하여 나무의 셰이프를 수정할 수 있습니다.

• 잎과 가지의 분포를 조정할 수 있습니다.

• 서로 다른 잎 모델을 할당할 수 있습니다.

• 나나이트 폴리지 어셈블리를 포함하여 스켈레탈 메시 또는 스태틱 메시로 익스포트할 수 있습니다.

하나의 노드 그래프 또는 여러 노드 그래프를 통해 다양한 베리언트를 생성하여 자체 프로젝트를 위한 고유 식생 메시 라이브러리를 제작할 수 있습니다.

에셋 워크플로

이제 PCG 그래프를 단독으로 실행할 수 있으며, 월드 컨텍스트 또는 PCG 컴포넌트에서 그래프를 생성할 필요가 없습니다.

이 같은 변경사항으로 인해 다음이 지원됩니다.

• 지오메트리 오퍼레이션을 사용한 메시 생성, GPU 오퍼레이션을 통한 텍스처 생성 또는 어트리뷰트 세트 테이블 같은 PCG 데이터 에셋 생성 등의 에셋 생성 워크플로를 PCG 그래프 단독 실행만으로 지원합니다.

• 새로운 프로시저럴 베지테이션 에디터 같은 PCG 프레임워크 코어를 기반으로 제작된 에셋 생성 툴 및 플러그인은 프레임워크의 전체 기능 세트와 향후 업데이트를 모두 활용할 수 있습니다.

PCG 그래프의 단독 실행을 활성화하려면 각 그래프의 세팅에서 단독 실행 그래프 여부(Is Standalone Graph)라는 새로운 옵션을 사용하면 됩니다. 이 옵션을 활성화하면 우클릭 메뉴에서 단독 실행 그래프 생성(Generate Standalone Graph(s)) 기능을 액세스할 수 있으며, 그래프 에디터 내에서 독립형 그래프 디버그 오브젝트를 통해 그래프를 생성, 검사 및 디버깅할 수도 있습니다.

커스텀 데이터 타입

초기 출시 버전 이후 PCG 프레임워크의 지원 데이터 타입 목록이 하드 코딩되었기 때문에 프레임워크를 확장하거나 외부 플러그인과 연동할 때 새로운 데이터 타입을 손쉽게 추가하거나 지원하기 어려웠습니다.

언리얼 엔진 5.7에서는 타입 계층구조 내에서 임의의 커스텀 데이터 타입 지원을 추가할 수 있으며, 프레임워크를 확장하거나 프레임워크 코어와 기능 세트를 활용하여 자체 툴을 제작할 수 있습니다.

타입 셀렉터도 업그레이드되어 타입 간의 관계를 보다 명확하게 표시할 수 있으며 다중 선택도 지원합니다.

폴리곤 2D 데이터 타입 및 오퍼레이터

PCG 프레임워크에서 지원하는 데이터 타입 목록에 새로운 폴리곤 2D 데이터 타입이 추가되었습니다.

폴리곤 2D 데이터는 영역을 닫힌 셰이프로 표현할 수 있고 샘플링이나 특정 오퍼레이션을 위해 이를 표면 또는 스플라인 데이터로 변환할 수 있기 때문에 유용합니다.

이 새로운 데이터 타입을 지원하기 위해 다양하고 새로운 오퍼레이터가 추가되었습니다.

• Create Polygon 2D: 입력 포인트 또는 스플라인 데이터를 폴리곤 2D로 변환합니다.

• Polygon Operations: 교집합, 합집합 및 차집합 등 폴리곤 간 오퍼레이션을 수행할 수 있습니다. 또한 스플라인을 패스로 사용하여 폴리곤 2D를 자르고 셰이프를 나누거나 단독 표시할 수 있습니다. 예를 들어 도시 제너레이터 그래프에서 스플라인 데이터를 그리드 패턴으로 사용하여 큰 영역을 잘라 개별 도시 블록을 생성할 수 있습니다.

• Clip Paths: 스플라인과 폴리곤 2D 셰이프의 교집합 또는 차집합을 구할 수 있습니다.

• Offset Polygon: 폴리곤 2D에 오프셋을 적용하여 크기를 늘리거나 줄이고 오버랩을 올바르게 처리합니다.

• Create Surface From Polygon2D: 폴리곤 2D를 표면으로 변환하여 Surface Sampler 노드를 통해 영역 전체에 포인트를 생성할 수 있습니다.

GPU 패스트 지오 인터롭

PCG GPU는 이제 패스트지오메트리 컴포넌트를 활용하므로 프레임워크를 사용하여 지면에 뿌려진 오브젝트나 풀처럼 고밀도 스태틱 메시를 생성하고 스폰할 때 게임 스레드 퍼포먼스를 한층 향상합니다. 이 기능은 별도의 파티션 액터가 필요하지 않으며, 로컬 PCG 컴포넌트를 실시간(on the fly)으로 생성합니다.

이 향상된 개선점을 활용하려면 프로젝트에서 PCG 패스트지오 인터롭 플러그인을 활성화하고 CVAR pcg.RuntimeGeneration.ISM.ComponentlessPrimitives를 1로 설정하세요.

GPU 오퍼레이터 및 향상점

PCG 프레임워크의 GPU 연산 기능 세트에 새 항목이 추가되었습니다.

• Scene Capture: 컴포넌트 원점에서 씬 캡처를 수행하여 스캐터링을 위한 씬 컬러 또는 뎁스 데이터를 구하고 샘플링하는 새로운 노드입니다.

• Save Texture to Asset: PCGTextureData를 UTexture2D 에셋에 베이킹하는 새로운 노드입니다.

• 오버라이드 지원: 이제 GPU 노드에서 파라미터 오버라이드가 지원되며, 커스텀 HLSL 노드에서 사용되는 엘리먼트 수도 포함됩니다.

기존 네이티브 오퍼레이터가 다음과 같은 GPU 연산 지원과 함께 업데이트되었습니다.

• Cull Points Outside Actor Bounds

• Transform Points

UX 향상

PCG 작업에 도움이 되도록 지속적으로 UX를 향상하고 있습니다. 최신 변경사항은 다음과 같습니다.

• 파라미터 및 오버라이드의 타입 컬러 지정 및 유효성 검사: 파라미터, 오버라이드 핀, 상수 출력 핀 및 해당 연결선 전부가 블루프린트 타입 컬러와 시각적으로 일치하도록 자신의 타입에 기반하여 컬러가 지정됩니다. 입력 타입이 지정되지 않았거나 어떤 타입이든 허용되는 경우에는 핀과 연결선의 표시 컬러가 흰색으로 표시됩니다.

• 파라미터 최솟값, 최댓값, 유닛 값: 그래프 파라미터에 표시할 최솟값/최댓값과 유닛 값을 환경설정할 수 있습니다.

• 데이터 뷰포트 컨트롤: 특정 컨텍스트에서 데이터를 미리 보기 위한 그래프 에디터 데이터 뷰포트 컨트롤과 옵션이 추가되었습니다.

노드 및 연산자

언리얼 엔진 5.7에는 다음과 같은 다양한 네이티브 PCG 엘리먼트와 새로운 옵션이 추가되었습니다.

• Spline Intersection: 3D 공간에서 교차하는 스플라인을 찾아 교차점에 제어 포인트를 추가하거나 교차 포인트를 반환합니다.

• Split Splines: 알파, 거리, 키, 컨트롤 포인트 조건에 따라 스플라인을 여러 개로 분할합니다.

• Get Segment: 포인트, 스플라인 및 폴리곤 2D에서 세그먼트 인덱스 포인트 또는 스플라인을 반환합니다.

• Spawn Spline Mesh 컴포넌트 오버라이드: 이제 스플라인 메시를 스폰할 때 컴포넌트 클래스가 올바르게 반영되며, Spawn Spline Mesh 노드에서 컴포넌트 프로퍼티 오버라이드도 지원됩니다.

• 새로운 PCG 블루프린트 엘리먼트 클래스: 5.6 버전의 네이티브 노드에서 도입된 배열 구조체 포맷 변경사항을 지원하기 위해 범위 기반 오버라이드 가능 함수를 포함하는 새로운 PCG 엘리먼트 클래스가 추가되었습니다. 새로운 엘리먼트를 사용하면 불필요한 데이터 트랜스포메이션을 방지하고, BP PCG 엘리먼트로 작업할 때 퍼포먼스가 향상됩니다.

• Get Execution Context: 리슨 서버 여부, 권한 보유 여부, 빌더 여부 컨텍스트 지원이 업데이트되었습니다.

• Extract Attribute: 지정된 인덱스의 특정 어트리뷰트를 얻고 새로운 어트리뷰트 세트로 출력합니다.

• Export Selected Attributes: 선택된 데이터를 바이너리 또는 JSON 포맷으로 익스포트하여 ML 애플리케이션과 같은 외부 사용 사례에 활용할 수 있습니다.

• Attribute Remap: 이제 커브를 기반으로 제어할 수 있습니다.

• 비트 연산자: Shift Left 및 Shift Right가 추가되었습니다.

• 부울 연산자: NAND, NOR, XNOR, IMPLY, NIMPLY 연산자와 비트에서 부울로의 자동 형변환이 추가되었습니다.

• 수학 연산자: 인덱스 오프셋 조정이나 재정렬에 유용한 새로운 모듈로 연산이 추가되었습니다.

• Bounds from Mesh 및 Points from Mesh: 스켈레탈 메시 지원이 추가되었습니다.

Python 인터롭 플러그인

그래프를 실행하는 동안 Python 스크립트를 실행할 수 있게 해주는 새로운 Execute Python Script 노드를 제공하는 PCG 플러그인이 추가되었습니다. Python 스크립트를 입력으로 직접 제공하거나, 디스크의 파일에서 실행할 수 있습니다. 이때 소프트 오브젝트 경로 어트리뷰트 또는 파라미터를 오버라이드하여 파일 경로를 동적으로 설정할 수 있습니다.

개발자 반복작업

인크리멘탈 쿠킹(베타)

인크리멘탈 쿠킹이 언리얼 엔진 5.7에서 베타 버전으로 전환되었습니다.

인크리멘탈 쿠킹은 전체 쿠킹 시간을 단축하여 타깃 디바이스에서 더 빠르게 반복작업을 수행할 수 있도록 해줍니다. 쿠킹 프로세스는 젠 서버에 저장된 이전 결과물을 통해 에셋의 변경사항을 자동으로 분석하고, 프로젝트 에셋에 새로 추가된 업데이트만 쿠킹합니다. 이 기능은 블루프린트와 월드 파티션 타일을 포함한 모든 네이티브 엔진 에셋에 적용됩니다.

CPP 툴 - MSVC 14.44 지원

언리얼 엔진 5.7에서는 디폴트 Microsoft Visual C++ 컴파일러가 MSVC 14.44로 업데이트되었습니다.

빌드 헬스 트래킹 및 시각화(실험 단계)

호드 분석 툴의 하나로, 프로젝트 체인지리스트 전체에서 빌드 그래프 단계가 예상대로 완료되었는지 또는 오류를 보고하는지를 팀이 모니터링하고 검사할 수 있는 새로운 실험 단계 기능인 빌드 헬스 대시보드를 도입했습니다.

이는 호드에 빌트인 기능을 추가하여 팀이 손쉽게 빌드 실패의 주요 원인을 파악하도록 돕기 위한 저희의 노력의 일환으로, 에이전트 풀의 부하와 반복작업 속도에 영향을 미치는 빌드 퍼포먼스 메트릭을 모니터링할 수 있도록 합니다.

오디오

오디오 인사이트(베타)

오디오 인사이트는 오디오 프로파일링 및 디버깅을 위한 기본 툴입니다. 언리얼 엔진에서 오디오를 사용하는 모든 사용자를 대상으로 합니다. 이번 출시 버전에서는 API와 아키텍처의 안정화 외에도 오디오 인사이트의 베타 버전을 제공합니다. 다음과 같은 핵심 기능이 추가되었습니다.

모니터링

• 데이터를 디스크에 쓰지 않고 실시간 모니터링 세션을 시작할 수 있습니다.

• 사운드 디자이너는 독립형 실행 세션과 에디터 세션 모두에서 프로젝트의 오퍼레이션을 장시간 관찰할 수 있으며, 디스크 공간이 부족해지는 것을 걱정하지 않아도 됩니다.

에디터 지원

• 이제 PIE 외에도 에디터 내 다양한 사용 사례에서 오디오 인사이트를 사용할 수 있습니다.

• 오디오 인사이트가 이제 에디터 내의 모든 오디오 인터랙션에 반응합니다.

스냅샷 및 테일 레코딩

• 요청 시 마지막 라이브 세션 데이터를 최대 32MB까지 디스크에 씁니다.

• 오디오 인사이트는 라이브 세션이 시작되었는지 탐지하고 자동으로 연결할 수 있습니다.

라이브 음량 미터링(UX 디자인)

• 독립형 실행 환경에서 음량 규정 준수를 위한 오디오 미터링 기능을 제공합니다.

스크롤 가능한 이벤트 히스토리

• 사운드 시작과 중지 등의 오디오 이벤트를 타임스탬프와 함께 시간 순서의 텍스트 목록으로 시각화합니다.

• 특정 이벤트를 선택하면 플롯 및 기타 시각화가 해당 데이터의 동일한 타임스탬프로 이동합니다.

메타사운드 노드 컨피규레이션

메타사운드 노드 컨피규레이션은 노드가 입력과 출력을 변경할 수 있도록 하여 메타사운드 시스템에 새로운 표현 레이어를 추가합니다. 노드 컨피규레이션은 메타사운드 에디터의 '디테일(Details)' 패널을 활용하며, 노드 인터페이스를 수정하고, 노드가 오디오를 렌더링할 때 사용할 수 있는 보조 데이터를 시리얼라이즈할 수 있게 해줍니다.

사운드 디자이너와 개발자에게 보다 세밀하고 인터랙티브한 노드를 제작할 수 있게 해줄 뿐 아니라 노드 컨피규레이션은 향상된 UX도 제공합니다. 예를 들어 노드 팔레트를 정리하고, 일반적인 메타사운드 디자인 작업에서 필요한 단계 수를 줄이고, 노드 와이어 재배치에 따른 복잡성을 줄일 수 있습니다.

오디오 자막 플러그인

오디오 자막은 접근성 향상을 위해 필수적이며, 대화 시스템, 폐쇄 자막, 보이스 채팅 등에 사용됩니다. 언리얼 엔진 5.7에서는 다음과 같은 기능이 추가되어 자막 플러그인(Subtitle Plugin)이 한층 향상되었습니다.

• 자막은 이제 5.6에서 도입된 독립 타이밍 지원과 기존 사운드 웨이브뿐 아니라 다른 사운드 베이스 타입에 의해서도 제어될 수 있습니다. 이제 자막은 사운드 큐 또는 메타사운드의 최상위 레벨을 기준으로 타이밍을 설정할 수 있습니다.

• 기본적으로 USoundWave 에셋의 사용자 데이터에 어태치된 자막은 오디오가 시작되고 종료되는 시간에 맞춰 자동으로 재생 및 정지됩니다. 하지만 자막 지속 시간 프로퍼티를 사용하는 사례도 있습니다. 사용자가 사용할 지속 시간을 선택할 수 있도록 열거형이 추가되었습니다.

• 사용자 데이터 에셋에서 이제 다중 자막을 지원합니다. 이제 하나의 SFX에 여러 자막이 연결된 경우, 여러 에셋을 사용하는 대신 모든 자막을 하나의 에셋에 포함할 수 있습니다.

• 이제 UEngine::bSubtitlesEnabled를 사용하여 자막 기능을 글로벌로 활성화하거나 비활성화할 수 있습니다.

오디오 웨이브폼 에디터

사운드 디자이너의 경우 오디오 에셋으로 작업할 때 언리얼 엔진과 외부 툴을 전환하며 사용하는 경우가 많습니다. 언리얼 엔진 5.7에서는 임포트된 사운드 파일의 마커와 루프 구간을 오디오 웨이브폼 에디터에 표시하는 기능이 추가되어 워크플로가 향상되었습니다.

또한 사운드 디자이너가 일반적인 오디오 편집 작업을 언리얼 엔진 내에서 계속할 수 있도록 웨이브 에디터의 기능을 보강하고 작업 편의성을 높이는 다양한 향상점도 함께 도입되었습니다.

포맷/채널 애그노스틱 타입(CAT)

사운드 디자이너는 종종 서로 다른 포맷과 채널 수를 사용하는 메타사운드 노드 간에 다중 채널 오디오 데이터를 전송하고 수신해야 합니다. 언리얼 엔진 5.7에서는 오디오 프로그래머가 채널 애그노스틱 타입(Channel Agnostic Type, CAT)을 사용하여 입력 및 출력 레퍼런스를 포함하는 커스텀 노드를 코딩할 수 있습니다.

• 새로운 오디오 레이트 데이터 타입은 하나의 핀 타입으로 여러 오디오 채널을 지원할 수 있게 해줍니다.

• 노드가 다양한 오디오 채널 포맷의 환경설정을 지원할 수 있게 해줍니다.

• 메타사운드 그래프의 복잡성을 줄여줍니다.

테크 오디오 툴 샘플

테크 오디오 팀의 에디터 유틸리티 활용 경험은 게임 오디오 커뮤니티에 큰 도움이 될 수 있습니다. 테크 오디오 툴의 목적은 UE 오디오 기능에 처음 입문하는 개발자들이 보다 쉽게 적응할 수 있도록 돕고, 대규모 프로젝트 작업에 대한 진입 장벽을 낮추며, 개발자가 자신의 프로젝트에 맞는 전용 툴을 제작할 수 있도록 시작점을 제공하는 것입니다.

• 언리얼 오디오 기술 작업을 돕기 위한 블루프린트 스크립팅 유틸리티, 툴, 그래프 세트로 구성되어 있습니다.

• 테크 오디오 팀은 내부 사용 및 외부 시연을 위해 에디터 유틸리티와 워크플로의 모범 사례를 구현할 계획입니다.

플랫폼

Android 플랫폼 지원

언리얼 엔진 프로젝트를 Android 디바이스에 빌드, 패키징 및 디플로이하는 워크플로가 향상되었습니다.

• Android 15에 16KB 페이지 지원 앱을 디플로이할 수 있습니다.

• macOS에서 SDK 구성을 수동으로 조정하지 않아도 됩니다.

• bDontBundleLibrariesInAPK 세팅이 기본적으로 활성화되어 라이브러리가 외부에 유지됩니다. 이로 인해 패키지 크기 개선과 디플로이 유연성이 향상되었습니다.

모바일 렌더러

언리얼 엔진 5.7 모바일 렌더러에 다양한 향상점 및 새로운 기능이 추가되었습니다.

이제 멀티패스 디퍼드 렌더링 모드를 사용할 수 있으며, 이 모드에서는 컨택트 섀도와 인셋 섀도를 활성화할 수 있습니다.

또한 SSAO, SSR 및 DFAO가 이제 확장성 옵션으로 제공되므로 프로젝트 세팅이나 다시 패키징하지 않고 런타임에서 켜고 끌 수 있습니다.

스테레오 레이어

이제 X축이 카메라를 향할 때 스테레오 레이어 컴포넌트가 표시됩니다. 카메라에서 X축이 멀어질 때 표시되는 레거시 비헤이비어를 활성화하려면 CVar XR``.StereoLayers.UseLegacyFacing true를 사용하세요.

에뮬레이션된 스테레오 레이어가 이제 뎁스를 지원하며, 렌더링 방식이 OpenXR 표준을 준수합니다. 새로운 렌더링을 비활성화하려면 CVar XR``.StereoLayers.RenderEmulatedLayerDepth false를 사용하세요.

OpenXR Application SpaceWarp

Application SpaceWarp는 Meta에서 개발한 최적화 기술로, 적합한 콘텐츠에서 추가적인 연산 퍼포먼스를 확보할 수 있습니다. 언리얼 엔진 5.7에서는 Meta의 XR_FB_space_warp 익스텐션뿐 아니라  XR_EXT_frame_synthesis를 지원하는 OpenXR 런타임도 지원하도록 구현했습니다.   이 기술은 애플리케이션을 절반의 프레임 레이트로 렌더링하도록 강제하고, 나머지 프레임은 업데이트된 헤드 방향 정보를 사용하여 합성함으로써 GPU 로드를 크게 줄여줍니다.

프레임 합성 및 SpaceWarp는 xr.OpenXRFrameSynthesis를 사용하여 제어됩니다. 이 기능은 런타임에서 활성화할 수 있지만 r.Velocity.DirectlyRenderOpenXRMotionVectors=1을 설정해야 합니다.

OpenXR 유저 착용 상태

이제 OpenXR 익스텐션 XR_EXT_user_presence를 지원하는 OpenXR 런타임에서 헤드 마운트 디스플레이를 착용하거나 벗을 때 이벤트를 반환할 수 있습니다. 이전에는 VRNotificationsComponent를 통해 노출되었지만, 새로운 방식은 정확도가 더 높고 여러 런타임 간에 일관되게 작동합니다.

모션 디자인

모션 디자인 정식 버전

여러 고객사에서 모션 디자인을 핵심 워크플로에 구현하기 시작함에 따라 모션 디자인 팀은 고객사의 피드백을 지속적으로 수집하고 툴세트의 추가 퍼포먼스 최적화에 주력할 예정입니다.

모션 디자인을 정식 버전으로 전환하기 위해 다음과 같은 향상이 이루어졌습니다.

• 패키징 지원이 강화되었습니다.

• 텍스트 3D가 리치 텍스트와 마스킹 기능을 지원하도록 리팩터링되었습니다.

• 트랜지션 로직의 안정성이 향상되고, 사용 및 구성이 더 쉬워졌습니다.

• 인터페이스 정리 툴을 추가하고, 일반 UX를 리팩터링하여 원격 제어 기능을 강화하고, 구성 시간을 단축했습니다.

• 고객사의 피드백을 기반으로 씬 스테이트가 업그레이드되었습니다.

• 씬 스테이트와 트랜지션 로직 간의 커뮤니케이션을 생성할 수 있습니다.

• 머티리얼 디자이너의 신뢰성이 확보되었습니다.

텍스트 3D - 리치 텍스트

사전 환경설정된 텍스트나 동적으로 커스터마이징 가능한 텍스트를 통해 텍스트 레이아웃에 다이내믹 에지를 적용할 수 있습니다. 새로운 전용 에셋을 사용하여 텍스트 3D 스타일 세트를 생성하면 프로젝트 전체의 모든 텍스트 3D 액터에서 일관된 환경설정을 적용할 수 있습니다.

이전에는 이러한 레이아웃을 구현하려면 여러 개의 텍스트 3D 액터와 자동 팔로우 모디파이어가 필요했습니다. 언리얼 5.7에서는 이러한 스타일을 인라인으로 편집할 수 있으므로 액터 수를 줄이고 개별 텍스트 섹션을 원격으로 제어할 수도 있습니다.

• 폰트, 컬러 및 크기 조절 할당을 지원합니다.

• 유연한 스타일링 툴을 사용하여 어떤 아트 디렉션에도 대응할 수 있습니다.

• 다이내믹 UI 디자인에 특히 적합합니다.

• 텍스트 라인의 각 구간을 원격 제어에 노출하여 추가적인 커스터마이제이션이 가능해졌습니다.

  • 'Brand New Enriched Text'와 같은 문구를 세 개의 개별 컨트롤러로 분리하면서 각 단어의 스타일을 유지하려고 할 때 유용합니다.

트랜지션 로직 편의성

트랜지션 로직은 브로드캐스트 워크플로에서 핵심적인 요소로, 고객사 피드백을 기반으로 레벨 생성 및 트랜지션 로직 구성 단계를 재검토했습니다. 이제 새 레벨을 생성하고, 이미지 왼쪽 상단에 표시된 것처럼 트랜지션 로직 디폴트 씬 생성(Create Transition Logic Default Scene) 옵션을 활성화하면 위 이미지에 나와 있는 모든 단계를 자동으로 수행할 수 있습니다.

트랜지션 로직 디폴트 씬 생성을 활성화할 때 트랜지션 로직이 자동으로 수행하는 구성 단계는 다음과 같습니다.

• 사전에 라벨이 지정된 In 및 Out 시퀀스를 생성합니다.

• 사전에 라벨이 지정된 레이어 변경 시퀀스를 생성합니다.

  • 시퀀서 옵션 패널에서 새 엔트리로 추가 및 사전 할당된 레이어 변경 시퀀스를 추가로 생성할 수 있습니다.

• 즉시 호환되도록 해당 시퀀스의 세팅이 미리 설정됩니다.

• 디폴트 레이어를 생성하여 즉시 작업을 시작하고 디자인을 테스트할 수 있습니다.

• 모션 디자인 아웃라이너의 null 액터에 트랜지션 로직 서브레이어 모디파이어를 추가하고, 생성된 In 및 Out 시퀀스에 미리 할당합니다.

그 이후에는 생성된 In, Out, Change 시퀀스를 사용하여 실제 콘텐츠를 애니메이팅하면 됩니다.

리모트 컨트롤 UX

디자인 리깅 작업 시 시간을 절약할 수 있도록 다양한 기능이 추가되거나 향상되었습니다.

새로운 컨트롤러

• 카테고리

  • 컨트롤러를 그룹별로 구분하기 위한 카테고리를 추가할 수 있습니다.

  • 컨트롤러를 단일 선택 또는 다중 선택한 다음 카테고리로 드래그할 수 있습니다.

• 스트링 목록

  • 이제 조건부 비헤이비어와 링크할 수 있는 명명된 드롭다운 목록을 생성하여 최종 사용자 경험을 향상할 수 있습니다.

  • 이전에는 '1 = Blue, 2= Red, 3= Yellow'처럼 인티저를 입력해야 했지만, 이제는 드롭다운 엔트리 이름을 Red, Blue, Yellow로 지정할 수 있습니다.

• 이벤트

  • 모션 디자인 시퀀스를 재생하거나, '수정 시(On Modify)' 프로퍼티를 트리거하거나, 브로드캐스트 이벤트를 실행할 수 있는 버튼을 생성할 수 있습니다.

경로 비헤이비어

• 이전에는 각 경로 비헤이비어 엔트리가 하나의 액터만 제어할 수 있었습니다. 이제 '액션(Actions)' 패널 아래에 목록이 추가되어 영향을 미칠 액터를 원하는 만큼 추가할 수 있으며, 여러 경로 비헤이비어를 사용할 필요가 줄어들고, 구성 문제를 보다 손쉽게 해결할 수 있습니다.

• 이전에는 경로 목록의 순서를 변경할 수 없었지만, 이제 왼쪽의 드래그 핸들을 사용하여 필요에 따라 순서를 재정렬할 수 있습니다.

• 이제 경로 프리뷰에서 연결하려는 경로가 유효한지 여부를 녹색 체크 표시로 알려줍니다.

UI 향상

• 왼쪽 프로퍼티 패널에 링크 아이콘이 추가되어, 노출된 프로퍼티가 컨트롤러에 할당되어 있는지 여부를 확인할 수 있습니다.

씬 스테이트

언리얼 엔진 5.7의 씬 스테이트에는 사용자 제어 기능을 크게 향상하는 다양하고 새로운 기능과 UX 향상점이 추가되었습니다.

• 스테이트 머신 정리

  • 드래그 앤 드롭으로 스테이트 머신의 순서를 재정렬할 수 있습니다.

  • 카테고리를 추가할 수 있습니다.

• 프로퍼티 레퍼런스의 일부로 세터 작업이 추가되었습니다.

  • 지원되는 데이터 타입에는 Float, Int, String, Text가 포함됩니다.

    • 각 데이터 타입은 고유한 기능을 가집니다.

• 프로퍼티 함수

  • 스트링 연결

  • Text에서 String으로 변환

  • Name에서 String으로 변환

  • Integer에서 String으로 변환

  • Float에서 String으로 변환

• 액터 스폰 및 티커용 액터 스폰 기능이 추가되었습니다.

데이터 링크

데이터 링크에는 사용자 요청이 많았던 두 가지 주요 업데이트가 추가되었습니다.

• 피드의 값 변경사항을 지속적으로 탐지하여 업데이트를 트리거할 수 있는 푸시 기능이 추가되었습니다.

• 씬 스테이트와의 인터랙션을 통해 스크롤링 티커나 기타 동적인 요소를 제어할 수 있는 기능이 추가되었습니다.

프로덕션 렌더링 파이프라인

머티리얼 파라미터 컬렉션 모디파이어

머티리얼 파라미터 컬렉션은 여러 머티리얼의 다양한 프로퍼티를 동시에 제어할 수 있는 강력한 에셋입니다. 씬 내 창의적인 비주얼 연출과 이펙트는 종종 머티리얼 파라미터 컬렉션에 의해 동적으로 제어됩니다.

머티리얼 파라미터 컬렉션 모디파이어를 사용하면 무비 렌더 그래프 내에서 렌더 레이어별로 파라미터 값을 설정하거나 오버라이드할 수 있습니다. 동일한 레벨과 레벨 시퀀스를 사용하면서도 각 렌더 레이어마다 다른 파라미터 값으로 샷을 렌더링할 수 있습니다. 파라미터를 그래프 변수로 변환하고, 이를 퀵 렌더(Quick Render) 및 무비 렌더 큐(Movie Render Queue) 창에서 오버라이드로 노출할 수도 있습니다.

출력 타입별 번 인

하나의 작업에서 여러 출력 타입을 렌더링하는 기능 덕분에 무비 렌더 그래프는 최종 미디어와 검토용 미디어를 동시에 제공할 수 있습니다. 일반적으로 하나의 작업 내 일부 출력 타입에는 번 인(Burn In)이 필요하지만 모든 출력 타입에 필요한 것은 아닙니다. 이 점을 반영하여, 무비 렌더 그래프는 이제 분기 내 별도 노드를 사용하는 대신 출력 타입별 번 인(Burn In Per-Output Type)을 설정합니다. 예를 들어 EXR 렌더에는 번 인을 포함하지 않고 MP4 렌더에만 번 인을 포함하는 식으로 훨씬 간단하게 설정할 수 있습니다.

파일 네이밍 컨트롤

렌더 출력에 대한 엄격한 네이밍 규칙은 모든 산업에서 효율적인 파이프라인을 구현하기 위한 기본 요소입니다. 이러한 점을 고려하여, 무비 렌더 그래프는 추가 파이프라인 스크립팅 없이도 스튜디오별 네이밍 요구 사항을 기본적으로 지원할 수 있도록 훨씬 더 강력한 파일 네이밍 컨트롤 기능을 제공합니다. 주요 향상점은 다음과 같습니다.

• 시네마틱 어셈블리 툴에서 정의된 커스텀 네이밍 토큰이 모든 이름 필드에서 지원됩니다.

• {renderer_name}(예: 'Deferred') 및 {renderer_sub_name}(예: 'beauty')을 커스터마이징할 수 있으며, 이름이 중복되는 경우는 그래프 전체가 아닌 분기 단위로 해결되어 더 높은 유연성을 제공합니다.

• 이제 번 인이 컴포짓되지 않은 경우, 'beauty' 렌더에 {renderer_name}을 강제로 적용하지 않습니다.

• 필요에 따라 포스트 프로세스 머티리얼 패스는 'beauty' 렌더와 다른 네이밍 규칙을 사용할 수 있습니다.

렌더 레이어별 EXR 메타데이터

EXR 메타데이터는 이제 렌더 레이어별로 키/값 쌍을 안정적으로 구분하고 명명 상충을 방지하는 규칙을 따릅니다. 이 규칙에 따라 언리얼 엔진에서 렌더링된 메타데이터는 Nuke와 같은 포스트 컴포지팅 애플리케이션에서 별도의 파이프라인 툴을 제작하지 않고도 직접 쿼리할 수 있습니다.

콘텐츠 파이프라인

인터체인지를 사용하여 USD 에셋 임포트 커스터마이징(실험 단계)

USD는 3D 산업 전반에 걸쳐 채택률이 증가하고 있는 다용도 씬 디스크립션 파일 포맷입니다.

언리얼 엔진 5.5에서 인터체인지 프레임워크가 지원하는 파일 포맷 목록에 USD가 추가되었습니다. 콘텐츠 크리에이터는 이제 임포트 프로세스를 한층 세밀하게 제어할 수 있으며, FBX 등 다른 포맷에서 이미 제공되던 인터체인지 기능과 마찬가지로 USD 파일 에셋을 임포트할 때도 커스텀 처리 단계를 추가할 수 있습니다.

인터체인지를 통한 USD 지원은 현재 실험 단계이며, 에셋 임포트로 한정됩니다. 언리얼 엔진 5.7에서는 다음과 같은 항목이 새롭게 지원됩니다.

• 그룸

• 돔 라이트(DomeLight_1 스키마가 아닌)

• 오디오(UsdMediaSpatialAudio)

• 포인트 인스턴스

인터체인지를 사용하여 FBX 레벨 임포트

여러 다른 파일 포맷을 엔진에 임포트하는 UI/UX를 통합하기 위해 이제 FBX 레벨 임포트 프로세스가 인터체인지 프레임워크를 통해 제공됩니다. 이 방식은 이제 FBX를 레벨로 임포트하는 기본 방식입니다. CVar를 사용하여 레거시 비헤이비어로 되돌릴 수도 있습니다.

주요 변경사항은 이제 콘텐츠 폴더에서 임포트할 때와 동일한 임포트 대화창을 사용하게 되었다는 점입니다. 에셋이나 액터를 임포트에서 제외하거나, 서로 다른 임포트 옵션 세트를 사용하는 등의 레거시 기능은 이제 커스텀 인터체인지 파이프라인을 통해 동작합니다.

에디터 및 UI 시스템

AI 어시스턴트(실험 단계)

AI 어시스턴트를 사용하면 언리얼 엔진을 벗어나지 않고도 더 빠르게 해답을 얻을 수 있습니다. 에디터에서 전용 패널을 펼치면 브라우저로 전환할 필요 없이 질문을 하고, 코드를 생성하고, 단계별 가이드를 따라갈 수 있습니다.

작업 플로를 유지하면서 시간을 절약할 수 있습니다. 온라인 검색으로 인해 집중이 끊기지 않도록 에디터 내에서 즉시 도움말, 예시 및 문제 해결 팁을 구할 수 있습니다.

다음과 같은 작업을 수행할 수 있습니다.

• 작업을 위한 단계별 지침을 제공할 수 있습니다.

• 현재 작업 컨텍스트에 맞는 가이드와 팁을 직접 구할 수 있습니다.

• 개발 관련 문제를 AI의 도움을 통해 해결할 수 있습니다.

• 코드 예시를 생성하여 워크플로 속도를 높일 수 있습니다.

• 채팅 히스토리를 통해 이전 대화를 참고할 수 있습니다.

• 답변을 복사하여 프로젝트에 붙여 넣을 수 있습니다.

AI 어시스턴트는 이미 UEFN과 개발자 커뮤니티에서 사용 중인 특수하게 트레이닝된 동일한 AI를 기반으로 하며, 언리얼 엔진을 이해하고 더 빠르게 작업할 수 있도록 최적화되어 있습니다.

홈 화면

홈(Home) 화면은 친숙한 시작 화면을 제공하여 언리얼 엔진의 환경에 쉽게 적응할 수 있게 해줍니다. 튜토리얼, 문서, 포럼 등 주요 리소스를 확인할 수 있습니다.

보다 쉽고 체계적인 온보딩 경험을 제공합니다. 이제 빈 에디터 화면 대신 학습 리소스, 새 소식, 지원 페이지로 바로 이동할 수 있는 명확한 내비게이션을 제공하여 확신과 자신감을 가지고 프로젝트를 시작할 수 있습니다.

다음과 같은 작업을 수행할 수 있습니다.

• 최신 소식과 업데이트에 액세스할 수 있습니다.

• 시작하기 리소스로 바로 이동할 수 있습니다.

• 튜토리얼과 문서를 열 수 있습니다.

• 포럼과 출시 노트로 이동할 수 있습니다.

• Chrome 브라우저에서 외부 링크를 실행할 수 있습니다.

• 매번 표시되는 것이 싫은 경우에는 홈 화면을 비활성화할 수 있습니다.

홈 화면은 원스톱 온보딩 허브로서, 언리얼 엔진을 처음 실행하는 순간부터 보다 쉽게 접근할 수 있게 해줍니다.

직교 클리핑 인터랙션

이제 직교 뷰포트를 더 안정적이고 유연하게 제어할 수 있습니다. 이전 버전에서는 클리핑 평면이 제대로 작동하지 않아 씬에서 표시되는 범위를 조정하기 어려웠습니다.

직교 뷰에서 표시되는 항목을 정밀하게 제어할 수 있으므로 필요한 지오메트리에만 집중하기가 더 쉬워졌습니다.

다음과 같은 작업을 수행할 수 있습니다.

• 근거리 및 원거리 클리핑 평면을 보다 정밀하게 조정할 수 있습니다.

• 뷰포트에서 새로운 비주얼 컨트롤을 직접 사용할 수 있습니다.

• 워크플로에 맞게 직교 뷰의 표시 비저빌리티를 커스터마이징할 수 있습니다.

언리얼 엔진 5.7에서 수정된 이번 향상점을 통해 직교 워크플로가 한층 더 실용적이고 예측 가능해졌습니다.

저장 및 삭제 대화창 향상

언리얼 엔진의 저장(Save) 및 삭제(Delete) 대화창이 향상되어 에셋 관리가 더 원활해졌습니다. 일반적인 작업이 이제 의도한 대로 작동하므로 불필요한 클릭과 워크플로 중단이 줄어듭니다.

반복되는 확인 창에 시간을 낭비하지 않고 프로젝트 작업에 더 집중할 수 있습니다.

다음과 같은 작업을 수행할 수 있습니다.

• 이제 에셋 삭제 팝업에서 Enter 키를 사용할 수 있습니다(이전에는 불가능함).

• 이제 여러 에셋을 삭제할 때 마우스로 '수락(Accept)'을 반복 클릭하지 않아도 됩니다.

• 대화창 인터랙션이 보다 일관되고 직관적으로 작동합니다.

언리얼 엔진 5.7에 도입된 이러한 개선 사항들은 오랫동안 불편했던 부분을 해결하여 일상적인 워크플로를 간소화합니다.

창 드래그 인터랙션 향상

에디터 내에서 창을 더 직관적이고 원활하게 드래그할 수 있게 되었습니다. 이전 버전에서는 헤더 바를 클릭하고 드래그하면 전체 레벨 에디터가 전체 화면에서 분리되는 경우가 종종 있었습니다.

이제 오동작으로 인한 불편을 피하고 워크스페이스를 안정적으로 유지할 수 있어 제작에 집중할 수 있습니다.

다음과 같은 작업을 수행할 수 있습니다.

• 이제 전체 레벨 에디터를 분리하지 않고도 창과 패널을 드래그할 수 있습니다.

• 전체 화면 워크플로가 의도치 않게 중단되는 것을 방지합니다.

• 보다 일관적이고 사용자 친화적인 창 인터랙션을 경험할 수 있습니다.

언리얼 엔진 5.7에서 수정된 이번 향상점은 자주 발생하던 불편 사항을 해결하여 창 관리 기능을 한층 안정적으로 만들어 줍니다.

블루프린트 에디터 복제 인터랙션 향상

이제 블루프린트 에디터에서 아이템을 더 원활하고 매끄럽게 복제할 수 있게 되었습니다. 이전 버전에서는 아이템을 복제하면 선택 상태가 해제되어 트리 뷰에서 아이템을 다시 수동으로 선택해야 했습니다.

엘리먼트를 복제할 때 불필요한 클릭이나 재작업 없이 편집 플로를 유지할 수 있습니다.

다음과 같은 작업을 수행할 수 있습니다.

• 선택 상태를 유지한 채 블루프린트 에디터에서 아이템을 복제할 수 있습니다.

• 트리뷰에서 작업할 때 선택 상태가 유지됩니다.

• 여러 아이템을 복제할 때 반복 단계를 줄일 수 있습니다.

언리얼 엔진 5.7에서 수정된 이번 향상점으로 인해 블루프린트 편집이 보다 효율적이고 원활해졌습니다.

지오메트리 인스펙션 뷰포트 모드

언리얼 엔진의 새로운 모델 검사 뷰포트 모드는 사실적인 시각화가 아닌 단순화된 시각화 옵션을 제공합니다. 이러한 모드는 기계적인 모델이나 복잡한 3D 모델을 검사할 때 라이팅 및 섀도를 제거함으로써 사실적인 표현보다 지오메트리 측면의 명확성을 우선시합니다.

• 클레이(Clay)

• 지브라(Zebra)

• 정면(Front Face)/후면(Back Face)

• 랜덤 컬러(Random Color)

유저 에셋 태그

유저 에셋 태그 시스템을 사용하면 에셋에 임의의 태그를 추가할 수 있습니다. 이 시스템은 로컬 즐겨찾기와 프로젝트 전체 태그를 모두 지원하며, 추가 태그 제안 기능으로 확장할 수도 있습니다. 이러한 태그는 나이아가라에서 사용되는 태그 에셋 브라우저 같은 추가 시스템의 기반이 됩니다. 태그를 지정할 에셋을 선택하고 Ctrl+T를 누르거나 컨텍스트 메뉴에서 태그 관리(Manage Tags)를 선택합니다.

태그 에셋 브라우저(나이아가라)

이전 버전에서 개편된 나이아가라 에셋 브라우저가 다시 한번 업데이트되었습니다. 이제 이 기능은 범용성이 강화되어 동일한 브라우저를 채택하려는 다른 에셋 팩토리에서 기반으로 활용할 수 있습니다. 새로운 태그가 지정된 에셋 브라우저 환경설정 에셋을 생성하고 고유 섹션과 태그를 정의하여 확장할 수 있습니다. 이를 통해 프로젝트별로 고유한 섹션과 태그를 가질 수 있으며, 나이아가라 에디터의 프로젝트 세팅에서 메인 환경설정 에셋을 완전히 교체할 수도 있습니다.

새로운 태그 에셋 브라우저 구성 에셋을 사용하도록 기존 나이아가라 시스템과 이미터를 업그레이드하는 데 도움이 필요하면 나이아가라 태그 업그레이드하기를 참조하세요.

프레임워크

스테이트 트리: 리와인드 디버거

스테이트 트리를 위한 새로운 리와인드 디버거 트랙이 추가되어 오너 및 인스턴스 중심의 향상된 디버깅 경험을 리와인드 디버거 내에서 직접 제공합니다. 이 통합 기능은 비헤이비어 로직이 언제, 어떤 방식으로 실행되는지를 게임플레이 및 애니메이션 타임라인과 정렬된 상태에서 보다 심층적으로 파악할 수 있게 해줍니다.

새 트랙에는 컴팩트 트리 뷰가 있는 전용 '디테일' 패널이 포함되어, 중첩된 서브트리와 링크된 에셋 등 복잡한 로직 구성을 시각화하고 탐색하기가 한층 쉬워졌습니다. 이 기능은 규모가 더 크거나 모듈형 스테이트 트리로 작업하는 경우에 사용성을 향상해 줍니다.

이 같은 통합 작업은 한층 통일된 디버깅 워크플로로 전환함을 의미하지만, 기존 스테이트 트리 디버거도 여전히 옵션으로 사용할 수 있습니다. 원하는 경우, 일부 사용 사례에서 레거시 인터페이스를 계속 사용할 수 있습니다.

스테이트 트리 런타임

이번 업데이트에는 스테이트 트리 기반 로직의 정확성과 퍼포먼스를 위한 다양한 런타임 레벨의 향상점이 포함되었습니다.

• 라이브 프로퍼티 바인딩: 이제 노드는 실행하는 동안 출력 프로퍼티를 사용하여 값 업데이트를 바인딩된 출력에 동적으로 푸시할 수 있습니다. 이를 통해 틱 워크플로에서 오래된 데이터 또는 스태틱 데이터 문제를 해결할 수 있습니다.

• 실행 런타임 데이터: 이제 노드는 스테이트 트리 인스턴스의 수명 동안 유지되는 선택적 장기 데이터를 선언할 수 있습니다. 이 기능은 스태틱 글로벌 값에 의존하지 않고 트랜지션 또는 틱 간 실행 상태를 유지하는 데 유용합니다.

• 스태틱 바인딩 메모리 최적화: 이제 델리게이트 디스패처, 리스너, 프로퍼티 레퍼런스가 인스턴스 데이터 외부에 저장되어 노드별 메모리 오버헤드를 줄여줍니다.

다음과 같은 기능도 구현되었지만 기존 데이터와 디폴트 비헤이비어에 영향을 미치지 않도록 기본적으로 비활성화되어 있습니다. 하지만 원하는 경우에는 이러한 기능을 선택적으로 사용할 수 있습니다.

• 스테이트 비헤이비어 재진입: 동일한 스테이트로 다시 진입하여 작업을 재시작할 수 있는 기능이 추가되어 재시작 로직을 보다 쉽게 구현할 수 있습니다.

• 인스턴스 데이터 리팩터링: 조건과 트랜지션이 범위 지정된 인스턴스드 데이터를 사용하도록 변경되어 세션 간 데이터 누수를 방지하고 임시 및 지속적인 사용 패턴을 모두 지원합니다.

매스 디버거

매스 디버거에 직접 통합된 강력하고 새로운 엔티티 검색 시스템이 추가되었으며, 이를 통해 개발자가 매스 엔티티 쿼리를 작성하고 실행할 수 있는 새 UI를 사용할 수 있습니다. 이 인터페이스는 매스의 C++ 쿼리 API를 1:1로 미러링하므로 하드 코딩된 쿼리와 동일한 기준과 요구 사항을 사용하여 엔티티를 정밀하게 필터링할 수 있습니다.

이제 커스텀 쿼리를 생성, 저장, 로드 및 공유할 수 있을 뿐 아니라 결과를 엔티티(Entities) 탭에서 즉시 확인할 수 있습니다. 따라서 개발자는 런타임에서 매스의 상태를 보다 빠르고 효율적으로 검사하고 유효성을 검증할 수 있습니다.

또한 매스 프로세서 및 프래그먼트 쓰기 디버깅 시 더 높은 수준의 제어와 비저빌리티를 제공하도록 중단점 시스템이 대폭 업그레이드되었습니다.

자동 생성된 내비링크 다중 점프 환경설정

자동 내비게이션 링크 생성을 확장하여 내비메시 생성 패스마다 다중 점프 환경설정을 지원하도록 했습니다. 이전에는 단일 점프 환경설정만 사용할 수 있었으며, 이로 인해 다양한 링크 타입을 처리하려면 지나치게 넓은 허용 범위를 설정해야 했습니다(예: 위로 점프, 아래로 점프, 횡단 점프). 또한 생성된 모든 링크가 동일한 영역 클래스와 링크 프록시 클래스를 공유하게 되어 유연성이 제한되었습니다.

이번 업데이트를 통해 여러 개의 개별 환경설정을 정의할 수 있으며, 각 환경설정은 자체 유효성 검사 패스에서 처리됩니다. 이를 통해 보다 구체적이고 의미 있는 제어가 가능합니다. 예를 들어 아래로 점프와 위로 점프를 각각 다른 거리 한계치, 영역 타입, 프록시 비헤이비어로 구분하여 생성할 수 있습니다. 이를 통해 과도한 생성 또는 의도치 않은 오버랩을 줄이면서 보다 정교하게 무브먼트를 구성할 수 있습니다.

이전 버전과의 호환성을 보장하기 위해 기존 단일 점프 환경설정은 새로운 다중 환경설정 구성의 첫 번째 엔트리로 마이그레이션되었습니다.

명확성 및 사용성 향상을 위한 여러 편의성 업그레이드를 통해 스테이트 트리 에디터 경험을 지속적으로 향상하고 있습니다.

• 이제 서로 다른 스테이트 트리 에셋 간에도 상태 간의 작업, 조건, 트랜지션을 복사하고 붙여 넣을 수 있습니다. 이로써 방대한 비헤이비어 전체에서 로직을 재사용하고 일관된 비헤이비어를 유지하기가 훨씬 쉬워집니다.

• 개별 프로퍼티 바인딩을 복사하고 붙여 넣는 기능도 추가되었습니다. 바인딩된 프로퍼티와 바인딩되지 않은 프로퍼티가 지능적으로 처리됩니다.

  • 바인딩된 프로퍼티는 호환 가능한 경우 기존 바인딩을 대체합니다.

  • 바인딩되지 않은 프로퍼티는 값을 붙여 넣을 때 해당 값을 가져오고, 호환되는 바인딩을 붙여 넣을 때 해당 바인딩을 적용합니다.

  • 바인딩된 프로퍼티에 값을 붙여 넣는 기능은 비활성화되어 있습니다.

  • 호환되지 않는 타입을 붙여 넣거나 소스 데이터를 사용할 수 없는 경우 유효성 검사 오류가 트리거됩니다.

• 스키마를 기반으로 노드 및 인스턴스 데이터 내 프로퍼티를 숨겨 비주얼 노이즈를 줄이고 집중도를 높일 수 있습니다.

매스 런타임

이번 업데이트에는 리얼타임 시나리오에서 전반적인 퍼포먼스, 메모리 효율성, 시스템 안정성을 향상하기 위한 매스 프레임워크의 로우 레벨 최적화 및 구조적 향상점이 다수 포함되었습니다.

가장 주목할 만한 추가 기능은 프로세서 타임 슬라이싱으로, 장시간 실행되는 프로세서를 여러 프레임에 걸쳐 분할할 수 있습니다. 이는 퍼포먼스 급증을 감소시키고 무거운 워크로드를 더 고르게 분산할 수 있게 해줍니다. 특히, 대규모 환경이나 시뮬레이션 중심 환경에서 유용합니다.

아이리스(베타)

아이리스가 실험 단계에서 베타 단계로 전환됨에 따라 핵심 API를 안정화하고 네트워킹 스택 전체의 사용성, 유지보수성, 퍼포먼스를 향상하는 데 중점을 두었습니다. 이번 출시 버전에는 아이리스 리플리케이션 시스템을 직접 사용하는 개발자를 위한 여러 내부 디자인 변경사항과 편의성 향상점이 포함되어 있습니다.

• 액터 팩토리 오버라이드: 이제 액터는 StartReplicationParams를 사용하여 커스텀 NetActorFactory 구현을 지정할 수 있으며, 런타임에서 리플리케이션 비헤이비어에 더 높은 유연성을 제공합니다. 이제 글로벌 오버라이드에 의존하지 않고 고급 리플리케이션 구성을 지원할 수 있습니다.

• 보다 명료한 API 바운더리: 가상 호출 오버헤드를 줄이고 코드 내비게이션을 단순화하도록 아이리스의 UReplicationBridge 베이스 클래스를 제거했습니다. 대부분의 아이리스 시스템은 이미 UObjectReplicationBridge에 직접 의존하므로, 이번 변경사항으로 인해 상속 모델이 간소화되고 불필요한 인디렉션이 제거되었습니다.

• 리플리케이션 라이프사이클 네이밍 향상: BeginReplication API가 명확해졌습니다.

  • 비가상 함수 이름이 이제 StartActorReplication으로 변경되어 리플리케이션이 시작되는 엔트리 포인트라는 사실을 명확하게 알 수 있습니다.

  • 가상 콜백 함수 이름을 OnBeginReplication으로 변경하여 라이프사이클 비헤이비어와 시스템 호출을 분리했습니다.

• 아이리스와 레거시 네트워킹 시스템 간의 일관성 강화: 이제 아이리스가 활성화되어 있지 않아도 OnBeginReplication 및 EndReplication이 항상 호출되므로 비헤이비어 일관성이 보장되고 네트워킹 시스템 간 트랜지션이 한층 원활해졌습니다.

• 심리스 트래블 지원: 이제 아이리스가 언리얼 엔진의 심리스 트래블 기능을 지원하여, 월드 트랜지션에 걸쳐 리플리케이트된 액터와 상태가 올바르게 처리되도록 보장합니다. 이는 지속적인 플레이어 데이터나 대규모 스트리밍 월드 간 트랜지션에 의존하는 게임 피처를 출시하기 위한 핵심 요구 사항입니다.

미디어

미디어 뷰어(베타)

애니메이터는 종종 기존의 레퍼런스 영상과 자신의 애니메이션을 나란히 비교해야 하는 경우가 있습니다. 5.6에서는 애니메이션 작업이 이루어지는 위치 옆에 이미지, 미디어 텍스처, 비디오 파일, 라이브 뷰포트 등의 미디어를 도킹할 수 있는 기능이 추가되었습니다. 수평 또는 수직으로 환경설정된 두 개의 A/B 비교 뷰를 사용하여 두 에셋 세트를 비교할 수 있습니다. 또한 확대 및 이동 기능을 활용해 콘텐츠를 보다 정밀하게 맞출 수 있습니다. 언리얼 엔진 5.7에서 미디어 뷰어 플러그인이 이제 베타 버전으로 전환되었으며, 다음과 같은 워크플로 및 사용성 향상점이 포함되었습니다.

• ALT+RMB를 사용하는 회전 및 줌 컨트롤이 향상되었습니다.

• 단축키를 사용하여 에셋 환경설정에 북마크를 지정하고 빠르게 불러올 수 있는 기능이 추가되었습니다.

• 이제 듀얼 플레이어 모드에서도 잠금 버튼이 재생 컨트롤과 타임라인에 함께 반영됩니다.

시뮬레이션 및 VFX

카오스 디스트럭션

카오스 디스트럭션 시스템은 실시간으로 시네마틱 퀄리티 수준의 디스트럭션을 구현하기 위한 툴세트입니다. 이 시스템은 뛰어난 비주얼을 제공할 뿐 아니라 퍼포먼스에 최적화되어 있으며, 아티스트와 디자이너가 직관적인 비선형 워크플로를 사용하여 콘텐츠 제작 및 프랙처 프로세스를 보다 세밀하게 제어할 수 있게 해줍니다.

언리얼 엔진 5.7 업데이트에는 다음이 포함됩니다.

• 상태 리셋: 이제 시뮬레이션하는 동안에도 C++, 블루프린트 또는 에디터 내에서 지오메트리 컬렉션 컴포넌트의 상태를 리셋할 수 있습니다.

• 스켈레탈 메시로 익스포트: 이제 지오메트리 컬렉션 에셋을 스켈레탈 메시 에셋으로 익스포트할 수 있습니다.

• 리프 서브트레이스: 지오메트리 컬렉션에 트레이스를 수행한 후 이제 라인 트레이스에서 정확히 어떤 리프 원뿔을 히트했는지 구할 수 있습니다. 기존에는 부서지지 상태에서 컴포넌트를 대상으로 한 원래의 라인 트레이스가 루트 본을 반환합니다. 이 새로운 기능을 사용하면 트레이스가 히트한 정확한 본을 구할 수 있습니다. 이를 통해 정확한 본에 데칼을 설정하거나, 런타임에서 개별 조각을 고정하는 등의 작업을 수행할 수 있습니다.

카오스 데이터플로 에디터

데이터플로 그래프는 노드 기반 환경 내에서 에셋을 프로시저럴 방식으로 생성할 수 있도록 지원합니다. 이 그래프 구현은 그래프 노드가 입력을 평가한 결과를 기반으로 캐시된 출력 상태를 생성하는 풀 기반 평가 방식을 사용합니다. 데이터플로 에셋은 시뮬레이션 시스템을 프로시저럴 방식으로 생성 및 설정하는 데 활용됩니다.

카오스 클로스, 디스트럭션, 플레시 및 헤어는 통합 데이터플로 노드 기반 툴세트를 사용합니다.

언리얼 엔진 5.7 업데이트에는 다음이 포함됩니다.

• 새로운 타임라인 및 시뮬레이션 컨트롤이 추가되었습니다.

• 새로운 툴바가 추가되었습니다.

• 스켈레탈 메시 에디터에 맞게 다시 디자인된 페인트 웨이트 맵 툴이 추가되었습니다.

• 스켈레탈 메시 에디터에 맞게 새로운 스킨 웨이트 편집 툴이 추가되었습니다.

• 새로운 스켈레톤 본 편집 툴이 추가되었습니다.

• 다양한 편의성 향상점이 포함되었습니다.

카오스 비주얼 디버거

카오스 비주얼 디버거(Chaos Visual Debugger, CVD)는 게임플레이 동안 피직스 시뮬레이션의 상태를 녹화하고 재생할 수 있도록 디자인된 다용도 툴입니다. 이 툴은 파티클 상태 및 콜리전 데이터를 포함하여 모든 활성 리지드 및 RBAN 솔버의 기록을 지원합니다. CVD는 언리얼 엔진에서 에디터 툴로 사용할 수 있으며, UI 또는 콘솔 명령을 사용하여 녹화할 데이터 채널을 선택하는 등 다양한 커스터마이제이션 옵션을 제공합니다.

또한 이 툴에는 시뮬레이션 동안 피직스 데이터를 실시간으로 확인할 수 있는 라이브 디버깅 기능도 포함되어 있습니다. 더불어 파티클 상태, 콜리전 데이터, 씬 쿼리 등 다양한 시각화 옵션을 통해 개발자가 피직스 시뮬레이션을 효과적으로 분석하고 문제를 해결할 수 있도록 지원합니다.

언리얼 엔진 5.7 업데이트에는 다음이 포함됩니다.

• 오브젝트 이름 향상: 이번 출시 버전에서는 파티클 메타데이터라는 새로운 기능이 도입되었습니다.

  • 이 새로운 메타데이터는 기존의 긴 '디버그 이름' 스트링을 대체합니다.

  • CVD는 이제 피직스 바디를 소유한 액터의 이름을 표시하고 이를 레벨, 컴포넌트, 본 인덱스 등의 개별 필드로 구분해 보여줍니다.

  • 또한 새 메타데이터를 활용하여 특정 바디가 속한 블루프린트를 한 번의 클릭으로 찾을 수 있는 콘텐츠 브라우저에서 찾기(Find in Content Browser) 버튼이 도입되었습니다.

• 퍼포먼스 향상: 이번 출시 버전에서도 CVD의 퍼포먼스 향상을 지속적으로 진행했습니다.

  • 콜리전 지오메트리 데이터가 2GB 이상 포함된 CVD 파일은 이제 최대 30% 더 빠르게 로드됩니다.

  • 93,000개 이상의 오브젝트가 포함된 복잡한 씬의 첫 프레임을 로드할 때 발생할 수 있었던 약 10초의 스톨 현상이 약 3초로 줄었습니다.

• 이번 출시 버전에는 버그 수정 및 편의성 향상점도 포함되어 있습니다.

카오스 클로스

언리얼 엔진에서 클로스 시뮬레이션과 복잡한 클로딩에 대한 수요가 증가함에 따라, 레거시 스켈레탈 메시 기반 클로스 에디터와 워크플로는 향후 필요한 업그레이드에 유연하게 대응하기 어렵게 되었습니다. 패션 및 대부분의 캐릭터 제작 작업은 패널 기반 클로딩 생성에 특화된 DCC 툴로 거의 완전히 전환되었습니다. 언리얼 엔진은 이러한 외부 DCC 툴과 함께 발전하기 위해 패널 구성을 수집하여 편집할 수 있는 클로스 에디터를 지속적으로 개발하고 있으며, 전반적인 클로스 구성 워크플로도 함께 향상하고 있습니다.

언리얼 엔진 5.7용 카오스 클로스에는 지속적으로 개발 중인 베타 단계의 클로스 에디터가 포함되어 있습니다. 

언리얼 엔진 5.7 업데이트에는 다음이 포함됩니다.

• 스켈레탈 메시 클로딩 데이터 통합:

  • 이제 클로스 에셋과 의상 에셋을 스켈레탈 메시의 클로딩 데이터로 추가할 수 있습니다.

  • 이후 스켈레탈 메시의 렌더 섹션은 해당 에셋의 데이터플로 그래프 내 클로스 시뮬레이션 설정에 의해 디폼될 수 있으며, 별도의 클로스 컴포넌트를 추가할 필요가 없습니다.

• 새로운 레퍼런스 스페이스 옵션:

  • 자동 계산된 ReferenceBone을 사용하는 대신 새로운 ReferenceBone 데이터플로 노드를 사용하여 ReferenceBone을 명시적으로 설정할 수 있습니다.

  • 새로운 로컬 감쇠 스페이스 옵션을 사용하여 기존의 질량 중심 대신 ReferenceBone 스페이스에서 시뮬레이션할 수 있습니다.

• 최적화: 클로스 게임 스레드와 인터랙터 틱이 최적화되었습니다.

• 액세서리 메시(실험 단계):

  • 새로운 액세서리 메시가 추가되었으며, 이 액세서리 메시를 사용할 수 있도록 백스탑 컨스트레인트가 업데이트되었습니다.

  • 현재는 기존 시뮬레이션 메시 컬렉션을 액세서리 메시로 변환하여 액세서리 메시를 생성할 수 있습니다. 소스와 타깃 컬렉션 모두에 임포트한 버텍스 ID가 있는 경우, SKM 임포트 과정에서 재정렬된 버텍스 인덱스를 ID를 사용하여 일치시킬 수 있습니다.

카오스 코어

카오스 피직스는 아티스트, 개발자, 프로그래머에게 더 나은 시뮬레이션 결과를 제공하기 위해 지속적으로 업데이트 및 최적화되고 있습니다. 리지드 바디 다이내믹스는 대부분의 게임 피직스가 기반으로 삼고 있는 핵심 기술입니다. 점점 더 크고 복잡한 피직스 기반 월드를 구현해 나감에 따라, 코어 시스템이 확장 가능하고 해당 사용 사례를 처리할 수 있도록 준비해야 합니다. 리지드 바디 다이내믹스처럼 쿼리 역시 언리얼 엔진 내 다양한 시스템들이 의존하고 있는 핵심 기술이며, 리지드 바디 다이내믹스와 같이 쿼리 퍼포먼스가 대규모 다이내믹 월드에서도 확장 가능하도록 보장해야 합니다.

언리얼 엔진 5.7 업데이트에는 다음이 포함됩니다.

• 시뮬레이션 퍼포먼스 향상:

  • 더 많은 병렬 시뮬레이션 스테이지가 추가되었습니다.

  • 대규모 비구조적 더미의 퍼포먼스를 향상하기 위해 실험 단계 기능인 부분 슬리핑 기능이 추가되었습니다.

• 쿼리 퍼포먼스 향상:

  • 스피어 및 캡슐의 정밀 검사 성능이 향상되었습니다.

  • 일반 쿼리 레이어 트랜스폼 및 스케일 처리가 향상되었습니다.

• 카오스 비주얼 디버거(CVD):

  • 액터 수가 많고 지오메트리가 복잡한 씬의 로딩 속도가 향상되었습니다.

  • 편의성 및 런타임 디버거 일관성이 향상되었습니다.

• 데이터플로 피직스 에셋:

  • 데이터플로 그래프를 사용하여 피직스 에셋을 생성할 수 있는 초기 지원이 추가되었습니다.

• 시뮬레이션 기능 전체에 걸쳐 다수의 편의성 향상과 수정이 이뤄졌습니다.

카오스 캐시

언리얼 엔진에서 카오스 캐시는 카오스 디스트럭션 프레임워크 내 시스템으로서, 복잡한 디스트럭션 시뮬레이션을 녹화하고 재사용하여 퍼포먼스를 대폭 향상하고, 단편 영화 같은 콘텐츠에서 일관되고 예측 가능한 결과를 제공합니다. 카오스 캐시 매니저를 사용하여 캐싱을 관리하며, 이 매니저는 피직스 데이터를 카오스 캐시 컬렉션 에셋에 녹화합니다.

이렇게 캐시된 데이터는 런타임에서 재생되어 전체 시뮬레이션을 다시 계산하지 않고도 디스트럭션을 표시할 수 있어, 복잡한 씬을 보다 효율적으로 처리하고 하드웨어 부담을 줄여줍니다.

언리얼 엔진 5.7 업데이트에는 다음이 포함됩니다.

• 지오메트리 컬렉션 루트 프록시 메시 지원: 카오스 캐시는 이제 루트 프록시 메시를 올바르게 지원하며, 캐시 및 재생 중인 지오메트리 컬렉션 에셋의 디스트럭션 상태에 따라 자동으로 해당 메시를 전환하여 사용합니다.

• 캐시 에셋 자동 증가: 카오스 캐시 매니저에 이제 새로운 녹화 세션이 시작될 때마다 자동으로 새 에셋을 생성하는 옵션이 추가되었습니다.

• 세션 시작/중지 제어: 이제 캐싱 세션의 시작과 종료 시점을 직접 제어할 수 있습니다. 기본적으로 캐시 세션은 캐시 액터의 Begin Play 이벤트가 트리거될 때 시작되며, 이는 일반적으로 PIE 또는 시뮬레이션을 시작할 때 발생합니다. 이 비헤이비어를 비활성화하는 옵션도 제공되며, 이 경우 블루프린트 함수(start, stop)를 사용하여 세션이 시작되는 것을 직접 트리거해야 합니다.

• 관찰된 컴포넌트 함수: 특정 ChaosActorManager의 관찰된 컴포넌트를 추가, 업데이트, 제거 및 지울 수 있는 블루프린트 함수가 새로 추가되었습니다.

• 주요 버그 수정:

  • 동일한 세션에서 지오메트리 컬렉션을 두 번 녹화할 때, 이제 두 번째 녹화 시에도 이벤트가 올바르게 녹화됩니다.

  • 재생 모드에서 캐시를 재생할 때, 카오스 디스트럭션용 나이아가라 데이터 인터페이스가 이제 의도한 대로 트레일링 이벤트를 항상 트리거합니다.

카오스 헤어

헤어 및 그룸 이니셔티브는 데이터플로, 스켈레탈 메시, 가이드 스플라인을 사용해 사실적인 헤어 비헤이비어를 위한 견고한 시뮬레이션 파이프라인을 구현하는 데 중점을 두고 있습니다. 이 시스템에서 애니메이션 기반 시뮬레이션, 키네마틱 및 시뮬레이션된 스트랜드 간의 블렌딩, 가이드 디포머 및 페인팅 툴과 같은 고급 제작 기능이 지원됩니다.

그룸 에셋의 프로시저럴 워크플로는 데이터플로 에디터 전체에 걸친 향상과 관련된 언리얼 엔진 5.7 업데이트의 이점을 활용할 수 있습니다. 보다 유연하게 구성할 수 있도록 관련 노드가 향상되었습니다.

• 선택 인식 노드:

  • 대부분의 노드가 선택 영역을 인식하므로, 보다 세밀하고 타기팅된 구성이 가능합니다.

  • 디스트럭션, 플레시 등 다른 에셋용으로 제공되는 기존 선택 노드를 사용하여 셀렉션 세트를 생성하고, 이를 프로시저럴하게 조작할 수 있습니다.

• 퍼포먼스:

  • 복잡한 지오메트리를 가진 그룸 에셋은 이제 컨스트럭션 뷰포트용 지오메트리를 더 빠르게 생성하며, 정보를 캐시하여 재계산되는 것을 방지합니다.

  • 이는 다른 데이터플로 에디터 전체의 컬렉션 기반 노드들에도 적용됩니다.

언리얼 엔진 5.7 업데이트에는 다음이 포함됩니다.

• 애니메이션과 피직스로 제어되는 가이드 스플라인을 사용하여 헤어를 시뮬레이션합니다.

• 사실감과 제어력을 높이기 위해 애니메이션 상태와 시뮬레이션 상태를 블렌딩합니다.

• 어트리뷰트 페인팅, 스킨 웨이트 지정, 가이드 교체가 지원됩니다.

카오스 플루이드

플루이드 프로젝트는 언리얼 엔진의 워터 시뮬레이션 기능을 지속적으로 확장하고 있으며, 언리얼 엔진 5.7에서는 주로 고급 워터 플러그인을 향상하고 베이킹된 리버 시뮬레이션을 향상하는 데 중점을 두고 있습니다.

언리얼 엔진 5.7 업데이트에는 다음이 포함됩니다. 

• 이제 버추얼 텍스처를 지원합니다.

• 표면 퀄리티가 향상되어 스파이크 아티팩트가 감소했습니다.

• 다양한 버그 수정 및 성능 향상이 포함되었습니다.

버추얼 프로덕션

라이브 링크 - 데이터 프리뷰

이제 별도의 액터나 스켈레탈 메시를 준비하지 않고도 에디터 뷰포트에서 라이브 링크 데이터를 미리 볼 수 있습니다. 라이브 링크 데이터 프리뷰 액터는 애니메이션, 트랜스폼, 카메라 및 마커 역할 데이터를 하나의 간편한 액터에서 시각화합니다.

커스텀 에디터 유틸리티 툴 제작을 위한 액터 컴포넌트도 제공합니다. 모캡 매니저에서도 이제 이러한 기능을 사용하여 라이브 링크 데이터를 시각화합니다.

라이브 링크 허브 - 안정적인 녹화

라이브 링크 허브의 녹화 안정성이 향상되어, 녹화 중에 트래킹 손실 후 다시 복구되는 경우처럼 시간이 경과함에 따라 서브젝트 데이터 크기가 변경되는 상황도 처리할 수 있습니다.

이전 버전의 녹화 파일은 녹화 목록의 우클릭 메뉴 옵션을 사용하여 새 포맷으로 업그레이드할 수 있습니다.

라이브 링크 - 브로드캐스트 컴포넌트

레벨의 액터에 새 라이브 링크 브로드캐스트 컴포넌트를 추가하면 해당 액터를 로컬 네트워크의 다른 머신이 애니메이션을 수신할 수 있는 라이브 링크 서브젝트로 변환할 수 있습니다. 브로드캐스트 컴포넌트는 트랜스폼, 카메라 및 애니메이션 역할을 지원합니다.

이 새 컴포넌트를 사용하면 경량형 언리얼 엔진 프로젝트에서 스켈레탈 리타기팅을 수행한 후 결과 리타깃 포즈를 네트워크의 다른 언리얼 에디터 프로젝트에 브로드캐스트하는 워크플로를 지원하므로 언리얼 엔진을 리타깃 DCC 소프트웨어로 활용할 수 있습니다. 브로드캐스트 애니메이션의 프레임 레이트는 게임 스레드 프레임 레이트와 동일합니다.

라이브 링크 - 일시정지 가능 데이터 스트림

이제 라이브 링크 패널과 라이브 링크 허브에서 라이브 링크 서브젝트의 데이터를 일시정지하거나 다시 재개할 수 있습니다. 서브젝트를 개별적으로 또는 그룹 단위로 일시정지할 수 있습니다.

커스텀 에디터 툴 제작에서 활용 가능한 일시정지를 제어할 수 있는 블루프린트 스크립팅 함수도 제공됩니다. 모캡 매니저는 이제 이 API를 사용하여 서브젝트의 일시정지를 제어합니다.

라이브 링크 허브 - 언리얼 에디터 디바이스

향후 출시 버전에서는 멀티 유저 모션 캡처 구성을 지원하기 위해 스위치보드의 녹화 디바이스 기능이 라이브 링크 허브로 마이그레이션될 예정입니다. 언리얼 엔진 5.7에서는 실험 단계 플러그인인 라이브 링크 언리얼 디바이스를 사용하여 라이브 링크 허브에서 연결된 언리얼 에디터 클라이언트의 테이크 레코더 슬레이트와 녹화 시작/중지를 제어할 수 있습니다.

이 새로운 방식은 스위치보드에서 사용되던 레거시 OSC 메시지 시스템을 대체하며, 다중 클라이언트 테이크 레코딩의 안정성을 향상하고, 각 클라이언트가 어떤 데이터를 녹화할지와 녹화 권한을 사용자 제어 방식으로 설정할 수 있도록 합니다.

모캡 매니저 - 다이내믹 프롭 어태치먼트

모캡 리타기팅 시 퍼포머의 손 위치와 모캡 캐릭터의 손 위치 사이에 오프셋이 발생하는 경우가 적지 않습니다. 이 문제는 트래킹된 프롭을 캐릭터와 정렬하려고 할 때 발생합니다.

새로운 다이내믹 프롭 어태치먼트 컴포넌트는 모션 캡처 데이터를 사용하여 프롭을 제어하면서도, 캐릭터의 손 위치에 맞게 동적으로 오프셋을 추가할 수 있는 기능을 제공합니다.

이제 PCapProp 컴포넌트에 사용자가 직접 다이내믹 어태치먼트 로직을 작성할 수 있는 블루프린트 오버라이드 가능 함수가 제공됩니다. 모캡 매니저에는 대부분의 한 손으로 사용하는 프롭에 적용할 수 있는 예시 구현이 포함되어 있습니다.

모캡 매니저 - 향상된 퍼포머 메시 생성

가장 정확한 리타깃 결과를 얻기 위해 퍼포머의 라이브 링크 데이터 비율에 맞게 스케일 조절된 스켈레탈 메시는 모범 사례로 간주됩니다.

스테이지 원점이 편리한 위치에 있지 않거나, 오른손 좌표계를 사용하는 시스템에서도 이러한 에셋을 생성할 수 있도록 모캡 매니저의 워크플로가 향상되었습니다.

컴포셔

언리얼 엔진 5.7에서는 컴포셔가 실시간 합성을 위한 새로운 시스템으로 재도입되어 라이브 비디오 입력뿐 아니라 파일/이미지 미디어 플레이트를 모두 지원합니다. 새로운 컴포셔는 레이어 기반 툴로서, 레거시 시스템보다 다양한 향상점이 추가되었습니다.

• 새롭게 디자인된 사용자 경험과 간소화된 워크플로

• 커스텀 렌더 패스를 사용하여 실사 영상에 섀도 및 리플렉션을 효율적으로 통합할 수 있음

• 향상된 키어

미디어 프로파일

기존에는 언리얼 엔진에서 라이브 비디오 입출력을 관리하려면 미디어 소스, 미디어 플레이어, 미디어 텍스처 등 여러 에셋을 단계별로 구성해야 했습니다. 미디어 프로파일은 이러한 에셋을 통합하여 특정 머신 구성에 대한 단일 환경설정 에셋으로 관리하고, 다양한 워크플로 향상점을 제공합니다.

• 여러 미디어 소스와 미디어 출력을 동적으로 추가하고 AJA, Blackmagic, NDI와 같은 원하는 하드웨어 옵션을 선택할 수 있습니다.

• 여러 IO 피드를 동시에 미리 볼 수 있습니다.

• 미디어 출력을 캡처할 수 있습니다.

• 타임코드와 젠록을 즉각적인 피드백과 함께 설정할 수 있습니다.

• 컴포셔와 같은 관련 툴에서 단 한 번의 클릭으로 비디오 IO 기능에 간편하게 액세스할 수 있습니다.

테이크 레코더 - 히치 프로텍션(실험 단계)

언리얼 엔진 5.7 업데이트에서는 테이크 녹화 시 히치 방지 지원이 추가되었습니다. 이제 테이크 레코더의 녹화 속도를 늘려 데이터 손실을 방지하도록 환경설정할 수 있습니다. 프레임이 손실될 상황에서도 테이크 레코더가 엔진 평가 타이밍을 조정하여 데이터를 녹화할 시간을 확보한 뒤 정상 속도로 복귀할 수 있습니다.

• 데이터 전체를 보다 안정적으로 녹화합니다.

• 데이터 무결성이 손상될 수 있는 영역을 시각화합니다.

• 녹화 퀄리티에 대해 실시간으로 판단하고 필요한 결정을 내릴 수 있습니다.

네이밍 토큰 - 편집 가능한 텍스트 위젯

네이밍 토큰을 직접 지원하는 새로운 슬레이트 및 UMG 네이밍 토큰 편집 가능 텍스트 위젯이 추가되었습니다. 이제 네이밍 토큰 기능을 지원하는 파이프라인 툴을 손쉽게 제작할 수 있습니다. 텍스트 박스에 포커스가 있는 경우 평가되지 않은 {token} 스트링이 표시됩니다. 커밋하면 텍스트 박스에 평가된 결과 텍스트가 표시됩니다.

• 텍스트 박스에서 직접 {tokens}을(를) 검색하고 자동 완성할 수 있습니다.

• 평가된 토큰 값을 즉시 텍스트 박스에서 직접 확인할 수 있습니다.

이 기능은 네이밍 토큰 플러그인에서 사용할 수 있습니다.

시네마틱 어셈블리 스키마용 타임라인 템플릿

시네마틱 어셈블리 스키마에서 이제 기존 레벨 시퀀스와 시네마틱 어셈블리를 시퀀서 타임라인의 템플릿으로 레퍼런스할 수 있습니다. 스키마를 사용하여 새 시네마틱 어셈블리를 생성할 때마다 지정한 타깃 템플릿을 기반으로 타임라인이 자동으로 재생성됩니다.

• 베이스 타임라인을 미리 디자인할 수 있습니다.

• 샷, 씬, 라이팅 시퀀스 등을 생성할 때 반복작업과 오류를 줄일 수 있습니다.

이 기능은 시네마틱 어셈블리 툴(Cinematic Assembly Tool, CAT) 플러그인을 사용하는 경우에 이용할 수 있습니다.

어셈블리 복제 시 레퍼런스 대체

이제 어셈블리를 새 위치에 복제할 때 레퍼런스를 대체할 수 있습니다. 어셈블리 복제 시 이제 서브시퀀스를 수동으로 생성하거나 이름을 변경하고 다시 레퍼런스하지 않아도 됩니다.

• 어셈블리 메타데이터와 토큰을 기반으로 새 위치에 복제하고 자동으로 이름을 지정합니다.

• 서브시퀀스는 프로시저럴 방식으로 복제, 이름 변경, 레퍼런스 재연결이 수행되므로 누락된 레퍼런스 없이 기존 샷이 새 링크로 자동 업데이트됩니다.

• 깔끔하고 단순한 마법사를 통해 손쉽게 액세스할 수 있습니다.

SMPTE 2110 - Nvidia Rivermax BlueField-3 지원

언리얼 엔진 5.7의 Nvidia Rivermax 플러그인은 BlueField-2 및 BlueField-3 DPU를 모두 지원하며, 인카메라 VFX용 nDisplay에서 기능 검증을 완료했습니다.

플랫폼 SDK 업그레이드

• Windows

  • Visual Studio 2022 v17.4 이상

  • Windows SDK 10.0.22621.0 이상

  • LLVM Clang

    • 최소: 18.1.8

    • 권장: 20.1.8

  • Intel OneAPI

    • 최소: 2025.2.0

    • 권장: 2025.2.0

  • .NET 8.0

• 빌드 팜 컴파일 IDE 버전

  • Visual Studio 2022 17.14 14.44.35207 툴체인 및 Windows 10 SDK(10.0.22621.0)

  • Xcode 15.4

• GDK

  • 최소 Windows SDK: 10.0.22000.0

  • GDK: April 2025

  • 최신 복구 버전

  • 지원되는 IDE: Visual Studio 2022

• Linux

  • 네이티브 Linux 개발

  • 권장 OS: Ubuntu 22.04, Rocky Linux 8 이상, Redhat Linux 8 이상

  • 컴파일러: Clang 20.1.8

  • 크로스 컴파일 툴체인: v26 clang-20.1.8 기반

  • 참고: Linux용 언리얼 엔진 사용자의 경우, SDL3를 사용하려면 OS를 업데이트해야 합니다. 자세한 내용은 Updating Unreal Engine on Linux to SDL3 문서를 참고하세요.

• macOS

  • 권장 OS: 최신 macOS Sonoma 14

  • 최소 OS: macOS Sonoma 14.0

  • 권장 Xcode: 15.4 이상

  • 최소 Xcode: 15.2

  • 지원되는 macOS SDK: 14 이상

  • 참고: 최신 버전 사용시 일부 컴파일 및 링크 이슈로 인해 지원되는 Xcode 버전이 UE 5.6 대비 하향 조정되었습니다.

• iOS/tvOS/iPadOS/visionOS

  • 권장 OS: 최신 macOS 14 Sonoma

  • 최소 OS: macOS Sonoma 14.5

  • 권장 Xcode: 16.1 이상

  • 최소 Xcode: 15.4

  • 지원되는 Target SDK 버전:

  • iOS SDK 버전: 15 이상

  • iPadOS SDK 버전: 15 이상

  • tvOS SDK 버전: 15 이상

  • visionOS 2.4 및 Xcode 16.3 권장

    • 참고: v2.5 및 x16.4는 매우 제한된 테스트를 통과했지만 정상적으로 작동할 가능성이 높으며, v2 및 x16까지의 버전은 작동할 가능성이 높습니다.

  • iOS Graphics API: Metal 2.4 - 3.1

  • 기타 참고 사항

    • Shader Model 6(SM6)에는 macOS 15가 필요합니다. 이 지원은 베타 버전이며 현재 프로덕션 환경에서는 권장하지 않습니다.

• Android

  • Android Studio Koala 2024.1.2 August 29, 2024

  • Android NDK r27c

  • Android SDK

    • 권장 버전: SDK 34

    • UE 컴파일 최소 버전: SDK 30

    • 출시용 디폴트 타깃: SDK 34

    • 최소 설치 SDK 레벨: SDK 26

    • AGDE 디버깅을 사용하는 경우 AGDE v23.2.91+를 사용하는 것이 좋습니다. 이 버전에는 SIGBUS 오류 수정이 포함되어 있습니다.

  • 빌드 툴: 34.0.0

    • 35.0.0을 사용하려고 할 때 Windows에서 aidl을 사용하는 경우 문제가 발생할 수 있습니다. 이 문제는 35.0.1에서 수정되었습니다.

  • Java 런타임:

    • OpenJDK 21.0.3 2024-04-16

    • OpenJDK Runtime Environment(빌드 21.0.3+-12282718-b509.11)

    • OpenJDK 64-Bit Server VM(빌드 21.0.3+-12282718-b509.11, 혼합 모드)

  • 기타 참고 사항

    • UE는 Gradle 8.7을 사용하도록 업데이트되었으며, Android Gradle Plugin(AGP)은 8.5.2 버전으로 업데이트되었습니다. 디버깅에 Android Studio를 사용하고 있는 경우 Android Studio Koala를 사용하는 것을 권장합니다. Ladybug도 작동은 하지만 위 버전에서 Gradle 또는 AGP를 업데이트하지는 않습니다.

    • NDK 레벨을 선택할 때는 안드로이드 8.0 이상을 지원하는 android-26을 타깃으로 해야 합니다.

• EOS

  • 1.18.1.2-47370208

• Steam

  • 1.57

• Switch

  • 기본 SDK 버전: 20.5.6

  • 기본 펌웨어 버전: 20.1.0-2.2

  • 최소 SDK 버전: 18.3.1

  • 최소 펌웨어 버전: 18.1.0-1.0

  • Nintendo Package Manager: 1.7.0

  • 지원되는 IDE: Visual Studio 2022

• Switch 2

  • 기본 SDK 버전: 20.5.6

  • 기본 펌웨어 버전: 20.1.0-2.2

  • 최소 SDK 버전: 19.3.5

  • 최소 펌웨어 버전: 19.1.0-1.4

  • Nintendo Package Manager: 1.7.0

  • 지원되는 IDE: Visual Studio 2022

• PS4

  • 기본 Orbis SDK 12.508.001

  • 최소 Orbis SDK 12.008.011

  • 시스템 소프트웨어 12.508.001

  • 지원되는 IDE: Visual Studio 2022

• PS5

  • 기본 Prospero SDK 11.00.00.40

  • 최소 Prospero SDK 10.00.00.48

  • 시스템 소프트웨어 11.00.00.43

  • 지원되는 IDE: Visual Studio 2022

• ARCore

  • 1.48

• ARKit

  • 4.0

• OpenXR

  • 1.1.46

  • OpenXR 1.0 및 1.1 런타임이 지원되며, 프로젝트 세팅에서 비활성화할 수 있습니다.

출시 노트

AI/ML

Neural Network Engine (NNE)

New:

• Added multi-task support to the IREE CPU backed NNE runtime.

• Upgraded IREE to version 3.5.0. for NNE plugin NNERuntimeIREE.

Animation

Animating in Engine

New:

• Added a 'Tolerance' To the ControlRigPoseMirrorSettings Project settings that is used to match Controls also by position in rest pose. We still match by the Mirror table first, and fallback to position based matching. We also now cache the tables and reset them if a mirror table property is changed.

• Improved Anim Details

  • UX Editing multiple values no longer displays the first property value.

  • Releasing focus on multiple values no longer sets the first property value.

  • Shift clicking to the left of a property name no longer resets the property.

  • Added support for math expressions with multiple operators.

  • Removed support for =operator syntax, instead use operator =, e.g *=3 to multiply the current value by 3.

  • No longer show parent controls of the current selection, avoiding showing too many channels when a selected control has hosted channels.

  • Now follows the same order as Sequencer for non Control Rig properties

  • Now uses meta data of Control Rig elements and Object Properties that sequencer controls, value ranges are now displayed and respected.

  • Selected Anim Details properties now navigate to their value widget when pressing tab.

• Animator Kit:

  • Added a new Locator utility rig.

  • Adding static mesh locators and materials.

• Curve Editor:

  • The Set Start Playback Range and Set End Playback Range shortcuts now work in the Curve Editor as well as Sequencer.

  • A new preference, Panning Mouse Button, allows you to choose whether right or alt-middle mouse button, or both should be used for panning the curve editor view. Also, alt-right now always zooms in/out.

  • The Next Key and Previous Key shortcuts now work in the Curve Editor as well as Sequencer.

• Ensured we load an animation instead of trying to just find the package before we "Bake To Animation" so that it doesn't try to create a new asset.

  • Updated AnimationEditorUtils.cpp

Bug Fix:

• Deleting a Bool channel can no longer set the key at another time if AutoKey and KeyAll is on.

• No longer adds anim layers to level sequence unless needed.

• Constraints now work with Pivot Tool.

• Fixed shift click so it always goes to the last selected object, added a hot key to toggle pivot and motion trail modes.

• Made sure to automate tangents when baking.

• Made motion trails enter/exiting undo/redoable.

• Motion trails can be selected without a focused viewport.

• Made sure Rotator/Location/Scale controls have a curve color

• Pose library can paste onto hidden control rigs

• Made the AnimSequencerExport Blueprint type

• Anim Details:

  • Properties now reset their values to the initial value of controls when clicking reset to default.

  • Now also displays properties that reside within a Shot Track.

  • Fixed navigation not working in some cases.

  • Fixed an issue in Anim Details where selecting a component in a plain location, rotation or scale control would not select the control in Curve Editor.

  • No longer shows objects if keys are selected only.

  • Fixed property value widgets are losing focus while scrubbing if a blueprint actor is controlled.

  • Fixed in some cases editing Anim Details properties creates more than one undo step.

  • Fixed Anim Details options no longer showing when reentering animation mode

  • Fixed an issue where Anim Details displayed the actor or component name instead of the track name for attributes.

• Curve Editor:

  • Fixed issues where bezier curves were not always painted correctly.

  • Fixed an issue where curves were not painted when none of its keys were visible.

  • Fixed an issue where linear pre-/post-infinity extrapolation was not always painted correctly

  • Baking keys with a value different than 1 would increase range

  • Fixed an issue where pre-/post-infinity was not painted correctly when the first or last key's tangent mode was linear and pre-/post-infinity interpolation was linear

  • Fix an issue where curves flicker hovered and unhovered while editing

• Motion Trails:

  • Made sure the Motion trail state stays on with asset reload.

  • Fixed strobing frame coloring with dashed by setting the start frame to be eval range start so it doesn't change when view range changes.

  • Fixed crash when drawing HUD since trail may not be updated due to how the hud draws. Clean pin state in UI when using modifiers.

• Fixed an issue where changing additive animation modes with root motion on causes inconsistent root position when going from an additive mode to none.

• Fixed a bug where starting an animation with a non-zero playback time (like rewind debugger can do) would cause an incorrect root position.

• When merging sections no longer see if it's in range, just extend it so we can match up how it works without the merge.

• Now only compensate from the game thread.

• Can now set or add keys when recording control rig keys, previously we would just add keys causing duplicates.

• Anim Layers:

  • Bake Fix for absolute with additives when doing per frame bakes.

  • Make Name Column not shrink when shrinking

  • Layers show up when added to sub sequence

  • Keep track of open anim layer UI on the anim layer asset data.

  • Fixed duplicate/merging control rig sections when the channel layout is different between sections.

• Made generic vector channel data display more robust for position/rotation/scale control types. This also fixes the euler curve filter not recognizing rotation keys coming from Rotator control types.

• Sequencer: When baking to control rig, the animation track is now disabled instead of the individual sections.

• Turn off throttle when mouse button is pressed not just on drag so scrub time doesn't throttle in sequencer/curve editor

• Space Switching: Remove extra keys when clicking a space key by checking to see if we are changing into the same space in which case we can delete the extra key and the space key

• Hosted channels are no longer enabled if the parent is not enabled, this breaks selection. Also fixed anim layer selection with static meshes

• Sequencer: The scrub shortcut (b) now properly works in the viewport, Sequencer and Curve Editor.

• Fix Pivot square scale in different FOV's.

• Force LOD to 1 when ticking skel meshes when baking anim sequences. Sequencer may restore state which can change the lod during the bake process.

• Pivot Tool: Pivot render works in different FOVs

• Animation Kit:

  • Added aim option for blendParent. Changed control shapes to not be solid.

  • Fixing bad root attachment when no control rig exists.

  • Fixed an issue with the recompute mesh normals kernel used by Deformer Rigs in the Animator Kit plugin causing unexpected changes to mesh normals even if they are not influenced by deformer.

• Can no longer do space compensation from nongame thread which can happen when deleting many channels, in which case we probably don't want to compensate anyway

• Pose Library fixes, use alt drag for non additive drags and for additive it goes from -1 to 2.

  • Blending and additive mode are now working on mirror.

• Space Switching: Fix for undoing space switch key deletion.

• Tools such as snapper, trails and baking now work better with spawnables in nested subsequences

Character Customization (Mutable)

New:

• Added component naming support for spawned groom components.

• Debugger improvements:

  • Added support for Dataless parameters.

  • Unified Debugger and Editor compilation options.

  • Reordered some widgets for better use of the available space.

• Minor API improvements:

  • Actor:

    • Added ACustomizableSkeletalMeshActor::GetCustomizableObjectInstance.

    • Added ACustomizableSkeletalMeshActor::GetSkeletalMeshComponent.

  • Override Materials

    • Deprecated UCustomizableObjectInstance::GetOverrideMaterials(int32).

    • Added UCustomizableObjectInstance::GetSkeletalMeshComponentOverrideMaterials(FName).

• Restricted Passthrough Mesh Component to only support Skeletal Meshes.

Bug Fix:

• Fixed Material Parameter assert.

• Fixed Default Values not exposed to Blueprint.

• Fixed Skeletal Mesh Parameter morph check.

• Fixed UpdateSkeletalMeshAsync missing parameters.

• Fixed Materials comparison for merging.

• Fixed Textures and Meshes not being properly cached, their hash was not deterministic.

• Fixed a compiled API typo.

• Fixed multiple Dataless bugs:

  • Crash with Default Material parameter.

  • Crash with Dataless Morphs having names but no data.

  • Fix Texture Parameter not cropping images with layout operations.

• Fixed issues with GenerateMutableSourceImage cache.

• Added missing COI Contains API functions.

• Fixed public API Enum Parameter functions not working with the first parameter.

  • GetEnumParameterNumValues

  • GetEnumParameterValue

• Fixed deadlock when saving an asset + compiling a CO while asset registry was loading.

• Fixed streaming crash when no indices.

• Fixed meshes incorrectly reusing poses.

Deprecated:

• Removed deprecated 5.6 API functions.

Control Rig

New:

• Update default hotkeys and related functionality:

  • Set Solve Mode: Construction Event - 1

  • Set Solve Mode: Forwards Solve - 2

  • Set Solve Mode: Backwards Solve - 3

  • Set Solve Mode: Backwards and Forwards - 4

  • Set Next Solve Mode - M

  • Enable profiling- P

  • Show Controls as Overlay - U

  • Display Nulls - G

  • Display Socket - H

  • Display Axes for selection - J

  • Using hotkey for Profiling (P by default) now creates an undo step.

• Function nodes from other assets now show the asset name instead of the asset path.

• Flagged Render MorphTarget MaxBlendWeight CVar as safe for render thread, in order to avoid some warning logs.

• Made the animation show flags of the control rig editor never clip off of the viewport toolbar.

• Fixed duplicated Control Rig assets not resetting the asset variant ID.

• Control Rig Hierarchy no longer reserves transform space for non transform elements (curves and connectors).

• Control Rig Physics

  • Moved to its own experimental plugin, though it still requires the Physics Control plugin as well.

  • Added ability to import collision shapes and bones

  • Support for "wind turbulence"

  • Support for colliding against world objects

  • Add various cvars under controlrig.physics

  • Numerous improvements, especially access to functionality, and fixes

• Removed top level component concept from Control Rig Hierarchy

• Added GetSocketTransform

• Modular Control Rig:

  • Adding plugin Icon for Modules

  • Improved backwards solve for Foot Module.

  • Added Module tags and Root56 module to the correct ini files.

• Dragging a rig element onto the graph now offers an option to Get Metadata and Set Metadata.

• Update default settings and remember them per editor per user:

  • Display Axes On Selection is now enabled by default.

  • Display Axes On Selection, Axis Scale, Display Nulls, Display Sockets, Gizmo Scale, Hide Control Shapes, Show Controls as Overlays, Only Select Rig Controls are now saved per editor per user.

• Control Rig now only performs one copy of the hierarchy during initialization.

• Added line trace unit nodes.

• Added icon to plugin.

• Added Damp and Critical Spring Damp nodes to Control Rig.

• The Control Rig menu now shows directly in the viewport toolbar instead of being a submenu in the Show menu (eyeball icon).

• Nodes and hierarchy elements now offers options to find nodes by name locally and globally.

• Updates to Set Initial Transform from Current and related Commands

  • Set Initial Transform from Current is now only applicable for Bones, Nulls and Connectors.

  • For Controls, Set Initial Transform from Current is now Zero Controls.

  • For Controls, Set Initial Transform from Closest Bone is now Zero Controls from Closest Bone, and no longer applicable for Bones, Nulls and Connectors.

  • Set Shape Transform from Current is now Zero Control Shape.

Bug Fix:

• Moved findItemsWithTag to the construction event for performance.

• Fixed Control Rig curve container undo / redo breaking the curve list

• Fixed Control Rig editor resetting on compile curve operations made on the curve container (delete, rename, and import).

• Fixed a crash in Control Rig Pose adapter when removing bones from the skeleton while having a Blueprint with a Control rig opened in the asset editor.

• Fixed AnimNode Control Rig variable mappings initialization at OnInitializeAnimInstance.

• Control Rig: Need to update Rotation Order table with modular rig updated names.

• Fixed Control Rig Hierarchy updating more transforms than needed in propagate dirty flags function.

• Modular Control Rig

  • Added twist to legs.

  • Fixed IK/FK naming.

  • Added back public function from arm to leg so it picks up changes.

  • Fixed hind legs ik fk.

  • Changed leg and arm softness to off by default.

  • Fixed socket tooltip in Spine.

  • Fixed HindLeg FK controls not rotating.

  • Fixed AnimalNeck stretch.

  • Fixed Shoulder backwards solve by parenting to chest null instead of body ctrl.

  • Fixed HindLeg to always use connectors for creation instead of parent lookup.

• The editor now retains the Rig Solve Mode after compiling.

• Fixed Control Rig control module iterator lambda parameters creating copies of some expensive objects.

• Fix for client crash in FRigUnit_HierarchyInstantiateFromPhysicsAsset, due to Modular Control Rig object overrides getting garbage collected.

• Fixed ControlRig Hierarchy serialization not storing the previous hierarchy name map.

• Fixed crash in Control Rig editor when the preview floor mesh is not available, now it will trigger an error log and continue to load the asset.

• Avoid a crash in Control Rig when adding an empty rule to a connector.

• Fixed an editor undo redo in an AnimBPs that contains a Control Rigcrash, when performing a redo of a previously-undone SetPreviewMesh transaction.

• Anim In Engine: Rotator control keys are retained in Sequencer when the controls are changed to transform controls in the rig.

• Need to update Constraint Channels with updated Modular rig names, or constraints come in broken.

• Fixed ControlRig editor not executing post undo for the transient editor preview actor.

• Fixed undo / redo crash in Control Rig hierarchy mappings, when undoing across a construction transaction.

• Converted HandleExecutionReachedExit event to function callback, to avoid worker thread contention.

• Fixed ControlRig spawn control node details panel not generating the shape name list as a combo box.

• Fixed a crash in ControlRig when expanding a function reference from a different graph that contains a private function inside. Now the user will receive a localize request to make a local copy of the function.

• Fixed RigVM local variable customization not showing value for local variables not used in the graph and losing value after compiling.

Deformer Graph

New:

• Adding Deformer dynamically in Control Rig was changed to use Async Loading to avoid hitches when the Deformer loads.

• Enabled Compute Framework/Deformer Graph on mobile platforms.

• Fixed SkinWeightAsVertexMask Date Interface providing incorrect data when a non-default skin weight profile is used.

• Fixed skeletal meshes getting invalid tangents when using deformer graph with opengl_es31.

• Fixed wrong category for a few deformer functions.

• Added a pre-built dual quat deformer that supports both morph and cloth.

Bug Fix:

• Made sure skin weight profiles are requested earlier so that we can avoid T-Pose on the frame that the deformer becomes active / LOD changes.

• Fixed copy pasting resource node with matrix3x4 type creating a node with no pin.

• Fixed an ensure related to deformer graph instance settings in packaged build caused by incorrect object name used when creating the settings object.

Gameplay

New:

• Make Motion Warping switchoff conditions and warp target direction mode experimental as these APIs will change in future.

• Added support for animation mirroring to UAF.

  • Note this is a first pass and not fully matching Animation Blueprint's capabilities yet.

• Added a new version of AddAnimationNotifyEvent() that supports blueprint exposed data from notify events.

  • This helps prevent data loss when copying/duplicating animation notify events.

• Add SmoothWalkingMode to Mover2.0

  • Added base class SimpleWalkingMode to help make writing walking modes easier.

  • Renamed AnimationMath -> SpringMath and made public Rename SpringWalkingMode -> SimpleSpringWalkingMode.

  • Added Velocity Spring functions to SpringMath Add character prediction functions to SpringMath.

  • Added documentation to SpringMath.

• Added support for PoseSearchDatabase searches returning multiple results

• Added experimental support to the motion matching node (FAnimNode_MotionMatching) for interaction searches (multi character motion matching, to mimic FMotionMatchingTrait).

• Added a custom make bp function for FMotionWarpingTarget to ensure that the custom actor is called to calculate the target transforms when a component is passed as an input.

• The ChooserTable randomization column can now keep track of multiple recently selected entries and reduce the probability of reselecting them.

• Added new Chooser table column type (FPoseSearchColumn) to support motion matching searches within chooser evaluations.

• Add a spring walking movement mode to Mover named "SimpleSpringWalkingMode". This uses a critically damped velocity spring model to translate and rotate the character.

• Removed UE 5.5 deprecations from PoseSearch plugin.

• Exposed anim to texture editor functions as a public interface.

• Add threadsafe method for getting curve asset float & vector values.

Bug Fix:

• Fixed UE::PoseSearch::SDatabaseAssetListItem potentially referencing a deleted asset.

• Fixed a crash when opening the PoseSearchInteractionAsset editor.

• Fixed FSearchContext::GetSampleRotationInternal and FAssetIndexer::GetSampleRotation not properly calculating the rotation relative to their reference bone.

• Fixed motion matching tracing during throttled or skipped searches.

• Stored FBlendStackAnimPlayer::StoredAttributes as FMeshAttributeContainer instead of FHeapAttributeContainer to support animation LOD changes in blend stack.

• Fixed a pose search database indexing crash when using a UAnimNotifyState_PoseSearchSamplingAttribute referencing a bone that is missing from any channel included in the pose search schema.

• Fixed root motion sampling in blend stack.

• Fixed the motion warping switchoff condition to use the correct target transform when component following ends.

• Fixed a crash in UPoseSearchFeatureChannel_Phase::IndexAsset when indexing assets with a single pose, usually caused by a very short animation in a pose search database.

• Fixed UPoseSearchDatabase::SynchronizeWithExternalDependencies mistakenly synchronizing transient assets into a database, leading to reference garbage collected assets.

• Removed notify guids from Pose Search Database hash generation, otherwise the hash can be non-deterministic.

• Fixed a crash in FAsyncPoseSearchDatabasesManagement::CollectDatabasesToSynchronize with Objects with invalid Object->GetClass().

• Fixed the Alias state nodes not working with getters like GetRelevantAnimTime.

Deprecated:

• Deprecated UPoseSearchDatabase TArray AnimationAssets in favor of TArray DatabaseAnimationAssets.

• Deprecated UPoseSearchLibrary::UpdateMotionMatchingState.

ML Deformer

New:

• Hide certain conflicting properties (categories even) from the advanced preview scene settings tab. This was needed because the MLD asset editor has its own mesh picking and animation playback. Changing those properties inside the preview settings tab would mess things up. So we now hide those specific conflicting settings.

• Make curves work with UAF.

• Added support for copy paste between input bone and curve lists.

  • Means users can copy/paste the input lists from one model to the other.

  • You can now right click the input list widgets and choose Copy and Paste.

  • Fixed a few bugs in the tooltips as well as unique curve group name generation.

  • Improved the UX a bit by setting a minimum height for the bone, curve, bone group and curve group widgets and some context menu improvements.

  • Fixed some UI refresh issues as well when adding bones or curves. Curve group and bone group coloring did not refresh properly.

• Improved performance of the asset editor. Improved responsiveness to property changes, faster loading, faster sampling of anims.

• Added a new console command "MLDeformer.DebugDrawInputPoses" which will draw the input pose to the ML Deformer. It can be useful to quickly visually see what meshes have ML Deformers on them, and what bones are included.

• GeomCache: Some improvements to the memory management. Prevented reallocs, resulting in faster performance.

Bug Fix:

• Fixed a problem where training with curves would cause a failure during training.

• Fixed a bug where curves on the skeletal mesh instead of on the skeleton would cause some error checking to fail.

• Fixed a crash when adding a bone to the inputs of the ML Deformer.

• Fixed a crash on undo on morph based models. Also changed the icon of the Train button.

• Fixed python errors when launching with "-game" as argument.

• Fixed a bug when training, related to masks of input animations. Training would fail with some error right after sampling.

• Moved the tick group from pre physics to post physics.

• Fixed a VertexDeltaModel python import error. This was because an import should have been inside the Train function, but it was in global scope.

• Fixed async loading issues.

• Some fixes where it would not detect curves.

Physics Control

New:

• Now supports using a mask when invoking control profiles, which means they can be applied to a subset of the character.

• Additional support for specifying control/modifier set names in function calls.

• Kinematic targets are now specified the same way across PhysicsControlComponent, RigidBodyWIthControl and ControlRigPhysics.

• Fixed duplication of the Linear/AngularTargetVelocityMultiplier and TargetVelocityMultiplier parameters.

Bug Fix:

• General minor fixes/improvements to the physics control asset editor, including a fix for a potential crash.

Runtime

New:

• Added pinning and toolbar to workspace viewport and remove scene description tab.

• Now supports drag/dropping multiple bones in the abstract skeleton binding editor.

• Bone items can now be dropped onto non-set items in the abstract skeleton set binding editor.

• Added a filter for attributes to anim asset browser.

• Added Initialize as a default implemented event in the UAF module.

• State Machine: Self transitions & UX improvements:

  • Self transitions and state re-entry are now possible.

  • Re-entering a state uses inertial blending and requires an inertialization node. Old content will not use the new re-entry feature but any newly built content, when re-entering a state, will create an error if an inertialization node is not present root-wards in the graph.

  • The target state must enable bAlwaysResetOnEntry for the inertial blend to trigger.

    • To aid with managing state-reentry, a new MinTimeBeforeReentry value has been added to transitions.

  • Added 'reverse transition' context menu option that just reverses the direction of transitions.

  • Relinking transitions to other states can now be performed from the transition tail as well as the head.

  • State alias list is now sorted alphabetically to make finding states easier.

  • Look and feel of state machines has been tweaked & improved.

    • Now uses SVG brushes to better scale.

    • Different node types (states, aliases and conduits) now have different shapes.

  • Transitions now rotate to follow their direction and have been moved closer together and closer to their link line.

  • Transitions now sort in front of states.

  • Links are now further apart and scale correctly with zoom level.

  • Selection of links now scales correctly with zoom level.

  • Details panels for states now show the anim node functions for their result node and have been rearranged.

  • Added 'force transition' option to the context menu for state machines that are currently being debugged.

  • Made machine entry nodes non-deletable.

• Extended the Create Asset menu to allow non-asset menu entries for wizards that create potentially multiple assets of various types.

• Added a picker widget for animation attributes.

• Added toggle to blend layer trait to blend in mesh space.

• Added live updating blend mask weights in the profile blend node.

• Updated animation blueprint interface icon in the 'My Blueprint' tab to show as blue when the function has been implemented.

• Exposed Curve Metadata API on the Skeleton to Blueprint and Python. This includes functions to query, add, remove and rename curve metadata as well as querying and setting material and morph target flags.

• Disabled adding set bindings without a set collection set.

• Added a viewport to the workspace for UAF.

• Paused preview animation while manipulating transform widget in animation editor.

• Added an asset wizard for help authoring UAF content.

• Added foundations for the abstract skeleton runtime.

• Added editors for the abstract skeleton assets.

• Added functionality to Open in New Tab via the context menu for collapsed nodes and function nodes in UAF

• Fixed collapsed nodes and functions in UAF workspaces being opened without context of their outer, leading to loss of access to variables.

• Fixed debug only assert when opening items via double click the workspace outliner.

Bug Fix:

• Fixed a missing drag-drop op for adding attributes to sets in the set collection editor.

• Caught a situation where the mesh asset in InitializeAnimScriptInstance is invalid. Also dealt with possible parallel anim eval tasks being in flight.

• Fixed a crash when trying to create a new UAF Workspace instead of picking an existing one when prompted to choose a workspace after opening a newly created UAF Graph.

• Fixed slow document navigation in the workspace editor.

• Fixed a crash when attempting to add an existing curve attribute to abstract skeleton binding.

• Fixed being able to rearrange a trait onto itself.

• Fixed for animation modifiers not reverting correctly and crashing in some instances.

• Fixed a crash when re-removing a pin on a blend multi node after undoing.

• Fixed a broken root motion extraction during animation modifier evaluation.

• Fixed a regression in root motion extraction which prevented animation modifiers from reading raw uncompressed data during the compilation process, causing them to fail

• Fixed missing text localization in pose asset widget.

• SkeletonCompatibility: Fixed a problem when using compatible skeletons where we could end in a situation where the source skeleton did not have a bone of the target skeleton, which could lead to a crash.

• RBAN: Ensure RBAN doesn't write NaNs into the pose.

• Fixed visualization of what the blend weight of the animation is in Animation Insights for Random Sequence Player. Now it takes the overall blendweight of the animation into account as well.

• Fixed the look at edit mode locator gizmo not updating location when changes are made in the details panel

• Anim State Machine:

  • Fixed incorrect duplicate GUID warning when a transition rule is shared.

  • Prevented renaming states to 'None'.

  • Fixed copy-paste of transition nodes creating duplicate GUIDs/assets.

  • Fixed clamping values preventing manual entering of valid negatives.

• Anim Sequence: Fixed thumbnail scene references preventing deletion when assets contain notify states.

• Anim Assets: Fixed a crash when creating a preview scene for assets with a deleted compatible skeleton.

• Fixed the animation sequence segment length

• Fixed a button in the montage editor not working due to property access type mismatch

• SkeletalMeshComponent: Fix meshes getting ticked offscreen incorrectly when using montage-related visibility options

• Fixed pose history and trajectory history desync by delta time, causing incorrect results especially noticeable when the component transform makes large translation and rotation, e.g. a 180 pivot.

  • This fixes a bug with bad pivot selection when the capsule rotation flips

• Fixed incorrect timings on trajectory history when delta time is not constant.

• Fixed duplicate trajectory entries around t = deltatime.

• Fixed the set collection editor not updating when renaming a set, and added rename to the context menu.

• Fixed the expansion state of tree items resetting when drag/dropping a bone in the abstract skeleton binding editor.

• Fixed drag-dropping segments into composite track not matching selection order.

• Fixed window scaling issue when dragging multiple notifies in the animation editor.

• Changed check to ensure in SkeletalMeshComponent to avoid crash using rewind debugger.

• Fixed many SAssetShortcuts unnecessarily refreshing on asset opening resulting in slow ABP navigating.

• Animation Budget Allocator: Enabled component tick when unregistering.

• Updated the animation attribute functions to not allow adding an attribute with a name that already exists.

• Anim BP: Fix cook non-determinism with generated 'mutables' struct

• Anim Instance: Fix memory leak when GC-ing both mesh & anim instance in the same pass.

• Fixed an issue with tooltip names in SOverrideStatusWidgets.

• AnimSequence: Fix uninitialized pose transforms being generated in some circumstances

• PropertyAccess: Fix memory leak when calling functions via property access that return non-POD values.

• Anim Decompression: Removed usage of deprecated GetCompactPoseIndexFromSkeletonIndex.

• Fixed copying notifies when duplicating an anim sequence so the new notifies no longer reference the old sequence.

• Fixed the UAF asset wizard template assets being visible in the content browser and selectable in the workspace picker etc.

• Added more inline crash details when invalid values are found in animation poses.

• PropertyAccess: Hardened GetAccessAddress in case of unexpected data.

• SkeletalMeshComponent: Fixed a crash when calling SetAnimInstanceClass during a notify callback.

• Triggered caching of all otherwise lazily computed data when a DNA is loaded from a binary stream, which can avoid potential race conditions if the same DNA reader is utilized in a multithreaded environment.

• Fixed not being able to move nodes within newly created comment nodes in Control Rig and UAF.

Deprecated:

• Removed deprecated Skeleton Compatibility code from the Skeleton class.

• Removed deprecated Curve code from the Skeleton class.

• Removed deprecated Mesh Linkup Caching code from the Skeleton class.

Sequencer

New:

• Property tracks can now be renamed.

  • Note, the tooltip will still show the actual name of the property being animated.

• Added setting to always stop when going to playback start or end.

• Sequencer Navigator: There are now columns for the sequence ID and the object binding ID which are useful for debugging purposes.

• Take Recorder: Add a cvar TakeRecorder.AllowPossessablePIEObjects to bypass disallowing recording PIE objects as possessables. The default is to not allow this (no change in behavior). This can be useful when recording a player pawn.

• Added scripting to text

• Added ISequenceVisitor callbacks for when the visit enters/exists a sub-sequence

• The camera cut track now supports multiple rows. When multiple rows exist, the camera cut track does not try to auto arrange sections.

• MovieScene: Exposed FLevelSequencePlaybackContext to other modules.

• Hot key scrubbing will continue playing if Sequencer was playing.

• Preview camera cuts in simulate. This also lets users enable/disable seeing camera cuts in PIE after ejecting from the player controller.

• The colors for the playback start/end range can now be customized by user settings.

• Added support for notification callbacks when animating properties.

• The timeline in the cinematic viewport now respects the snapping behaviors of the Sequencer timeline.

• Added fixes and improvements to the time space display. The desired time space and the local time space are now both drawn.

• Bake Transform now has an option to bake with time warp applied.

• Attach sections with Preserve None now default to infinite duration.

• 'Bake Animation Sequence' and 'Create Linked Animation Sequence' actions in Sequencer now remember the last folder that was used in the current Editor run.

• Bake Transform is now available in the Template Sequence and Camera Animation Sequence Editors

• The subsequence section's Origin Override Location/Rotation now respect the default float/double spinbox incremental behaviors.

• Sequences: Add PlayReverse function to actor sequence components.

• Editing scale channels in the Sequencer Key Details now has an option to preserve the scale ratio

• Save As is now available in the Template Sequence and Camera Animation Sequence Editors.

• Added the ability to get and set Mute Nodes, Solo Nodes, Deactivated Nodes, Locked Nodes, Pinned Nodes, and Binding Tags in Blueprints/python.

• The view and working ranges are no longer saved with the asset. Every time you open a level sequence, it will be zoomed to the playback range.

• Duplicate keys are now removed on mouse release

• Update tooltip to "The interpolation type for the initial keyframe" to clarify that this is only for the first keyframe on the track/section

• UE_API all blueprint exposed functions for Sequencer Scripting

Bug Fix:

• Refactored track instance bindings and added the concept of "volatile" paths to fix possible memory stomps when animating array items or instanced structs.

• Fixed an issue where when changing shots we could sometimes get one frame of t-pose on a character when using bForceCustomMode. The issue was that we were checking for custom mode too late in the frame relative to when we were potentially doing the binding to a custom anim instance.

• Fixed the color not reverting when pressing cancel on the color picker.

• Added an adjustment for an issue for capturing thumbnails for sequences. Renders at a square aspect ratio and cleans up some advanced rendering features to create the cleanest image possible like materials.

• When opening a sequence, the playback mode is now set to loop selection range if a selection range is set.

• Fixed the BakeToControlRig function. Now fetches the templateID for the sequence that we're in so that if the sequence we are working on is a nested, instance, or template sequence we can resolve objects within the function.

• Added support for indirect gizmo manipulation of sub track offsets.

• Added support for animating property bag properties.

• Fixed a possible GC leak with UMG animations. It happened when using an event track, and the widget is removed from its parent while the animation is playing, and then the inactive widgets pool is discarded and GC'ed.

• Sequencer Navigator: The marks column now properly updates when marks are changed/added/removed.

• Exporting a binding that doesn't have a valid spawnable template no longer crashes

• Fixed a GC error in restore state of skeletal mesh animation track.

• Properly implemented end-at-time feature.

• Now stores camera shake previewers as shared pointers because FGCObject classes are not relocatable.

• Fixed Material Parameter Collection track display name so that it's not set explicitly on creation. Instead, the display name is just the name of the MPC if the user hasn't changed it. This allows the user to change the MPC and the name will automatically change.

• Proxy bindings no longer allow you to mistakenly pick the same actor it is a proxy for.

• Key selection is no longer emptied when right clicking on the timeline.

• UMovieSceneSequence: Fixed nullptr crash.

• Fixed pre-roll/post-roll sometimes still evaluating sections that aren't set to evaluate there.

• No longer falls back to the double blender system when a property doesn't have blending information. Instead, it falls back to the fast path where we don't blend anything.

• Fixed broken support for ping-pong playback when we only cross the loop boundary once.

• Fixed the pre-animated state being incorrectly saved as "persistent" for root tracks.

• Deleting a muted track row now properly no longer causes other rows to lose their mute state.

• When a fixed timescale is set negative, ranges 2 levels down no longer collapse causing subscenes of subscenes not to play correctly.

  • This only fixes the case of fixed timescale. Similar issues still occur using the playrate/timescale curve.

• Copying a folder now properly copies root tracks as well.

• .MovieSceneSequenceExtensions::FindBindingByName now returns a more reliable binding because it gathers the names from FMovieScenePossessable and FMovieSceneSpawnable which are kept in sync with the actor labels.

• Fixed a regression with a deprecated code path for fetching what animation is playing for UMG Sequences.

• Fixed pause-at-frame logic, which was sometimes incorrectly pausing on the previous frame.

• Select All Keys Forward and Backward now properly select all the requested keys.

• Selecting a layer bar no longer mistakenly deselects component bindings.

• Collapse Nodes and Descendants now properly collapse after being expanded.

• Copying a folder now properly copies all bindings and their child component bindings.

• Payload objects for event keys are no longer lost.

• Disallow picking a proxy binding that's already bound to the current one.

• Remove the "Blocking Evaluation" checkbox from the advanced menu, since we can already set it from the playback options.

• Fixed ongoing focus issues in the key details. Sequencer are now committed when focus is lost and keys are not accidentally created with incorrect values.

• Fixed the time warp curve still evaluating even while muted.

• Fixed a bug where the keyable indicator would not update for the selected object in the details panel after opening a sequence. It required adding to the sequence or selecting new objects.

• Fixed pre-roll/post-roll sometimes still evaluating sections that aren't set to evaluate there.

• Removed calling Modify from SetPreRollFrames / SetPostRollFrames. The caller should be responsible for calling Modfiy().

• If you copy an event track from one sequence to another, the events in the pasted event track will point back to the blueprint director in the copied sequence. This is not allowed, so those events are now cleared.

• Fixed creating an object property track as a class property in python not properly setting the bClassProperty value which allows a class chooser to pop up instead of an object chooser.

• Fixed keys not selectable on multiple rows.

• Restored a section model expansion state to be closed if it was before, since RestoreLayout resets it to expanded.

• We now tear down the Take Recorder's Sequencer instance before we delete and GC the sequence.

• Re-added dropped support for Blocking Evaluation in UMG animations.

• Fixed a crash when reinitializing a Sequencer editor on a new sequence while the previous one had legacy tracks

• When importing cameras, now applies a uniform scale modifier to distance based parameters (Manual Focus Distance).

• No longer blends enum values, and make the byte track use the enum system when it animates an enum.

• Ensured that evaluation context buffers are flipped if an eval task is active prior to forced update.

• Added a potential fix for a memory corruption of UMG animation states.

• The topmost unmuted Cinematic Shot is now correctly evaluated.

  • Previously, if a muted Cinematic Shot was topmost, it wouldn't be skipped over.

• Fixed some properties that should appear to be animatable (i.e. FieldOfView and AspectRatio for Cine Camera Components).

• Fixed an issue that when converting to a spawnable, sometimes the original possessable meshes were still visible.

• Fixed undo of camera cut section now restoring the camera binding properly.

• Fixed regression of pre/post-roll behavior in the skeletal animation track.

• Creating the initial key for material tracks now respects the default interpolation type setting.

• Snap play time to pressed/dragged key only if snapping is enabled.

• Fixed a reference-leak in the Track Instance system.

• Setting the time of a key through the Properties menu now works properly.

• Keying specific channels of a transform through the Details Panel now properly sets the key with those current values (and not 0).

• Fixed calls to bool property custom accessors, which were using the wrong function signature.

• Better handling looping for camera cut tracks:

  • Added a new "HasLooped" flag on the evaluation context.

  • Assumes by default that looping sequences are "seamless" and do not create a straight/hard camera cut on loops.

  • Added an advanced evaluation flag to opt out of this assumption.

• Fixed undo not working when editing with control rigs.

• Now fully supports all camera and post-process properties when previewing blending camera cuts.

• Disabled ensure before cleaning up camera cut track viewport modifiers.

• Fixed regression in how skeletal animation sections behave when resized from the left edge.

• Take the first loop start offset into account when determining if a skeletal animation section needs to loop.

Deprecated:

• Deprecated FMovieSceneBinding::Name since it's redundant and not kept in sync with actor labels.

• Can now return multiple objects with FMovieSceneBindingResolveResult. FMovieSceneBindingResolveResult's Object is deprecated in favor of an array of Objects.

• Migrated text tracks to Movie Scene Tracks plugin (enabled by default). Deprecated MovieSceneTextTrack plugin.

Skeletal Editing

New:

• Skin weight profiles can now be switched directly in the skeletal editor viewport, if there are skin weight profiles defined for the skeletal mesh asset.

• Edit Weights Tool: Fixed removing weights from vertices weighted fully to a single bone turning them into unweighted vertices.

Bug Fix:

• Animation: Editing the text field in the curve editor of an anim montage no longer crashes.

Editor

Datasmith

Bug Fix:

• Fixed 3dsmax plugin support for 2026.

Framework

New:

• Fixed GetOwnerPackages() for instanced structs inside non-complex properties.

  • FStructurePropertyNode::GetOwnerPackages() fails at walking up the property nodes for a specific case, and may trigger an ensure. When stumbling upon an instanced struct, GetOwnerPackages() walks up by getting the direct parent.

  • However, this parent is not necessarily a complex parent (can be a non-object/structure property type). To make sure the walk happens correctly, the case should be handled the same way GetInstancesNum() does (get complex parent of parent).

• Added a few virtuals to cosmetic SGraphNode getters.

  • Useful while adding advanced styling in custom node editors. In some cases it might be possible to avoid overriding engine methods by implementing our own variants, with different names, but not in every case.

  • Also reusing original methods makes the programmer's intent much clearer - what part of the base class was actually overridden.

• Implements experimental Capture Stealing in ITF Input Router.

• Updated MathStructCustomization metadata extraction to include InstanceMetadata

  • This change updates metadata extraction for header row to include InstanceMetadata. It is useful when assigning metadata to Vector/IntVector types via other customizations.

• UToolMenu Items will now override any parent Tool Menu Items of the same name.

• Positioned Tool Menu Items that fail to be positioned will now be inserted at the end of the section.

• Improved reliability of legacy SExtensionPanel support in the new viewport toolbar. Extensions are only enabled when there is enough information to support their existence.

• ToolMenus: Adds options for whether a Tool Menu Entry with an insert position that can't find its target should insert anyways and/or log.

  • Defaults to both inserting & logging.

  • Disables logging if the ToggleViewportToolbar and ToggleHideViewportUI commands can't find the ToggleFullscreen command in the Level Editor Window menu.

Bug Fix:

• Fixed an edge case Blueprint Editor crash on exit.

• Fixed an issue where top-level toggle buttons in Viewport Toolbars looked like raised buttons.

• Users can now change the derived type on default value instantiations used to initialize a base type reference member in saved instance data when using override serialization.

• Fixed the asset reference filtering not working when dropping assets on Material, Niagara Script and Texture Graphs, or on nodes and pins of any asset graph type.

• Fixed inconsistencies between drag and drop visual feedback and drop behavior in Animation State Machine, Sound Cue, and Texture Graphs.

Deprecated:

• The old Level Viewport Toolbar Panel Extensions are now deprecated. They will be removed in a later version.

Interchange

New:

• Reduced memory usage when importing static meshes.

• Added a SubdivisionAPI custom schema for specifying per-prim subdivision level.

• Added support for array node attributes.

• Added support for subdividing static meshes and geometry caches when importing via USD Interchange.

• Added more C++ UsdWrapper types and tweaked the Unreal.natvis file to improve how they're displayed on the debugger.

• Upgraded MaterialX version to v1.39.3.

• Textures imported with non-power-of-2 dimensions or non-multiple-of-4 dimensions were previously automatically set to NeverStream and Uncompressed. This can now be toggled with a config setting :TextureImportSettings::bDoAutomaticTextureSettingsForNonPow2Textures .

  • Also when textures initially imported as nonpow2 are re-imported as pow2, they now get their settings automatically fixed to the defaults for pow2 textures.

• Improved the performance of importing skeletal meshes with multiple morph targets via USD Interchange.

• When importing USD stages through USD Interchange, SkeletalMeshComponent prims will be spawned with AnimSequences assigned to them, if any were imported.

• Added a "Use Single Bone" option to import a static mesh as a skeletal mesh with top node as the only bone.

  • If "Force All Mesh as Type" is set to "Skeletal Mesh" and "Use Single Bone" is checked, the imported skeletal mesh will have a unique bone at its origin called "Root".

• Added a new option to the USD Export Options dialog when exporting levels to USD called "Export to Nested Sub Folders", which restores the previous behavior of exporting asset layers to a folder structure that mirrors the content folder structure

• Interchange: Added support for importing OBJ into level.

• Reduced memory usage when importing skeletal meshes.

• Upgraded OpenUSD version to v25.08.

• Interchange USD can now import groom assets and groom caches.

• Added support for dome lights via SkyLightComponents when importing via USD Interchange.

• Removed FNavigationOctree::AddNode Warnings during Level Import.

• Implemented a Nanite triangle threshold value on the Interchange generic asset pipeline, in order to enable Nanite only for meshes past a triangle count size.

• The USD Interchange translator has a new setting for collecting prim metadata as translated node user attributes. It can also specify a regex for filtering of particular metadata fields.

• Refactored the LevelSequence handling for USD imports in order to properly support subsections due to references and payload arcs.

• Importing via USD Interchange will now reuse generated assets when importing instanced prims.

• Added support for OpenUSD on Windows ARM64.

• Refactored skeleton handling in Interchange USD to not consider the skeleton prim itself as a root joint, which prevents transforms applied directly to the skeleton from being ignored in some cases.

• Interchange USD imports that preserve the pseudoroot node will now produce a top-level actor named after the root layer's display name, as opposed to being always named "/"

• Now uses the default static mesh collision profile for static meshes generated via the USD Stage Actor imports.

Bug Fix:

• Fixed Reimport not showing skeletal mesh conflicts.

• Fixed missing AnimSequence assets when importing animation tracks via Interchange that have a total length below MINIMUM_ANIMATION_LENGTH (of 1/30 seconds)

• USD: Editing keys in Sequencer now properly update back to the USD Stage.

• Fixed node name collision suffixes appending to previous suffixes, producing names like Cube12345

• Fixed actors with identity transform being imported via Interchange with the inverse transform of their parents in some cases.

• Fixed imported LevelSequences overwriting others with the same name when importing some very complex USD scenes.

• Fixed cameras imported from OpenUSD with fStop of zero so that depth of field effects are correctly disabled.

• Fixed incorrect skeletons being imported via Interchange FBX in some edge cases when TransformLinks seem to represent local transforms.

• Fixed static mesh collider transforms being incorrect in some cases when importing into level with Interchange.

• Fixed some issues with baked skinned mesh transforms when importing skeletal meshes with morph targets via USD Interchange.

• Fixed how AnimSequences seemed to have no animation data after using Actions -> Import on the USD Stage Editor.

• Fixed issues with using Material Search Location when importing scenes with Material Instances via USD Interchange.

• Fixed automated reimports still showing the options dialog when reimporting via Interchange or USD.

• Fixed metadata not making it onto actor AssetUserData when importing scenes via Interchange in some scenarios.

• Now discards empty LevelSequences when importing from USD.

• Fixed SparseVolumeTexture assets not being generated by USD Interchange when importing scenes with volumes if the exact same volume node shows up on the stage more than once.

• Fixed a crash when trying to parse USD LodSubtreeAPI schema applied to skinned meshes.

• Fixed import of UsdPreviewSurface into Material Instances for USD materials that have output connections to other shader graph or material prims.

• Fixed performance bottleneck when importing many lights via USD Interchange.

• Fixed some name-prefix-based collision meshes not being correctly used when importing via Interchange in some cases involving name collision.

• Can now generate the desired simple collision meshes even if the shape disagrees with the provided mesh data.

• Fixed morph target normals and position offsets not being skinned with geomBindTransform when importing skinned meshes via USD.

• Fixed how Interchange USD was not using timeCodesPerSecond values when baking skeletal animation tracks.

• Fixed incorrect vertex ordering of subdivision surface meshes imported from OpenUSD when their orientation is "leftHanded" and subdivision is enabled.

• Fixed a crash when parsing some USD SkelRoots configurations with multiple Mesh prims that contain normals.

• Fixed how USD asset imports were persistently disabling the "Import Into Level" option to import actors.

• Fixed OpenVDB being imported via USD stages without compensation for the stage's upAxis and metersPerUnit values.

• Fixed level exports to USD always using absolute file paths for layer references and payloads.

• Fixed Euler flipping issues when importing some USD stages with complex rotation animation.

• Fixed invalid skeletons being produced when importing some USD stages with prim names that are not globally unique.

• Fixed various issues while importing an asset containing elements named "None"

• Fixed support for UDIM textures when opening or importing USD Stages via the USD Stage Actor.

• Silence a couple warnings when trying to fetch transforms from Interchange scene nodes with none authored.

• Fixed missing actors and assets when importing scenes via USD Interchange that contain sibling prims whose names differ only by character casing.

• Fixed a crash when resaving assets imported with Interchange after deserializing them with Interchange disabled.

• Fixed HeterogeneousVolumeComponents not refreshing after their SparseVolumeTextures imported via USD Interchange were reimported.

• Fixed incorrect skeletal mesh influences when importing skeletons with multiple root bones via Interchange USD.

• Fixed various import issues related to using names that resolve to NAME_None.

• Fixed risk of missing content when importing FBX containing assets or bones requiring name sanitization.

• Fix SparseVolumeTexture assets imported via Interchange USD ending up named as "Null" if the VDB filename itself was purely numeric.

• Fixed the handling of some skeletal mesh edge cases via Interchange USD, like nested LOD meshes.

• Fix transforms placed directly on LOD meshes being ignored when importing into level with Interchange USD.

Scripting

New:

• Exposed FullyLoadPackages/FullyLoadAssets functions to editor scripting via EditorLoadingAndSavingUtils

  • These fully load the given objects, so that UE no longer has a write lock on their on-disk files (eg, when needing to overwrite the file via an external application).

  • This is also available in the UI via Asset Actions -> Load, if you hold shift while clicking on Load.

• Added support for texture-based tool icons in Scriptable tools.

• Added support for setting a custom UUserWidget above the tool details panel of a Scriptable Tool.

• Preview Platform Blueprint Functions:

  • TogglePreviewPlatform: Toggle the Preview Platform On/Off

  • SetPreviewPlatform: Sets the Preview Platform.

  • The Preview Platform is set from a list of valid Preview Platforms, the same present in the Preview Platform Menu.

• Added a Disable Preview Platform Blueprint Node.

• Added a GetDrawableGeometryActor() BP function to fetch the actor that owns any line, point and triangle sets added by a Scriptable tool.

• Exposed FTSTicker to Python:

  • This exposes the superior and safer FTSTicker-based ticking method to Python, and existing Python scripts using the Slate-based ticking methods should consider migrating to use this new method (unless forwarding ticks to an embedded UI framework, which was the intent of the Slate-based ticking methods).

  • The new ticker callables can be registered via `unreal.register_ticker_callback(...)`, which takes a callable (taking a float delta time, and returning a bool where True means continue to tick), along with the delay (in seconds; default 0) that we should apply between each ticker callback. `unreal.unregister_ticker_callback(...)` can be used to remove a previously registered ticker callback.

  • Examples:

    • def run_once(dt): print("run_once") return False # stop ticking

    • unreal.register_ticker_callback(run_once, 1.0) # call run_once once after 1 second

    • def run_many(dt): print("run_many") return True # continue ticking

    • run_many_handle = unreal.register_ticker_callback(run_many, 1.0) # call run_many repeatedly after 1 second delays

    • unreal.unregister_ticker_callback(run_many_handle) # stop calling run_many

• Exposed the ability to include or exclude editor-only references from script asset registry queries

Bug Fix:

• Added an encoding fix for PipInstall to force a utf-8 encoding.

• Fixed a crash in ExecutePythonScript when Python was disabled at runtime.

• Fixed a crash when re-registering Scriptable tools during mode shutdown.

• Fixed reachable garbage objects warnings when compiling ScriptableTools containing ScriptablePoint/Line/Triangle sets.

• Fixed an issue with accept/cancel/complete actions not firing in ScriptableTools mode.

• Fixed 'no world was found for object' warnings when invoking WorldContextObject functions in a Scriptable tool.

• Fixed a crash when calling DataTable RemoveRow from editor scripting.

• Fixed non-deterministic tool order in Scriptable Tools category palettes.

• Added a fix to ensure AssetTools do not call slate functions in headless.

• Fixed Python Callback attached to Dynamic Delegate

• Editor can now run even if Python is not able to load properly.

UI

New:

• Significantly improved the Content Browser column sort performance for large search results.

• Updated the Content Browser navigation bar so clicking in the empty space edits the package path if available instead of the virtual path.

• Slate drawing optimization: fixed float comparison of the alpha that could send an invisible element to the renderer, for negative or small alpha values.

• In the graph editors, right clicking to summon the node context menu now includes the hovered wires connected pins, if any. This allows, for example, insertion of a 'NOT boolean' node on a bool wire in the blueprint editor

• Made the "Show Selected" action for actors always visible in the context menu.

• SlateIM: Add support for Tab widgets

• CommonUI:

  • Updated CommonWidgetCarousel to be more consistent in its widget caching.

  • Added an option to determine whether or not to cache widgets at all

  • Old behavior was to cache widgets in the carousel's RebuildWidget, but widgets added at runtime via AddChild would never be cached.

  • Currently caching is enabled by default to match the behavior when children were added at design-time, though this could result in increased memory usage in use cases where all widgets were added dynamically.

• Added a clockwise ordering option for DynamicEntryBox.

• Updated the source control Submit dialog to display full file paths for non-asset files in the Path column.

• Waveform editor: Add icons for fade options

• Waveform:

  • Now calculates LUFS and Sample Peak values on audio import, on Waveform Editor open, and on Waveform Transformation changes.

  • Now displays LUFS and Sample Peak as meta data when hovering over a soundwave in the content browser.

• The Path column in the Asset View will now display the package or object path of the row item if available instead of the virtual path.

• Redesigned Platforms menu moved from the toolbar to the main menu.

• Can now specify a screenshot view rect via FScreenshotRequest::RequestScreenshot:The view rect will be ignored if it is invalid (empty or not within the extent of the render target), or if bShowUI=true, since that takes the slate widget screenshot pathDefault behavior remains the same (to screenshot the whole window)

• Enabled 10-bit swap chains on desktop platforms even when the feature level is ES31.

• Slate: Modified GetCachedWidget:

  • GetCachedWidget now returns the Widget returned by RebuildWidget.

  • GetWrappedWidget returns the Widget return by RebuildDesignWidget if available. Otherwise, returns the widget returned by UIComponents via RebuildWidgetWithContent.

• Added InitializeInEditor function to UserWidgetExtension and WidgetBlueprintGeneratedClassExtension to be able to support proper initialization in Editor for Extensions.

• Added utility functions to query private states in the widget.

• UMG Bindings: Added a new Conversion Function SetVectorParameter that takes a FColor and converts to FLinearColor.

• Added support for package path suggestions to the Content Browser navigation bar.

• Added support for navigating to C++ class package and object paths entered into the Content Browser navigation bar.

• Optimized the font shaping process when using complex shaping (typically for Arabic).

• Added a Python script for generating an html color palette for the FColorList class.

• Updated mouse capture and high precision mode handling on Windows to save up to .5ms on redundant API calls

• A UFont can now be a wrapper around FCoreStyle::GetDefaultFont(), for use with editor UI.

• Added a CVar `Slate.UseSharedBreakIterator` to support shared ICU Break Iterators to reduce CPU usage. False by default.

• Added new Header and ToolHeader sections to the ToolkitBuilder.

• Added support for MVVM Bindings in asset diff tool.

• Exposed world context pin on MVVMViewModelBase. This allows blueprints on a Viewmodel to access world subsystems (assuming they have an object they can use to resolve the world context).

• Add SetLazyContentWithCallback to CommonLazyWidget to improve async usage in blueprints.

• Add blueprint function, SetViewModelByClass, for setting VM by class on a widget directly to simplify usage.

• Exposed a setter for CategoryToolbarVisibility in FToolkitBuilder.

Bug Fix:

• Fixed a regression where Toolbar buttons with a combined options menu did not display that options menu when the toolbar button was clipped.

• Fixed an issue where Spline-related UI elements were displaying XYZ axis labels and tooltips even when the editor was running in LUF coordinate mode.

  • Details: Updated the context menu and details panel for Splines so that axis labels, tooltips, and action names now correctly reflect LUF when active.

  • This includes context menu areas like SnapAllToSelected, SnapToLastSelected, and SetLockedAxis (temporarily disabled).

  • This also includes Details panel areas for Spline settings like Selected Spline Nodes Location, Rotation, Scale, Arrive Tangent, Leave Tangent, and Up Vector Logic was added to ensure these UI elements are now dynamically aligned with the current coordinate system.

  • XYZ (FLU) remains the fallback when LUF is not enabled.

• UMG Sequencer: Fixed 2 issues.

  • When adding an event track as the first item in a widget animation, the duration of the animation would reset to 0, and notably the playback range start would be set to exclusive (range as (0,0)). This would persist after the length changed, for example to (0,500), meaning that any items placed on the 0 frame, such as events, would never evaluate.

  • When not encountering the above issue, items placed on the 0 frame would evaluate twice. This was due to a refactor to the way widget animation would playback.

• Fixed the Asset View Type column sorting by the full class path rather than the display name that is displayed.

• UMG:

  • Fixed named slot content not saving for named slot instances of widget blueprints that extend widget blueprints.

  • Fixed CDO de-sync with root widget property changes.

  • Added a fix to avoid crashes in cases of re-entrancy.

  • Various fixes for widget animations:

    • Fixed a crash caused by the runner being invalid for an unknown reason.

    • Fixed iteration of active animations that can grow during that iteration.

    • Fixed iteration of animated widgets that can grow during that iteration.

  • Fixed first and last frame evaluation of animations - Don't tick the widget on the first frame, wait until the next frame. The flag for that was lost during the animation refactor in 5.6 - Fix the evaluation time for when stopping which should indeed be the first frame of the playrange, not frame 0. This was incorrectly ported during the animation refactor.

  • Fixed how we consume the current animation time on play, to prevent events at frame 0 from firing twice.

  • Double clicking on a color key in the timeline now correctly opens the color picker.

• Fixed an inconsistency in the Viewport right-click context menu, where the Transform options were always ordered according to FLU rather than the expected LUF, even with LUF coordinate system in use. Behavior is now consistent and context-aware across coordinate systems.

• Can now pick struct type when class type picking is enabled, eg, from within the Data Table editor

• UMG Designer:

  • Fix to FWidgetBlueprintEditor::SelectObject to support UObject selection. Fixes a nullptr access when a property was changed in the detail panel on an object that is not a UWidget.

  • Fixed a crash in Drag and Drop operation. Added more checks around calls to GetCachedWidget that can return a null object during drag/drop and move operation.

  • Fixed a crash in UMG Designer Replace widget context menu operation in the Hierarchy panel. This happened when using the replace function with a User Created widget selected in the Palette panel.

• Optimized the widget editor's palette to reduce refresh cost in large projects.

• Fixed virtual texture thumbnails sometimes showing the wrong texture.

• Fixed an issue where screen-space widget components wouldn't render for players other than player 1 if splitscreen is disabled. There is now an option (ShowAllPlayerWidgetsWhenSplitscreenDisabled) to overlay the player layers, instead of culling out all player layers except for player 1.

• Fixed a regression that caused the editor to crash when attempting to place a cooked Actor-based Blueprint class via drag/drop.

• Fixed a memory leak when trying to trigger the display of a FCanvasBatchedElementRenderItem without a primitive to draw.

• Fixed an issue where SearchableComboBox couldn't be set back to the same value after resetting to default.

• Fixed an issue where SCommonButton wouldn't release when it loses focus

• Fixed a rare crash in SlateRHIRenderer due to both main thread and render thread possibly writing to the same arrays simultaneously.

• Fixed a situation where the Asset Dialog hotkeys either didn't function, or operated on the wrong widget.

• Slate: Fix SStackBox not respecting the Orientation slate arg.

• Fixed various possible crashes and bugs when importing offline fonts.

• Fixed Content Browser columns appearing as sorted after you click on their headers in the column view even when they are no longer the active primary or secondary sort columns.

• MetaSounds WaveAsset: Removed create new asset actions for unsupported assets.

• CommonUI:

  • Fixed not being able to click buttons with Virtual_Accept while binding hold actions to Virtual_Accept.

  • Ensure UCommonInputPlatformSettings load is done at the right time to avoid a synchronous load flushing async load request. Now PostLoad will be called as expected for all UPlatformSettings.

  • Fix persistent action bindings not always being registered as persistent actions.

• Fixed custom dialogs non-deterministically aligning their buttons.

• Fixed an issue where FQuat variables always displayed with the name "Rotation" in the details panel, regardless of DisplayName metadata or the variable's actual name. This fix ensures that the intended name is respected and shown properly in the UI.

• Fixed a typo in BoxElem.h

• Prevented Pin Value Inspector Tooltips from using global invalidation, as it can cause broken tooltips or crashes in some scenarios.

• SlateIM:

  • Fixed a case where child rows would not get removed when no longer drawn.

  • Fixed Viewport roots preventing mouse input for the whole viewport.

• Fixed an issue in the ListView Widget where OnEntriesGenerated would fire for each entry instead of firing once all entries are generated

• Fixed a crash in SObjectWidget OnFinishedPointerInput missing CanRouteEvents that causes nullptr access.

• Fixed Message Log not displaying when failing to save packages.

• PropertyPermissionList: Fixed buttons not appearing for functions marked CallInEditor details panel unless added to AllowList explicitly.

• Fixed an issue where users can't type polish letters s and a (with a tail) into the text input.

• Fixed an issue with Slate Screen Reader at initialization of the plugin.

• Add missing validation check with enabling or disabling SWindow.

• UMG Viewport: Made sure we EndPlay on the preview world during teardown.

Deprecated:

• Deprecated SCustomDialog VAlignButtonBox since it didn't affect the button layout, but could result in the button rendering outside the dialog if VAlign_Center was used.

UX

New:

• StylusInput: Added MacOS support.

• Change the default of bUseLinkedOrthographicViewports to `False`.

• Simplify the camera speed settings to just expose the camera speed. Min/max values are still exposed in settings.

• Slice graph connections by alt+middle-mouse dragging in the graph editor.

• Fix a bug where viewports could control the movement of a locked actor in a different viewport.

• Added support for direct manipulation of editor viewport orthographic near & far planes.

  • Added a new Editor Viewport Depth Bar that provides visual control over those planes.

• FDateTimeStructCustomization now has a tooltip. Hovering over a DateTime property's text box in the editor provides a hint at the format.

• Disabled use of a Template SoundWave, can be re-enabled in Editor Preferences->Audio Editor Per Project Settings.

• Switched to camera-relative vertical panning by default. Add an option for world-based vertical panning.

• Waveform Editor:  Instated Waveform editor as the default SoundWave editor.

• Splits viewport panning logic so that the middle mouse button and the left+right mouse button gestures are distinct. Middle mouse can be camera relative (and continues to be so by default) while left+right mouse button always move up and down.

• Outliner: Added visibility function versions that work on the selected actor's hierarchy and set H to default to toggle selected hierarchy.

• Asset Picker Size Scaling as Editor Preference: Added the Editor Setting "Scale Asset Picker Widget Size" to allow the size of asset pickers to be scaled up or down.

• Added a new "Toggle Selected Actor Visibility" command & behavior. This command takes the default "H" binding from "Hide Selected Actors". The command:

  • Hides selected actors if any actors in the selection are visible.

  • Shows selected actors if all actors in the selection are hidden.

  • Does not affect selection.

• Show template projects from all plugins:

  • Problem:

    • New Project dialog only listed template projects from enabled plugins Users couldn't see or start from templates included in installed but disabled plugins.

    • Empty/invalid background image paths in template categories showed broken visuals

  • Solution:

    • Updated search to include template projects from all discovered plugins Added warning icon + tooltip for templates from disabled plugins.

    • Selecting a disabled plugin template shows a warning/error box that the plugin is not enabled.

    • Warning is non-blocking (no modal), project creation proceeds after user confirmation.

  • Notes:

    • Keeps behavior lightweight.

    • Surfaces risk (no additional modal asking to confirm creation) but doesn't block flow.

Bug Fix:

• Ensured that the "Hide Selected At Startup" action now correctly applies to all selected actors, regardless of their current visibility state. Previously, actors that were already hidden were skipped by this action. With this change, both visible and non-visible actors will be consistently marked to start hidden on load.

Foundation

Build

New:

• AssetManager, AssetRegistry: Add Property AffectsCookRule to ManageReferences.

• Extended the AddExternalImportValidation of missing UClass imports to validate imports of all native types.

• Added support for the 'Activate' flag in PluginReferenceDescriptors. This fixes an issue where the 'Activate' flag would be deleted from plugin descriptors when running some UAT programs.

• IncrementalCook is now enabled for DLC cooks, but for DLC cooks it is still experimental and is not yet robust.

• UHT: Added support for engine version comparisons as preprocessor conditions.

• Prevented Clang builds for Windows from launching multiple link jobs simultaneously to avoid memory exhaustion.

Bug Fix:

• DLC Packaging: Fix missing .upluginmanifest when packaging without -DLCPakPluginFile.

  • With the plugin manifest present the output folder from a DLC package can be copied into a packaged game as-is and will load through the default plugin discovery and loading process.

• SavePackage: Fix errors in IllegalReferences diagnostic; it now more accurately finds the object and property that caused the illegal reference.

Core

New:

• Added UE::CFloatingPoint concept.

• Added value hashes and sizes to DDC replays

• RemoteObjects:

  • Transactional RPCs can be rescheduled per Actor. This means the transaction can abort and try other transactions while we wait for needed dependencies to service the RPC.

  • TimerManager now has some limited transactional support.

  • Exposed GetClass that may skip migrations when used with FRemoteObjectId.

  • Exposed GetRemoteId() on TWeakObjectPtr

  • Distinguished between Loaning out an Object and Reassigning a Borrowed Object. This helps clarify some situations, particularly where you're sending an object and maintaining ownership you can just check if you're Loaning it now, because ReassignBorrowed is now a separate case (which means another server has borrowed it, but you never owned it).

• Allow third-party crash handling to use `FAdditionalCrashContextStack`.

• Default WindowsPlatform.bClangStandaloneDebug to true. This slightly increases pdb size when compiling with clang, but improves debugging experience.

• FStateGraph and FStateGraphNode no longer timeout if -NoTimeouts is provided on the command line.

• Added [[nodiscard]] to mutex functions.

• Added [[nodiscard]] to TLess, TGreater and TEqualTo.

• Optimized TCppStructOps vtables to only include functions that will be called. This now prevents users from making UScriptStruct or TCppStructOps a friend in order to allow your class only constructible by the CoreUObject system.

• Refactored FInstancedPropertyBag's CopyMatchingValuesByID function to allow the caller to provide a matching function. Added CopyMatchingValuesByName that matches properties by name instead of ID.

• Added FRecursiveWordMutex to support very early and/or very late recursive mutex usage.

• Removed LLM dependencies on FCriticalSection and FRWLock.

• Eliminate static log records in the absence of source location and log tracing to reduce program size.

• Made mutating EnumClassFlags functions usable in constexpr contexts.

• Added UE_LIFETIMEBOUND to TValueOrError.

• Exclude trace state when log trace is disabled and optionally compile out source location from logging to reduce program size.

• Use Yield() instead of YieldThread() when spinning in mutexes to improve performance under heavy system load.

• Optimized ParkingLot::Wait when there is no timeout.

• Added UE::CContiguousRange and CPointer concepts.

• Added CCharType concept and applied it in TStringView.

• Added Max() functions to sets and maps - and TSparseArray which is needed for sets.

• Replaced TSortedSet's O(N^2) Append with an O(N) (at best) or O(N log N) (at worst) and added tests.

• Added some basic TSet tests, based on the existing TMap tests.

• Specialized FPlatformManualResetEvent for each platform that we target.

• Added FOutputDeviceFence to support lifetime management of dynamic log records

• Updated debug visualizers for TDeque, supporting visualisation of elements when the container is set up to use a different allocator such as TInlineAllocator or TFixedAllocator.

• Add explicit nullptr constructor/equality operators to TWeakInterfacePtr Mark functions in TWeakInterfacePtr [[nodiscard]]

• Fixed overallocation for unused null terminators in TStringBuilder.

• Added TFunctionWithContext to adapt a callable into a function pointer and context

• Improve accuracy of GC time limit by setting object destroy granularity to 10 (instead of 100) and provide a way for it to be tweaked per project with gc.IncrementalBeginDestroyGranularity.

• Optimized ParkingLot callback code generation

• Updated UE::Core::Private::StringLength to use TCString::Strlen outside of a constant-evaluated context, to speed up compile times with MSVC.

• Added UE_IF_CONSTEVAL and UE_IF_NOT_CONSTEVAL.

• Updated Oodle to 2.9.14.

• Used InitializeCriticalSectionAndSpinCount to avoid an extra function call during construction of FWindowsRecursiveMutex.

• Added CConvertibleTo concept mirroring std::convertible_to.

• Added a configurable intrusive unfair non-recursive mutex.

• Added TInstancedStruct::NetSerialize function.

• Removed contention on root flags when pinning weakobjectptrs.

• Improved the logging backlog to minimize the number of missed log lines during the initialization.

• Added TLogTemplate and control over log template allocation.

• Added IsLocked and IsLockedShared to the mutex types.

• Add Async.ParallelFor.DisableOversubscription which if enabled will only use existing threads which can be faster when cores are saturated.

• Added support for nested $format in structured log formatting.

• Added Intel OneAPI and Microsoft Clang 19 HWPGO integration.

• Added an ExecFileOverride resource to BootstrapPackagedGame.

• Optimized FLazyName to support constant initialization.

• Deflate, gzip & lz4hc compressors now honor COMPRESS_BiasSpeed and COMPRESS_BiasSize

• Added TExternalStringBuilder and support for TStringBuilder<0>

• Improvements to GameFeaturesSubsystem and FPluginDescriptor:

  • Added a new hook to PluginDescriptor to allow customized loading of uplugin json data.

  • Updated GFS to ensure that, at least in the editor, we will try to use the PluginManager's copy of the plugin data rather than re-reading it and deserializing it from json ourselves. This is necessary to take advantage of the customized loading.

• Enabled custom crash handling for GPU crashes.

• Optimization for FSoftObjectPath::ResolveObjectInternal to avoid the round trip to/from string.

• Add a console command, core.ResetEnsureState, to reset the ensure state so they fire again. This will cause all non-always ensures to trigger again if they've already been suppressed.

• Reduced memory use by FOutputDeviceFile by 992 KiB in the default configuration.

• Added better error messages when TLess, TGreater and TEqualTo when used with a type without the corresponding operator.

• Now validate LinkerSave unmapped objects against the package harvester excluded object list. This removes the limitation of asserting when FindObject is called while GIsSavingPackage is set.

• FPaths:CreateStandardFilename: changed behavior to normalize paths that cannot be standardized: .. is collapsed when possible.

• Added UE::CNotCVRefTo concept.

• Removed dependencies on ParkingLot from Windows stack walking

• Made the MSVC implementations of FPlatformMath::CountLeadingZeros and FPlatformMath::CountTrailingZeros constexpr.

• Added format string validation to LowLevelFatalError.

• Added UE::CStringViewable and UE::CCompatibleStringViewable concepts.

• ThinLTO is now enabled by default for Clang based toolchains.

• Added an experimental plugin, Global Configuration Data, that can be used as a single point of access to data that may be provided from different systems.

  • Can be used to have console and config data added to blueprints without additional code.

  • Additional data routers can be registers to expand on what data sources are available to the system.

• Added UE::CArithmetic concept.

• Added UE::CCompatibleCharType concept and some usage in TStringView.

• Added UEOps.h to aid in the correct generation of all binary comparison operators based on a couple of simple member function definitions.

• Replaced the UTF8CHAR enum with C++20's char8_t.

• Added checks for non-trivially-relocatable types being used in containers, particularly FGCObject-derived types.

• Added UE_REWRITE, a replacement for FORCEINLINE intended to be used on macro-like functions (rather than for optimization) by 'rewriting' a function call as a different expression.

• Enabled override max printed reference chains via `gc.MaxReferenceChainsToPrint` Cvar.

• FVector2D deprecated comparison operators (from 5.2 onwards) removed.

• Remove deprecated FLinearColor methods, deprecate unused DXT block structs.

• Enabled TSharedPtr and TUniquePtr to be usable as keys in sorted containers, and TUniquePtr to be usable as keys in hashed containers.

• Added std::initializer_list support to TSparseArray.

• Fixed UPS cooking indeterminism for TBox[2] structs on stack Make ForceInit constructor zero out padding.

• Fixed managed storage handle attempting to resolve an unmanaged file more than once after the manager becomes active.

• Added UE::CDerivedFrom concept.

• Added debug visualizers for UE::Math::TVector2<> and FDeprecateSlateVector2D.

• Extended `gc.PerformGCWhileAsyncLoading` to provide the option to garbage collect while async loading, only when low memory is detected (based on gc.LowMemory.MemoryThresholdMB).

• Package flags are now thread-safe.

• Add TargetRules.bIdenticalCodeFolding setting (--icf=all).

• Added intrusive unset optional support to TNotNull.

• Added a benchmark for mutex types.

• Added CSameAs and CDecaysTo concepts.

• Added UE::CIntegral concept.

• Added tests for Algo::StableRemoveIf.

• Added configs managing how GenericPlatformMallocCrash handles allocation requests on non-crashing threads, allowing them to permanently suspend on allocs/frees, suspend on allocs and skip frees, or process as normal.

• Removed dependency on FCriticalSection and ParkingLot in memory allocators.

• Retry in the shared mutex TryLockShared while there is not an exclusive lock.

• Added support for joining non-contiguous ranges in TStringBuilder.

• Added support for optional sub-object references in localized structured log formatting.

• Reduced codegen impact of ensure() macro.

• Added an overload of CreateLogTemplate that takes the format as FText.

• Added support for $locformat in structured log formatting.

• Added NotNullGet for retrieving the inner value from a TNotNull without an explicit cast.

• Experimental Visual Studio 2026 support.

• Added a new experimental API: SpringMath:

  • This includes some useful functions for critically based spring damping

  • Added experimental blueprint library for spring math to expose functions to BP

  • Added SpringMath::ExponentialSmoothingApproxQuat to mirror the existing function FMath::ExponentialSmoothingApprox.

• Added support for creating Property Bag Placeholder types for entity prefabs.

  • This is done via a new table added to package files: ImportTypeHierarchy table.

  • Each entry of that table contains hierarchical information for every FObjectImport entry that is a type (e.g., UClass).

  • This is the second part of a 2 part change. The first change introduced the package file header change along with the object version bump.

  • This change adds the remaining logic to save/load the new table and the change to use it when creating placeholders.

• Added support for AVX10.

• Added write helpers to RapidJsonUtilsAdded UE::Json::WriteCompact and UE::Json::WritePretty, to write a UE::Json::FDocument to a FString in either compact or pretty form.

• Added UE::Json::MakeStringRef and UE::Json::MakeStringValue to help convert a FStringView to a UE::Json::FStringRef or UE::Json::FValue when building a JSON DOM.

• Added some additional aliases to UE::Json that are needed when building a JSON DOM.

• Switched UE::Json aliases to use the UE FMemory allocator, rather than rapidjson::CrtAllocator.

• Added --prioritize-dependency-scanning SN-DBS build option.

• Added `FNonshrinkingAllocator`, which changes the shrinking policy to No by default.

• Added hidden MetaData works for base structs in Instanced Structs.

• Cooker:

  • CookPackageSplitter: Changed the return value of GetGenerateList to a struct (and changed the name to ReportGenerationManifest) so that generators can request that the package containing the generator be not saved.

  • Deprecated the ability to run the cook inside the editor process when launched from editor. The cook instead should always be executed in a separate invocation of the CookCommandlet. This has been the default since 5.3, and we are now deprecating the ability to change that default and will remove all support for it in 5.9.

  • Added the following commandline arguments:

    • -cookshowremaining

    • -cookshowpackagenames

    • -cookshowinstigators

    • These provide a clearer behavior than -dpcvars=cook.displaymode=1|2|4.

    • Each flag can be specified with a value: -cookshowremaining=1|0, or with no value, defaulting to 1: -cookshowremaining.

    • These flags override whatever value has been assigned via config or -dpcvars commandline.

• Introduced a mechanism for render asset updates to be abandoned by owning `UStreamableRenderAssets` so `UStreamableRenderAssets` can be garbage collected independently (See r.Streaming.EnableAssetUpdateAbandons). Abandoned render assets are ticked during GC or every streaming update if r.Streaming.TickAbandonedRenderAssetUpdatesOnStreamingUpdate is true (defaults to true).

Bug Fix:

• Changed FMonotonicTimeSpan::IsInfinity() to stop matching negative infinity.

• Fixed FMath::FindDeltaAngleDegrees and FMath::FindDeltaAngleRadians for input deltas outside [-540, 540] degrees.

• COMPILE_WARNING reports as error when WarningsAsErrors is being used.

• Fixed a potential infinite loop in the serialization of packed ints when loading malformed values.

• Fix potential deadlock in the scheduler if a foreground task is scheduling a background one.

• Fix potential deadlock in object annotations because of 2 different locks used in different order.

• Made -VerifyGC and -NoVerifyGc take all verification cvars into account.

• Fixed invalid access to memory location error in UnrealBuildTool.

• Made sure that pinned UObject are preventing GC of clusters they are part of.

• Fixed composite EPackageFlags not being shown in the debugger, caused by non-power-of-two enumerators.

• Fixed _GetUObjectPacked intrinsic for debug visualizers. This addresses an issue with visualizers for weak object ptrs not working in builds where UE_ENABLE_FUOBJECT_ITEM_PACKING == 1.

• Made TBox's InverseTransformBy and TransformProjectBy both check for box validity before transforming (matching TransformBy).

• Fixed issues trying to load redirected native classes using the StreamableManager (and AssetManager).

• Fixed a bug in GC timing where if it destroyed exactly 100 objects in a frame it could cause a large stall.

• Fixed many log categories having a default verbosity higher than their compile-time verbosity.

• Fixing a crash in CppStructOps caused by unloading a dll at an inopportune time resulting in a dangling pointer to a vtable.

• Fixed TMemoryWriter IndexSize to be a bit count.

• LaunchEngineLoop: Fixed a copy paste mistake in the error message, it now correctly identifies that it fails to load the Game Engine class instead of the Editor Engine class when instantiating GEngine.

• InstancedStruct: Fixed the operator= when copying from a TConstStructView.

• The loader will now flush any remaining async loads before PreExit to avoid async loading to perform operations past the exit point.

• Fixed UE_STATIC_ASSERT_COMPLETE_TYPE for zero-sized arrays.

• Enabled seeking to the end of a response body without returning CURL_SEEKFUNC_FAIL in the Curl implementation in DevHttp module.

• Fixed UI layout for a particular view of the crash report dialog where the screenshot preview can cover button controls.

• Fixed clang miss-leading indentation warnings.

• Checked zlib init and shutdown for errors.

• Cleaned up usages that expect nullptr_t to be in the global namespace.

• Fixed StaticDuplicateObject when Source Object class and Destination class are different.

• Fixed crash when loading content from corrupted pak or optional segment files.

• Disabled nuget audit for the dotnet Development configuration to prevent unactionable dotnet build errors.

• Force synchronous writes on type library input files.

• Fixed pipe and task timeout calculations that generated bad code.

• Deferred invoking the class initializer on duplicated objects until after subobject instancing has occurred.

• Disable 'C4702: unreachable code' when use bUseInlining is disabled.

• Fixed potential race condition in FConfigCacheIni::ForPlatform adding plugins without holding the lock.

• Fixed text import of delegate properties with full object paths, and made FDelegateProperty consistent with FPropertyMulticastDelegate on text export.

• Added static_asserts to TValueOrError to ensure that it's not instantiated with references.

• Fixed a FARFilter with only WithPackageFlags or WithoutPackageFlags set failing to return any assets from IAssetRegistry::GetAssets(...).

• Avoid TInstancedStruct::GetPtr/GetMutablePtr and TStructView/TConstStructView::GetPtr crashing when the underlying struct data is incompatible with BaseStructT

  • This will now ensure instead, though will still perform the bad cast in a shipping build, so any ensures need to be fixed!

• Fixed TStringView::CopyString for copying an empty range.

• Fix a missing test of MaybeWaitingFlag in FManualResetEvent before parking the thread.

• Fixed Algo::RemoveIf calling the predicate too many times in some cases, and added some tests.

• Rehashed map and set properties after instancing key subobjects in their overrides of FProperty::InstanceSubobjects.

• Disabled AutoSDK for LowLevelTests targets.

• Fix thread scheduler to properly apply the cvars TaskGraph.UseDynamicPrioritization, TaskGraph.UseDynamicThreadCreation, and TaskGraph.OversubscriptionRatio which can be used to modify thread performance.

• Adding -nocrashreports support for windows. When provided, we will log crashes/ensures/etc but will not perform more complex reporting that could risk hanging on a file pipe.

• Reimplemented TVectorRegisterType with partial specializations rather than std::conditional_t to work around alignment issue using Clang on Windows.

• Disabled custom property lists during native struct serialization.

• Fixed a race waking threads in FSharedMutex and FSharedRecursiveMutex.

• Added workaround for getting an array reference element from an rvalue tuple under MSVC.

Deprecated:

• Deprecated Alignment in TStaticArray and fixed UB behavior in it's GetData. Made TArrayView and Invoke constexpr.

• Deprecated TSortedMap::GetMaxIndex, fixed TSortedSet::GetMaxIndex and correctly commented TSet::GetMaxIndex and TMap::GetMaxIndex.

• Deprecated public and protected ways of initializing TStringBuilderBase from a buffer.

• Deprecated member TFunction::CheckCallable which was never intended to be public.

• Deprecated TIsConst.

• Deprecated PLATFORM_COMPILER_SUPPORTS_CONSTEXPR_BUILTIN_FILE_AND_LINE.

• Replaced bExactClass with EFindObjectFlags in the FindObject family of functions.

• Deprecated the original log template API.

• Delete FCbFieldIterator::MakeOwned() to avoid breaking the iterator.

Dev Tools

New:

• Added compile warning argument ordering.

• Wildcard support in project sections of UGS ini files.

• Improved the summary outputs of UnrealPak. The units of memory now scale with the number of bytes making it easier to read for both smaller and larger containers.

• UBT DefaultBuildSettings:

  • Build Settings V6 now applied to wundef.

  • Default Build Settings Updates for Targets - V6 - engine.

• BuildCMakeLib: Added support for building third-party projects with CMake using the Ninja build system.

• Adding capabilities to the warning defaults, cleaning up tests, adding more warning+error strings for easier long term adoption & toggling.

• UHT will flag U macros (i.e. UCLASS) found in skipped blocks of code as deprecated. This will be made a warning in a future version of UE.

• UBT Editor: Added graceful messaging for Target upgrade requirements on editor path.

  • Emit the target build settings version & build environment to target file for editor runtime consumption.

  • Consume target file metadata to improve error messaging for Target versions.

Bug Fix:

• Fixing a bug where UAT could hang waiting for output. We now log a warning instead.

• Shaders: Fixed the shader pipeline skipping work if the number of shaders to compile is less than the number of tasks available.

• Fixed an issue where if a TInstancedStruct is used as a function argument, Clang platforms would fail to compile.

• Fixed BuildCookRun to include base build .sig files when generating patches.

• Updating UHT to once again generate an error when a USTRUCT contains more than one base.

• Fixed an issue in UnrealVS that could cause UnrealVS.P4->History to open an empty window

• Updated UnrealVS - Includes fixes to test discovery and execution

• Corrected define usage (UE_BUILD_SHIPPING vs UE_SHIPPING)

• Fixed UHT parser issue where if FArchive is forward declared when used in the Serialize function declaration, UHT would fail to generate the proper code.

• Fixed inconsistent exception logging in Gauntlet.TestExecutor. It now consistently uses Exception.ToString().

• Fixed issue in UHT where it was allowing a USTRUCT to have multiple USTRUCTs as base classes.

• Fixed a bug where presets would be added to the global sync filters if the tab with the preset had its sync filter view opened and the okay button pressed.

• Fixed UGS not showing investigations as "resolved" when using Horde's metadata endpoint.

• Fixed destination files potentially not having the correct permission during SafeCopyFile in UAT, on non-Windows platforms.

Horde

New:

• BuildHealth Server Build: Added JobSummary telemetry.

• Hashed issue handler will now automatically check for a file property in the event's structured logging, and use that data in suspect finding. This should lead to suspect changes being identified more accurately, but relies on emitted warnings and errors including file metadata.

• Analytics:

  • Added a Build Health Dashboard View that shows step outcome history for selected templates & streams.

  • Add ExternalIssueKey & Fingerprint to the telemetry payload for issues. Also includes AnalyticsIntegrationTests.

• Added example of implementing a new Secrets Provider for Azure Key Vault. This secret provider is experimental and provided as an example of how to implement a custom secret provider.

• Added Secrets plugin configuration option WithAws that controls if the AwsParameterStore provider is enabled.

• Added new Secrets API api/v1/secrets/resolve/ that resolves a string to a property value of a secret. For example the string horde:secret:SecretName.PropertyName would resolve to the value of PropertyName for the secret SecretName.

• Only commits with Code CommitTag are considered when searching for Compile issue suspects.

• Removed the unused Password property from EpicGames.Horde.Streams.IWorkspaceType.

• Added the attribute ResolveSecret that allows properties in the Global Config to be resolved to the value of a Horde secret during configuration load.

  • If the property's value is of the form horde:secret:SecretName.PropertyName then if a secret SecretName exists and has a property PropertyName it will be replaced with the value from the Horde secret.

  • This allows sensitive configuration properties to move out of the configuration files to an external secrets provider such as AWS or HashiCorp Vault.

  • New: Updated the Password and Ticket properties for the Build Config's PerforceCredentials property to use the attribute ResolveSecret allowing Perforce credentials to be moved to an external secret provider.

• Changed build graph updates where a node that is skipped but modified does not fail the whole build. This allows the build to continue with only dependent nodes being marked as skipped while non-dependent subtrees can continue to run.

• Replaced the deprecated code coverage tool JetBrains.dotCover.GlobalTool with JetBrains.dotCover.CommandLineTools.

• Added to the Stream Config a StreamTags property, which is a set of name and Boolean pairs; and to the Schedule Config a Condition property.

  • The Condition property can be used instead of the Enabled property to control if the scheduled jobs for a stream should be enabled.

  • Each stream tag will have an environment variable named after it with the UE_HORDE_STREAMTAG_ prefix and a value of True or False, which can be used in BuildGraph script conditions.

• Fixed an issue where capabilities for agents was missing their RAM capacity.

• Updated Temp Storage to allow the maximum number of exports to write in a single request to be configurable from the agent settings. The new option is TempStorageMaxBatchSize and defaults to a value of 20. Modified from contrib .

Bug Fix:

• API encounters ".NET type System.Text.Json.JsonElement cannot be mapped to a BsonValue" on swagger API invocations.

• Fixed an issue where GetNext for ScheduledDowntime would return the previous downtime.

• Fixed an issue where the log for the Downtime Service would print the next downtime being in the past when an expired non-repeating downtime was in the global config.

• Server Tests: Fix the DatabaseIntegrationTest class to properly forward dispose calls to the mongoDBRunner.

• BuildHealth Server: Exposed DateUtc on GetCommitResponse.

• Fixed an issue where capabilities for macOS agents was missing information for:

  • CPU number of logical cores.

  • CPU performance and efficiency cores for Apple Silicon.

  • GPU name and core count.

  • User name, domain name and running as administrator.

• Fixed an issue where the Notices Get method would not return the start and finish times, and if the start and finish times are set then set the active value accordingly.

Insights

New:

• Adds pre and post state change callbacks for TraceLog channels. Allows instrumentations to deny state changes and provide a reason for the denial, as well as performing actions when a channel is enabled or disabled, such as sending initial state, resetting tracked state or activating tracking.

• Added a method of creating a TraceAnalysis session using a custom data stream.

• Added an ability to copy a tooltip value to clipboard from the bookmarks track.

• The PlatformEvents channel now uses callbacks to deny enabling channels and provide user feedback, if requirements are not fulfilled.

• Added support to save data traced via the Direct Trace mode to disk. FDirectSocketStream can now accept an optional FArchiveFileWriterGeneric used to write the data to disk.

• Added support for Frame Start and End Misc Trace events in the minimal trace API.

• Added config variables to provide variable trace log write buffer size and prevent writer sleeping. This helps prevent the write thread from getting saturated under heavy load.

• Increased version of Unreal Insights to v1.08, for the UE 5.7 Release.

• Improved management of TraceLog worker thread in various scenarios. The worker thread can now be started on demand.

Bug Fix:

• Fixed a startup deadlock when launching with -trace=memory without tracehost or tracefile.

• Fixed an issue where FTraceAuxiliary::Relay did not respect the Options parameter provided.

• Fixed an issue due to Trace gap detection using three sync points. Previous logic used two sync points to calculate gaps, but the engine sends out three. In some scenarios this caused an error in gap detection which meant a higher serial was chosen as the next serial. This would leave much of the trace data unprocessed.

Framework

AI

Bug Fix:

• Fixed an issue where selecting subnodes would result in the currently-edited property value to be discarded instead of applied.

AI Behavior Trees

Bug Fix:

• Fixed reinstantiation for Blueprint-based nodes using blackboard key selector.

• Fixed Blueprint reinstantiation issues with some BehaviorTree types.

• AAIController::UseBlackboard: Fixed to correctly return the result of trying to initialize the Blackboard.

• Changed InstanceIdx to use a const int32 to prevent a need for IntCastChecked to prevent possible data truncation.

AI Debugging

New:

• Added possibility in Rewind Debugger tracks to override the default behavior to step backward and step forward commands.

• VisualLogger log entry initialization can now also assign a valid location for components. With this change, double-clicking on such an entry will bring the camera to that location instead of the world's origin.

• Fixed GameplayDebugger local-multiplayer render duplication.

Bug Fix:

• Fixed ever growing buffer in FVisualLoggerBinaryFileDevice when VisualLogger is not set to record to file.

• Fixed debug draw helper functions and SmartObject visualization to properly handle scaled DPI.

AI EQS

New:

• EnvQueryTest_GameplayTags: Added searching for tags container in actor's components if actor itself doesn't implement IGameplayTagAssetInterface.

• Upgraded the description details of the UEnvQueryTest_Pathfinding test to better reflect its behavior in EEnvTestPurpose::Score mode.

Bug Fix:

• Fixed blueprint reinstantiation for EQS types

AI Navigation

New:

• NavLink Generation:

  • Added a name property to generation configs, and JumpMaxDepth can now be negative.

  • Activated the "enable" property now that multiple configurations are supported.

  • Added multiple link configurations for generated navlinks.

  • Added LinkGenerationSelectedConfig to debug a specific config.

  • Improved trajectory ground sample debug display.

• GameplayDebuggerCategory_Mass: Now draws a purple circle around entities that are LOD off.

• AsyncNavWalkingMode can use navmesh normal instead of physics hit normal.

  • Now always take the highest hit location in z when searching for ground location.

• Mass Navigation:

  • Added text to MassNavigation::Debug methods.

  • Added an option to avoid slowing down when steering.

  • Added a MassSceneComponentVelocityTranslator to copy velocity between mass entities and actors.

  • Updated NPC desired movement based on current velocity when in animate mode for root motion driven NPCs. This helps with smooth blending into animated states from steering when character is root motion driven.

  • Added navmesh path boundaries to mass gameplay debugger.

  • Added logs in the navigation flow.

• Mass Entity: Fixed an infinite loop caused by loop variable overflow ().

• NavMesh: Added a navmesh tile building optimization when using CompositeNavModifiers with lots of data.

• Mass Navmesh Navigation: Increase default corridor width used by FMassNavMeshPathFollowTask.

• Pathfind: Changed warnings to logs when InitPathfinding can't find a polygon at the start or the end location.

• Removed deprecated 5.4 navigation code.

• MassNavMeshPathFollowProcessor: Improved logging information and clamping distance on the closest segment.

• MassNavMeshPathFollowTask: Removed overlapping points when building a corridor.

• Mass Navigation and Avoidance:

  • Made a fix to apply max speed in UMassApplyForceProcessor.

  • Added debug to display standing entities in mass avoidance.

  • Pathfollow -> Made a fix to keep the steering force when near the end of a path (we want to apply the fade only on the avoidance forces).

  • Used stronger avoidance forces when getting out of environment boundaries.Added an optional tag to prevent moving backward while avoiding.

• Navigation: Added in the output log information regarding invalid pathfind requests and changed log verbosity from error to warning.

• NavigationSystem: Replaced legacy repository unregisternavrelevantobject method with UnregisterNavRelevantObjectInternal.

Bug Fix:

• Navigation:

  • Fixed a crash occurring when building navmesh on PIE ending.

  • Made a tentative fix for a crash occurring when navigation is being rebuilt because a navigation override is being removed when clearing world components.

  • Update SplineNavModifierComponent to apply the NavAreaToReplace to its modifier.

  • Guarded against zero DeltaTime in UPathFollowingComponent::FollowPathSegment to prevent division by zero ().

• NavLink Generation:

  • Fixed missing links on small navmesh patches.

  • Made a fix to avoid filtering overlapping links if they used different navigation areas.

  • Fixed automatically generated navlinks being created without the NavLinkFlag.

• NavMesh:

  • Made a tentative fix for a rare crash in storeWallSegment.

  • Fixed assertions occurring in UE::NavMesh::Private::CalculateMaxTilesCount().

  • Fix FindDistanceToWall returning incorrect result and finding a closest position that is not on a wall.

  • Fixed editor crash when a large number is typed in the Agent Radius value.

• ISMC: Fixed an ensure in UInstancedStaticMeshComponent::GetNavigationBounds() caused by invalid navigation bounds. CachedBounds were being invalidated and not being recomputed when instances were added individually.

• ZoneGraph: Fixed problem with converting FZoneGraphTag::None to FZoneGraphTagMask ().

• Fix for AsyncNavWalkingMode using stale normals.

AI Smart Objects

New:

• Added method to retrieve a Smart Object slot's UserData from the SlotView.

• Added basic MRU slots implementation for MassSmartObject with settings in Mass SmartObject section of the project settings:

  • MRUSlotsMaxCount: Possible values between 0 and 4 (default: 0, meaning that the feature is not used; up to 4 slots).

  • bUseCooldownForMRUSlots: to allow the most recently used slots to be considered again a given period of time.

  • MRUSlotsCooldown: period of time during which a given slot will not be considered after being used.

• Added all camera controls to the SmartObjectEditor toolbar

Bug Fix:

• Fixed a crash in AITask MoveTo

• Fixed an issue where the NavNodeRef was not included when requesting the slot entrance location with the option for projecting to navmesh enabled.

AI State Tree

New:

• Added a rule to remove sustained state. All reselected states are new states.

• Added Blueprint helper 'RunStateTreeRunStateTree' to execute a StateTree on an actor. Helper will use an existing StateTree component or add it if necessary.

• Added Multiply operator to the Consideration score calculation.

• Added ExecutionExtension callback when a transition is about to be applied.

Bug Fix:

• Fixed a Runtime Validation false positive error when changing state trees without running any.

• Fixed a transition that didn't remove the frame when a sub-frame changes root.

• Prevented a reentrant call into StartTree and Tick for StateTreeComponent and GameplayInteractionsContext.

• Fixed temporary frames not cleaned up when we run multiple transitions and did State selection more than once.

• State tree references can now change while the tree is not run.

• Fixed editor freezing when the user spams undo/redo operation inside State Tree Editor.

• State Tree Editor: Hide level actor picker in the state tree editor.

• Fixed property function node value not being retained in new nodes when copied/pasted/duplicated.

• Fixed property bindings not being retained in new nodes if the old bindings were removed before pasting.

• Fixed details view not always syncing correctly with the selected editor node.

• Fixed Delegate Listener being unable to bind to the nested Delegate Dispatcher.

API

New:

• Added DrawDebugCircleArc version accepting a quaternion for orienting the arc with an arbitrary roll.

Bug Fix:

• SlateIM ComboBox now properly shows its selected value when spawned.

Audio

New:

• Waveform Editor:

  • Added a noise threshold for zero crossing logic.

  • Added an inverted S fade function.

  • Streamlined the trimming workflow to have new UI handles and be enabled on opening the waveform editor.

  • Added loop, delete, and conversion options when right clicking.

  • Playback hotkey adjustments to allow move playhead to start

  • Added an icon to fade handles.

  • Made adjustments to default nudge settings.

  • Added controls to scroll left and right when zoomed using the right mouse button.

• Made memory improvements for MetaSounds in the Operator Cache.

• Added a Fade Node in MetaSound Experimental.

• Added Blueprint equality operator for MetaSound literals

• SoundWave Cue Point Origin now has improved defaults. Default origin is now the Waveform Editor Transformation Markers, unless the .wav had cue points on import.

• Added a new Virtualization Mode: Seek Restart. This mode will virtualize, but keep track of playback time and, when realized, seek to that time as if it was playing the whole time. It's a less accurate, but more performant alternative to Play When Silent.

• Performance improvements when using and destroying a large number of Quartz subscribers.

• Metasound Trigger Filter node display name is now Trigger Chance to better convey its meaning. Some of its advanced pins are now hidden by default, and the node & pins tooltips have been made clearer.

• Added "MaintainAudioSync" input to Wave Player Node as an advanced input to the Wave Player MetaSound Node.

  • "MaintainAudioSync" will compensate for latency during playback of streaming wave assets so that the playback of the audio stays in sync within the playing MetaSound.

• Added a new debug display for Audio Modulation: au.Debug.Modulation.ActiveMixes

  • This will display all currently active mixes.you can choose whether Global Control Bus Mixes are included with au.Debug.Modulation.ActiveMixes.ShowGlobalMixes

• Both experimental and legacy subtitle fields are now initialized for DialogueWaves so users can switch between them.

• Added Subharmonizer MetaSound Node to standard library.

• Added an option to only support Vorbis decoding, not encoding, for memory-constrained targets.

• Renamed the "Create Subtitle" Asset Utility action to the more-specific "Make Asset UserData from Legacy Subtitles."

• Improved extendable MetaSound node configuration editor details customization.

• Added two new features to Control Bus Mixes:

  • Control Bus Mix Timer: Set a duration on the Control Bus Mix, and it will disable itself that many seconds after activating.

  • Retrigger on Activate: Optional behavior where, when a mix is activated when it's already active, it sets the values on the CBM to its default values and starts the attack over again (like retriggering an envelope).

• Added a new Asset Action Utility that enables converting Overlay assets into subtitles in bulk.

• MetaSound presets now inherit default metadata (ex. float range/clamp) from parent graph if applicable.

• Subtitles and Closed Captions plugin:

  • Multiple Subtitles can now be added to a single SoundWave. All of them fit inside a single Asset UserData.

  • No longer queues subtitles if the engine settings for subtitles are turned off.

  • Added an Enum to Subtitle Assets to distinguish when the duration property is relevant vs when it stops automatically using a sound's length.

  • Subtitles from now have a default priority of 1.

  • Subtitles created in a SoundWave's Asset UserData will automatically estimate the length of the sound and default their duration thereto.

  • Sequences now support dragging and dropping subtitles.

  • Changed the USubtitleTextBlock class name to USubtitleWidget.

  • Added automatic subtitle playback support for DialogueWaves inside SoundCues.

  • Added a Blueprint node for queuing all the subtitles in an Asset UserData at once.

  • Added a Blueprint function for hot-swapping the Widget.

  • Added StopSubtitlesInAsset BP function.

Bug Fix:

• Waveform Editor:

  • Fixed an issue where selecting a loop region marks the soundwave dirty.

  • Fixed an issue where highlighting and saving with a loop region selected disables the rest of the soundwave playing.

  • Fixed SoundWave markers with incorrect position data on export to USoundWave.

  • Scrubber Undo Fixes

  • Fixed frame length resetting to default instead of min when sliding loop region size.

  • Fixed exported soundwaves not supporting undo transactions.

  • Fixed ensure on undoing loop deletion.

  • Fixed editor crashing when closing out a Sound Wave asset after canceling to Export Waveform.

  • Fixed undo markers triggering ensure

  • Made UI fixes for markers with positive frame length

  • Made fixes to popup clearing.

  • Fixed right click getting stuck when scrolling waveform.

• Subtitles in the Subtitles and Closed Captions plugin with delayed starts now respect internal/external timing choices.

• Subtitles from the Sequencer plugin now correctly update their visibility when scrubbing along PIE.

• Fixed crash with MetaSound user preset widget tab.

• Fixed shutdown crash on Audio Streaming Cache handle ref counting.

• Fixed a bug where, when a submix is deactivated, Modulators attached to it would still be active.

• Fixed a bug where submixes with modulators could not disable via the Auto-Disable setting.

• Fixed an issue with the Seek Restart Virtualization mode where it did not properly account for changes in pitch before virtualization.

  • When the sound virtualizes, it will use the last pitch it was set to to estimate where it should seek upon realization.

• Sound Attenuation: Fixed == operator on FSoundAttenuationSettings.

• Fixed MetaSound relative render cost being incorrectly reported in some cases when using the operator cache.

• Fixed a bug where some Modulation inheritance settings were not working in some cases for non-volume modulation on sound sources.

• Fixed MetaSound comment node positions not saving properly after resizing.

• Fixed a bug where projects with the Audio Modulation plugin disabled had logspam.

• Fixed crashes when using MetaSound node configuration with pages.

• Fixed a MetaSounds edge case when the on-done trigger is triggered mid-buffer.

• Fixed a MetaSound crash when clicking audition menu after closing asset editor

• Fixed a bug where the Chorus Source effect modulation settings did not respond to Modulation changes.

• Fixed Sine Curves on FVolumeFader when used outside [0,1] range. They should now follow the expected curve between any two values.

• Fixed a bug causing various ITD features to have an enormous delay.

Blueprint

New:

• By default the Blueprint editor no longer searches for references to variables when the variables type is changed via the blueprint editor

  • To re-enable this behavior, set "bSearchForReferencesWhenVariableTypeChanged" to true in your editor settings.

• Can now call BlueprintFunctionLibrary functions from classes that do not implement GetWorld or ShowWorldContextPin. It now always shows the pins if needed and will always connect invisible pins even if they are marked as optional.

• Added a SetFocusInViewport node to UScriptableInteractiveTool. This means scriptable tools can give focus to the viewport so that key bindings pass through without user interaction.

• The Blueprint Debug Draw Line / Point / etc. methods now have the option to draw with 'screen' depth priority.

• Added ToRotationVector, MakeFromRotationVector and GetShortestArcWith to the Kismet Math Library.

• Structs tagged as HasNativeMake can now still have their individual members set.

• Asset/Actor Actions in Developer folders show for everyone.

  • GetBlutilityClasses already had code to ensure that we don't list other devs' blutilities.

  • However, it didn't use the correct path format, which caused FPaths::IsUnderDirectory to always return false.

  • Similarly, UEditorUtilitySubsystem::HandleStartupAssets never had a similar filter to begin with.

Bug Fix:

• Fixed failure to copy instanced Blueprint component value overrides on copy/paste workflows.

• CollectionsManagerScriptingSubsystem:

  • Removed a warning from GetAssetsInCollection when an asset could not be found.

  • Fixed an issue where logs displayed as red despite actually being warnings.

• Fixed an editor crash after clicking on a deleted graph node hyperlink in the Blueprint editor's compiler results tab.

• UK2Node_VariableGet::SetPurity erroneously removed the SetPurity function from the public API of UK2Node_VariableGet. This fix now re-adds SetPurity, but changes its implementation to use TogglePurity.

• Fixed an editor crash after clicking on a deleted graph node hyperlink in the Blueprint editor's compiler results tab.

• Fixed a crash when editing children from a cooked Blueprint that had editor-only components.

• User defined structs with Text fields with non-trivial default values no longer alter themselves on load.

• The Blueprint diff tool now reports changes to Create Event Node's signature function.

• Fixed potential for ICH override template namespace collision after reparenting an Actor-based Blueprint.

• The engine no longer crashes when it exits while a search in Blueprints is ongoing.

• Added more crash report context to paths where we are failing to resolve a node's owning Blueprint and/or graph, while using an ensure to avoid crashing the editor as a result.

Blueprint Compiler

Bug Fix:

• Fixed crash in SerializeUnversionedProperties during cooking.

• Fixed crash when cooking blueprints with local object references set to objects in asset.

• Fixed compiler failing to find newly added functions on Blueprint interfaces, which led to implemented functions being renamed.

• Fixed one cause of 'Reachable Garbage' when recompiling Blueprints.

• Blueprint's delegate signature checking logic no longer accidently looks at local variables when matching function signatures.

• Fixed one cause of loss of Blueprint subobjects when a Blueprint that is contained in another Blueprint is compiled.

• Fixed a crash in garbage collection due to mislinked SKEL_ classes, most frequently seen during long-running cook operations.

Blueprint Runtime

Bug Fix:

• Fixed a bug where arrays of structs with custom identical operators could fail to copy from Blueprint generated classes correctly.

• Fixed push-model blueprint array property not properly marked dirty if modified by different actor.

  • The root cause of the issue is due to incorrect function signatures on array function thunks. Several of them mark their input array as 'const', but clearly change the array.

  • When push-model support was added, this problem was discovered and worked around by adding MARK_PROPERTY_DIRTY calls directly in the thunks. The problem with this solution is that it doesn't work when we change an array on a different actor.

  • Additionally, the thunk doesn't have enough information to determine that easily.

  • The correct solution is to leverage the existing code in FKCHandler_CallFunction that has sufficient context to inject MarkPropertyDirtyNode accurately.

  • In order to get array functions working, we needed to fix their signatures to use UPARAM(ref) instead of 'const'. One issue with this fix is that there might be existing Blueprint code that incorrectly uses mutable array functions with read-only data.

  • For now, we'll support this, but with a warning to fix the code as it'll become an error in 5.9. Currently, this warning is disabled until we fix affected content.

• Fixed a memory leak when using containers with types that allocate memory by default.

Gameplay

New:

• Mover:

  • Added a method of canceling movement features by matching gameplay tags.

  • Added User-Defined Struct support for Mover data collections, so Blueprint-only users can include custom data without requiring native code.

  • Now supports spring-based walking mode work in networked play.

  • Reduced potential memory operations when adding to a data collection by preferring to copy onto an existing matching struct if possible.

  • Added options for supporting root motion for non-vertical moves, which makes possible combining them with gravity-based falling.

  • Added a double buffer for cached sync state to avoid issues with reading in data that may be freed/overwritten.

  • Added Mover-Mass translators along with a Mover Integrations plugin to house various integrations between Mover and other systems.

  • NavWalking mode now sets floor results in the Mover Blackboard when projecting to level geometry is enabled.

  • Added an auto-expire policy option for rollback blackboard entries.

  • Added support for blueprintable layered moves through a new system that splits up Layered Move Logic and Data.

    • This allows Layered Move Logic to be made natively and in Blueprints in an effort to expand blueprint support in Mover.

    • These new layered moves exist alongside the old ones at the moment with the intention of these new moves eventually replacing the old ones.

  • Added options for handling out-of-band movement changes, whether to warn about it and whether to accept it as the new starting sim state. Usage is primarily for non-networked play, where an external system is allowed to move the actor around, such as during cinematics or temporary physics simulation.

  • Converted absolute timesteps to double-precision.

  • Now supports avoiding state-copying operations when the simulation state doesn't change.

  • Added AdditiveVelocity MixMode support to MultiJump Layered Move.

  • Made small adjustments to the extended Mover pawn to make sure additive velocity is respected by turning off extra jump input from CharacterMoverComponent Jump.

  • Added option for flat-bottom floor checks.

  • Added consistent angular velocity when changing movement modes.

  • Adjusted mover API to use a FVector for angular velocity instead of a FRotator. This changes some public API related to Mover.

  • Removed the gravity orientation from angular velocity calculation.

  • Added simple montage replication support for the character-focused MoverComponent.

  • Added first version of rollback-aware blackboard.

  • Added experimental option to append inputs into sync state, for cases where you want to share inputs with sim proxies that are not simulated and may not have those inputs available.

  • Made MoveInput and MoveInputType BlueprintReadOnly, so setting this input is done through specific functions only. This means we can properly apply some precision to input to make sure all clients/server have same value after NetSerialization.

• Cameras:

  • Added Blueprint getter nodes for camera rig parameters.

  • Added evaluation context to transition conditions' API.

  • Now shows the name of the camera rig on the rig prefab node.

  • Added more debug information for blend stacks.

  • Added ResolveCameraRigProxy method to Blueprint camera director.

  • Moved lens calibration camera node to the CameraCalibrationCore plugin

  • Some changes to input slots:

    • Now runs input nodes in OnRun. OnUpdateParameters is only meant for pre-blending input parameters, not running actual logic, if only because it is run in isolation on just a few nodes that opt-in.

    • Moved the revert axis options onto the base input slot class.

    • Added a speed option on the input slot class. Pre-blend that instead of pre-blending the actual player input.

    • Moved the user-exposed option for accumulation onto the axis-binding specific node, in preparation of adding an actual accumulation node for more complex input chains.

    • Moved axis-binding code to a helper class in preparation of a "raw" input action node.

  • Added raw input action and accumulator node for complex input chains.

  • Added "driven control rotation" input node:

    • This input node makes possible using a "centralized" player input system which drives control rotation on the pawn, while still enabling cameras to have different orientations, such as when using target preservation with various lateral offsets (and therefore parallax requiring converging cameras with different orientations).

    • The active camera rig uses control rotation as-is, but any blending-out camera rigs use their last control rotation driven by the "delta" control rotation each frame.

    • This seems to be a good compromise between cameras limited by a single orientation and having player input managed by camera rigs individually.

  • Added the GetPlayerController method on the Blueprint camera node evaluator.

  • Added an option on camera components to set control rotation.

  • Added the ability for the Camera Debugger panel to bind to specific camera system instances (for instance, picking which Gameplay Camera actor to debug).

  • When drag-and-dropping a camera or camera rig asset onto a level or a sequence, create the corresponding actor.

  • Camera rig parameters now default to not pre-blended.

    • Defaulting to pre-blended benefited a few cases, but also caused visual bugs in a couple of other cases, so it's not worth turning it on by default.

  • Moved persistent rig activation functions onto the camera components and the camera manager.

    • These Blueprint functions were previously global, affecting whatever camera system host was currently considered "active".

    • This turns out to be unclear and prone to errors. Now the user activates persistent rigs exactly on whatever they intend to.

  • Now auto-create camera rigs and assets when nothing is specified on a Gameplay Camera component (but log a warning).

  • Made the orientation initialization service available to 3rd parties, and added an API for overriding the target or yaw/pitch to preserve.

  • Added a Blueprint utility function to access the evaluated camera's orientation.

    • Added Teardown API for node evaluators, added layer and active camera rig information.

    • Made node evaluator and evaluation service flags inclusive by default (i.e. opt-out).

    • Added a new "initialize with ideal framing" option on screen-space framing nodes.

  • Added a "family shortcut" bar to various camera asset editors for helping navigate between related assets.

  • Users can now set variables to be pre-blended.

  • Made QoL improvements to the Blueprint camera node.

  • Added bone/socket options to the attach to player pawn node.

  • Improved advanced camera shakes (add shake instance IDs and the ability to interrupt and stop a shake), improved the internal API for implementing shake nodes, and fixed a few bugs.

  • Implemented a more proper auto-build for camera assets for PIE.

• GAS:

  • Improved logging for missing attributes in FActiveGameplayEffectHandle when using GetGameplayEffectMagnitude.

  • Gameplay Tag display ends in an ellipsis when the display is cut off rather than overflowing.

  • Gameplay Tag and Tag Container meta data "DisplayShortTagNames" will now remove the Categories filter from the beginning of the Tag chip in the details panel.

  • Gameplay Effects stacking options now have better names and comments.

  • CooldownGameplayEffectClass validation: When a GameplayAbility is configured with a cooldown GE class, validation will check whether that GE applies any tags.

  • Updated the GameplayTagCountContainer to serialize tags itself and provide for fine control of what tags should replicate where via EGameplayTagReplicationState enum.

  • Exposing common GameplayEffectSpecHandle and ActiveGameplayEffectHandle queries to Blueprint. The following Blueprint callable functions have been added to AbilitySystemBlueprintLibrary to empower Blueprint programmers when making GameplayAbilities. Since some GameplayAbilityTask callbacks only provide a GE spec handle and/or active GE handle, now you can do more with those handles:

    • GetGrantedTags: Gets gameplay tags granted by a Gameplay Effect, from the effect's spec handle.

    • GetAssetTags: Gets gameplay tags describing the GameplayEffect, from the effect's spec handle.

    • GetGameplayEffectFromSpecHandleIsDurationGameplayEffectSpecHandle: Whether a GameplayEffect is instant or non-instant.

    • IsActiveGameplayEffectHandleValid: Whether a handle for an active GameplayEffect is a valid handle or not. Applied instant GEs don't result in an active handle.

    • IsActiveGameplayEffectHandleActive: Whether a handle for an active GameplayEffect is a valid handle and it's still applied.

    • GetAbilitySystemComponentFromActiveGameplayEffectHandle: Retrieving the AbilitySystemComponent from an active GE handle.

  • Renaming a gameplay tag in the Gameplay Tag Manager now automatically renames all sub tags.

  • Added predictive gameplay effect stacking and improved stack overflow handling.

• The data validation error for when there is a null input trigger on a key mapping now includes the name of the input action which it is mapped to.

• You can now call "SetShouldConsume" on any Enhanced Input bound action handles.

  • You can also define "ENHANCED_INPUT_ALLOW_LEGACY_BINDING" in your game's .build.cs file to enable legacy key bindings onto enhanced input components, making upgrading to enhanced input easier.

• Added GetActorFilter UPROPERTY meta support to object picker (mirroring GetAssetFilter).

• Added a virtual function to UBlueprint, ShouldAutomaticallyRegisterInputOnConstruction, which can be overridden in widget blueprints.

• Added a set of deprecated input action/axis names in the project settings.

• Added "Setter=SetShowMouseCursor" to APlayerController::bShowMouseCursor.

• Added ReleaseGameFeaturePlugins for multiple plugins at once. Unloading plugins batches GC and GameplayTags tree changes together which improves performance of unloading operation

• Added an editor preference for setting a "Simulated Device Mapping Policy".

  • This can be used in the editor to change how input devices get mapped to platform users, which can be useful for testing device connection sequences for your UI, log in flows, etc.

  • Added the current device mapping policy to the output of the "Input.LogAllConnectedDevices" command.

• Added helper functions to Ability system library: HasAnyAbilitiesWithCondition and HasAnyAbilitiesWithAssetTag

• Added QueueWorkFunction and SendQueuedWork to the TaskSyncManager which can be used to queue a batch of function pointers to execute as a simple tick task. This can be used with RegisterTickGroupWorkHandle to safely schedule batched gameplay thread work from any worker thread.

• Calling GetDeviceSpecificData now uses the given input device ID. If that is invalid, it uses the platform user's most recent device.

• Added LoadGameIfExistsAsync to SaveGameSystem which combines the exists and load checks into one async call to avoid an extra frame delay. Changed GameplayStatics to use this for async loads which fixes a warning when trying to load a nonexistent save game.

• Added ensure and comments to prevent creation of registered FTickableGameObjects on worker threads which is an unsafe race condition.

• Added an option to the FTickableGameObject constructor to enable creating with a disabled tick, which is safe on a worker thread.

• Added bindable "virtual" accept and back FKeys.

• Added a OnPostUserSettingsInitialized delegate to Enhanced Input, which will fire after the Enhanced Input User Settings have been initialized on the subsystem.

• Added more ways to detect a local player subsystem when using the node which does not have an explicit player controller target pin.

• Implemented SlideAlongNavMesh option for CMC NavWalking mode. This means pawns in NavWalking mode can move along a navmesh rather than just moving towards a projected point on the navmesh.

• CineCamera: Added an option to disable dynamic exposure.

  • Previously, turning off depth-of-field with FocusMethod would also turn off exposure simulation. This was fixed recently, but also meant that CineCameraComponent would now always simulate exposure, which isn't always desirable.

  • This change adds a new ExposureMethod setting to allow disabling exposure too.

• Made sure that the key mappings "supported key profile" tag is respected, and made the OnKeyProfileChanged delegate Blueprint assignable.

• Fixed a race condition crash on shutdown of the SteamController plugin.

• Added an "Input.LogAllConnectedDevices" command to dump all the currently connected input devices and some metadata about them to the logs.

• Reduced mouse input overhead on Windows by processing raw mouse moves on a separate FRunnable thread in the WindowsApplication..

• GameplayTags and GameplayTagContainers created in Blueprint give the user a way to edit the "Categories" metadata for tag filtering in the owning Blueprint.

• Fixed a crash where UPlayerInput::SmoothMouse would assert before it would attempt to divide by zero.

Bug Fix:

• Mover:

  • Fixed a bug in mover angular velocity clamping where the limit was not respected when rotating off axis

  • Added CommonLegacyMovementSettings shared settings in various movement modes to avoid a crash that could happen if they were the only mode added.

  • Fixed an issue where pawns wouldn't follow a navlink off the navmesh if bSlideAlongNavMeshEdge was true.

  • Nav walking modes now force a navmesh projection if something comes along and invalidates our last floor information, such as teleportation.

  • Now initialize the Mover mode state machine earlier so it can be used in backend initialization if desired

  • Fixed NaN issue in UMovementUtils::ComputeVelocity that could happen when MoveDirectionIntent was zeroed out.

  • Fixed issue where backends could leave stale non-persistent structs in sync state between frames.

  • Fixed several cases where strict equality checks on orientations could fail due to float point imprecision.

  • Fixed an issue where a specified InputProducer could fail to have ProduceInput called on it.

  • Fixed a Blueprint editor crash during validation if there's a shared settings object set to None.

  • Fixed issues with trying to maintain the small distance off of floors in falling/flying modes where a character could get pulled towards the floor.

  • Fixed improperly calculated angular velocity for mutli-axis rotation cases, and added utility function to compute it.

  • Fixed a bug in standalone mode where the time step was being rounded down to the nearest whole millisecond.

  • Fixed floating point precision error in mover's fixed delta time calculation.

  • Finding a movement modifier by handle and by type now searches through the queued modifiers on the Mover State Machine as well. Fixes an issue where modifiers weren't found immediately after queuing them.

  • Fixed local->world root motion conversions when non-yaw rotations are involved.

  • Fixed cases where some movement modes were not respecting the setting for remaining vertical.

  • Fixed bugs where an actor can violate the min/max distance it's supposed to float above walkable floors.

  • Made sure we use BaseVisualComponentTransform to update PrimaryVisualComponent transform in FinalizeFrame so changes to BaseVisualComponentTransform apply to the visual component regardless of whether we're smoothing state or not.

  • Now properly expose Movement Mode in-out references in GenerateMove and SimulationTick to Blueprint.

  • Searching modifiers by handle with an invalid handle will return nullptr rather than active modifiers with invalid handles that haven't been fixed up yet.

  • Now passing along starting velocity in Falling modes if we didn't use any time. This fixes some velocity cancellation that sometimes causes a stutter on landing.

• Cameras:

  • Fixed main camera assets not being usable as Blueprint variables.

  • Fixed crashes and bugs with rewind debugger integration.

  • Improve debug info display with extra data, more filtering options, and a few other things.

  • Fixed single-rig updates missing some of the steps the blend stack does.

  • Fixed static initialization problems that can lead to debug blocks not saving their fields in trace files.

  • No longer freezes camera rigs during stateless evaluations.

  • No longer warns about a camera asset not using any rigs if it's using proxies, and builds any rigs in the proxy table.

  • Fixed a crash when a camera's enter or exit transitions have empty pins.

  • Fixed an incorrect reset-to-default behavior on the camera parameter editor UI.

  • Now prevents infinite recursion when there's a cyclic reference of camera rigs.

  • Fixed gameplay tag transition condition; when a tag query is specified, it should fail if there is no previous/next camera rig.

  • Normalized yaw/pitch for spline orbit node

  • Can now run the target ray-cast node when there's no player controller.

  • Can now build and run camera rigs and shakes with no root node.

  • Now prevent rig prefab nodes referencing their own camera rig.

  • No longer throws asserts or error messages when we have a camera actor without an asset specified on it

  • Fixed activating persistent rigs during director initialization, and having these rigs receive custom parameter overrides.

  • Now validates that exposed camera rig parameters have the correct type for what they're connected to.

  • Fixed possible crash in GPC camera manager when the last evaluation context is removed from the stack.

  • No longer updates dampers and interpolators when the delta-time is zero.

  • Now properly freeze blends (possibly mid-blending) when freezing a camera rig in a blend stack.

  • Fixed simple fixed-time blends not saving/restoring their current time.

  • Fixed a crash when changing the type of a camera rig parameter.

  • No longer shows byte/int types for data parameters.

  • Now resolves camera rig name conflicts when building the property bag for a camera asset.

  • Fixed camera rig parameter nodes not being added to the list of graph objects.

  • Fixed assert when adding an enum data parameter to a camera rig.

  • Fixed broken "inline" evaluation of camera shake prefabs.

  • No longer pre-blends camera variable table entries that are not flagged for it.

  • Fixed the tick group for the camera components.

  • Fixed a crash when running editor builds without an editor.

  • Added missing initialization call for blend nodes in merged camera rigs.

  • The camera reference widget is now disabled if overridden with a rig parameter.

  • Fixed a crash when connecting a camera variable reference to a camera rig parameter.

  • Fixed an issue where rigs could keep running with old data after their asset was rebuilt.

  • Fixed "Home" button in camera rig editor.

  • Deleted references to camera variables when a variable collection is deleted.

  • Fixed a possible crash when running with unbuilt or outdated rigs.

  • Fixed Blueprint breakpoints not working on GET/SET parameter nodes.

  • Fixed shake prefab node not passing shake parameter values over to the visual layer in deferred mode.

  • Fixed SET parameters nodes not setting anything if the parameter wasn't already known in the variable/data tables.

  • Fixed error messages for unexpected situations lerping/overriding variable tables.

  • Fixed variable and context data tables sometimes returning uninitialized memory, and replace assert with one-time warning.

  • No longer uses manual focus distance on the output camera component if the focus distance isn't set.

  • Fixed pin types and colors for some data parameters.

  • Fixed incorrect parameter/pin types on the Blueprint camera node for object and class pointers.

  • Camera modifier rigs added from the player camera manager should now be aware of the player controller.

  • Added fixes for the player camera manager:

    • No longer double-updates Gameplay Camera actors

    • Now run the vanilla (Blueprint-based) camera modifiers ourselves after the camera system.

    • Now sets the transform of the camera manager itself to where the final viewpoint is.

• GAS:

  • Consolidated code that checks whether an AttributeSet's FProperty represents a gameplay attribute, and improved coverage and stability:

    • FGameplayAttribute details customization dropdown will only show attribute set properties that represent GameplayAttributes. Previously it showed all properties.

    • GameplayDebugger will now also display doubles. Doubles as FGameplayAttributes remain supported for legacy reasons.

    • Fixed GameplayDebugger crash when an UAttributeSet had any int32 UPROPERTY().UAttributeSet::InitFromMetaDataTable now only processes property types that can back gameplay attributes.

  • Fixed a crash when debugging gameplay effects with aggregate by source stacks.

  • Fixed an issue where SetTagMapCount didn't call OnTagUpdated like the other tag update functions. This will now be called when Gameplay Cue tags and Loose Tags are added and removed (No change for changing values that don't add or remove the tag).

  • Fixed target data recalculating source tags and attributes when applying Effect Spec.

  • GameInstance pointer for Async Actions is correctly reset after it is un-registered.

• Network Prediction: Changed static initialization of FNetworkPredictionModelDefRegistry's singleton to avoid issues with static initialization happening out of order causing registered Network Prediction model definitions to be skipped/removed. Also, made some minor adjustments to FNetworkPredictionModelDefRegistry::FinalizeTypes to avoid potential ODR issues.

• Fixed an error in ULocalPlayerSaveGame::IsSaveInProgress where it always returned true even if one was not in progress.

• Added an ensure to protect against missing player state crashes during seamless travel.

• Map placed actor Event Dispatcher duplicates:

  • A map placed Blueprint actor's bindings to another map placed actor's multicast delegates (including Event Dispatchers) are now cleaned up when the actor is destroyed and reinstanced.

  • This fixes a bug that bindings to other actors' multicast delegates accumulate when recompiling an actor blueprint. Previously this resulted in event nodes firing multiple times, increasingly when the Blueprint is recompiled.

• Now return the playercontroller if found from the owner.

• Network Prediction: fixed crash in smoothing service that could occur after adding more simulation objects during runtime

• Fixed replication issue canceling Gameplay Abilities when destroying the ASC from the server while abilities are active.

• Fixed Multiply (Compound) modifiers not calculating correctly with stacked GameplayEffects.

• Prevented a crash in APlayerCameraManager when the owning player controller has been GC'ed.

• Input triggers and modifiers will now properly respect the priority of an input mapping context. This fixes a bug where if you had the same input modifier class on an input mapping context of a different priority, it would always use the modifier values of the one which was pushed to the stack first.

• Fixed code that removes ?listen from client URLs to work correctly with # options as well.

• Ensured that the "SlateApp.GetModifierKeys" function will return the correct values when called on platforms using GameInput to process keyboards.

• Fixed OnBlendComplete not being broadcast in Standalone (non-networked) games.

• Find-in-Blueprints: When a BP member variable is a struct, its members' default values are now searched and returned as results. Map keys are not supported yet.

• Chaos Mover: Fixed floating point precision error in ChaosMoverStateMachines's fixed delta time calculation.

• No longer restarts a camera animation blend out when reaching the blend out time if we were already stopping.

• Fixed DefaultToInstanced subobjects breaking on blueprint duplication.

  • Fixed instanced subobjects, including DefaultToInstanced classes and UPROPERTY(Instanced), breaking when a blueprint class with instanced subobjects got duplicated.

  • This fixes the following editor actions which previously resulted in data loss:

    • Duplicating blueprints with user defined instanced subobjects.

    • Duplicating blueprints with GAS attribute set DefaultSubobjects.

• Player Input: Fixed a bug where if you had an input component whose outer was a subobject of the currently controlled pawn, the input component would be processed twice.

  • One example where this could be a common issue is within the "Modular Gameplay Framework". Users would add a UInputComponent to some UActorComponent, and then call "PushInputComponent" on the owning player controller. This would result in the UInputComponent being processed twice.

  • This would happen because in "APlayerController::BuildInputStack" it calls "GetComponents" on the controlled pawn, which would return the UInputComponent which had already been pushed to the controller's input stack, thus adding it twice to the stack for processing.

• Enhanced Input: Do not load platform-specific override data on post load of the platform settings. If you are referencing an object that is in a plugin, this will just fail anyway and does not improve any sort of loading behavior.

• Fixed an incorrect Deleter being used on FGameplayAbilityTargetData when calling FilterTargetData, and exposed FGameplayAbilityTargetDataDeleter for this purpose.

  • Use this deleter when creating an FGameplayAbilityTargetData using FMalloc, such as in UAbilitySystemBlueprintLibrary::FilterTargetData.

  • When creating TSharedPtr to FGameplayAbilityTargetData which was created with FMemory::Malloc, please use the FGameplayAbilityTargetDataDeleter

Deprecated:

• Deprecated the "Speech Mappings". These speech mappings were originally added to support Hololens, which is no longer a supported platform and can be removed.

• Removed the deprecated functions on the camera manager, GetCameraCachePOV and GetLastFrameCameraCachePOV.

• GAS: Deprecated StackType to make it private in the future, use new accessors instead.

Mass

New:

• Added time-slicing with FMassEntityQuery::FExecutionLimiter to limit execution to a set entity count.

• Added a Mass command for grouping entities.

• Mass Debugger:

  • Added "Open In Query Editor" button to all query displays in the debugger.

  • Added handle-based sorting of entities on the Entities tab.

  • Completely overhauled breakpoints with new types, filtering, hit counters, session to session persistence, copy-paste.

  • Added query editor UI with load/save and copy/paste support for authored queries.

  • Added Fragments view tab.

  • Added new "Selected Entity" breakpoint filter to break for whichever entity is selected in the gameplay debugger or debug UI.

• FMassFragmentRequirements and FMassEntityQuery are no longer UStructs, which they were never supposed to be.

• Added observers locking to commands flushing. This change results in batching observers calls, significantly reducing the number of individual observers executions (~20 times in CitySample).

• Added MassQueryExecutor to unify the functions of MassQuery and MassProcessor and create a foundation to remove dependency on UObjects for Mass processing in the future.

  • Simplified Mass data access with templated UE::Mass:FAccessors collection.

• Added a way to fetch base-typed fragment views from Execution context while providing the actual, specific class with a UScriptStruct pointer.

• CFragment concept now checks whether types are std::is_trivially_copyable and if not emits errors requiring users to manually mark fragment types that are not trivially copyable.

  • The goal is to educate fragment creators about good practices and point out fragments that might accidentally violate the requirement.

• Deprecated FMassBatchedCommand::Execute as a const function and introduced non-const replacement named `Run`.

  • Unfortunately a new name had to be introduced since the constness of the function is the only thing that's changing.

  • Added a temporary construct to MassCommandBuffer to statically detect commands that still implement the deprecated virtual Execute in an attempt to make it easier for people updating their code to notice the change.

  • The construct will check at compile time all the pushed commands of known types and statically assert if the command type still overrides the deprecated `Execute` function.

• Entity Builder API extension, supporting use of an arbitrary "element" type and having the builder figure out what kind of an element that is and store it appropriately. Additional changes:

  • Fixed FEntityBuilder::AddInternal implementation to not add duplicated instances of a given element type if one is already present.

  • Added creation context to the deferred path, to ensure the fragment values are already set when the observers kick in. This was already done in the synchronous path, so this change addresses the inconsistency

• Added a couple of functions to MassEntityManager, that deal with types passed in as UScriptStruct, and pass the argument to the appropriate function, based on the type (Tag or Fragment).

• Mass Command Buffer API extension:

  • PushUniqueCommand: the function lets callers add a hand-crafted command. Use it to push commands that you don't want to get merged with other commands of the same type.

  • AddTag and RemoveTag: added versions that take an array view of entity handles.

  • DestroyEntities: Added a version with rvalue ref parameter.

• Added FMassFragmentRequirements::AddElementRequirement that can be called at runtime with UScriptStruct.

  • It will add the provided type to Fragment or Tag bitsets, depending on the type represented.

• Added FMassRepresentationParameters::Identical to implement logically-correct FMassRepresentationParameters instances comparison. The operation by design ignores CachedDefaultRepresentationType and CachedRepresentationActorManagement.

• Added a way to ask a MassCommandBuffer about its host thread.

• UMassVisualizationTrait can now be configured to not check mesh descriptions for validity which can be used to procedurally populate trait instances.

Bug Fix:

• Fixed inconsistencies between single and multi-threaded deferred command flushing in FMassProcessingPhase::ExecuteTick.

• Modified the occasionally failing ensure condition in UInstancedActorsData::OnInstancedActorDestroyed and provided it with more comments and a message to emit.

• Properly handle shared fragment hash collisions.

• Mass puppet actors now get destroyed immediately when the puppet is destroyed.

• Fixed configuration issues of FMassProcessingContext created in UMassSpawnerSubsystem::DoSpawning for running initializer processors.

  • The original configuration was flushing commands if any have been issued, but did so in a way that forced flushing of all the system's commands accumulated up until that point. That resulted in different behavior in entity spawning depending on whether there were initializers for a given entity available or not.

  • The new configuration results in keeping the behavior consistent, regardless of initializers presence, which is to not flush commands and if any are issued they will be appended to the main buffer when FMassProcessingContext goes out of scope.

• MassGameplay:

  • Fixed a crash when a mass representation actor is destroyed while mass simulation is active.

  • Fixed a teardown crash in MassAgentComponent.

  • Fixed a situational crash in UMassRepresentationSubsystem on world teardown.

• MassAgentComponent changes to update EntityHandle-to-actor mapping in MassActorSubsystem when dealing with a player-owned component.

  • The change fixes an issue with GameplayDebugger's Mass category not being able to display info on the player-owned entity. A tiny change to the category removes the friction when doing that (no longer requiring the transform fragment to display data).

• Fixed an issue in FMassEntityQuery::ParallelForEachEntityChunk stemming from the code not taking into consideration that ParallelForEach's workers can be moved between threads.

  • If that happened and the query was run with `bAllowParallelCommands == true`, then the command buffer would complain about being used outside of the thread of its creation. The fix is updating the thread ID of the command buffer whenever it's picked up.

• Now sorting observer processors to utilize UMassProcessor.ExecutionPriority.

• Fixed FarmTest to not crash on PIE:

  • The existing implementation is crashing since the changes to processor initialization have not been applied there.

  • This issue is limited to the farm-test, due to the custom and legacy way of setting up and running processors.

• Fixed standalone-game IA uses by properly talking to ServerInstancedActorsSpawnerSubsystem, which fixes some IA representation issues.

  • Also, ServerInstancedActorsSpawnerSubsystem has been fixed to `FinishSpawning` actors only once their IAComponent has been configured.

• Marked UMassCapsuleTransformToMassTranslator as "game-thread only" to avoid data races when the observed component is modified in game thread as the data is being accessed by the processor.

Networking

New:

• Implemented RPC state stomp detection which can detect state buffer writes between quantization and serialization. The cvar to control this is net.Iris.RPC.ServerStompDetectionEnabled which is false by default.

• Support Iris when using NMT_JoinNoPawn and NMT_JoinNoPawnSplit.

• Adding an FSocket::ReleaseNativeSocket for use with native socket API's (e.g. asio). Using this new function inside the TraceAnalysis' FDirectSocketStream to support cases where we want multiple connections, not just a single connection (e.g. a multi-server capture).

• Iris

  • Implemented seamless travel support. If seamless travel support is not needed for a project the cvar net.Iris.AlwaysCreateLevelFilteringGroupsForPersistentLevels can be set to false to avoid unnecessary overhead of filtering objects in the persistent level.

  • Optimized polling to only poll objects/properties that are marked dirty.

  • Added some async loading failure debugging cvars:

    • net.Iris.AsyncLoading.FailPackageName Name: fails async loading all packages containing the package name.

    • net.Iris.AsyncLoading.FailNextLoad 1: fails the next async load regardless of the name and resets the cvar.

    • net.Iris.AsyncLoading.FailAllLoads 1: fails all loads until the cvar is set to 0.

  • Gracefully handle reaching the end of the bitstream even if it's unexpected. The behavior is controlled via cvar net.Iris.ReplicationReader.GracefullyHandleReachingEndOfBitstream.

  • Added better logging when handling end of bitstream issues. Reset the read journal when deserializing huge objects.

• Added a NetDriver command for printing out all of the actors registered for replication (generic replication system only).

• NetEmulation:

  • Added netEmulation setting to simulate buffer bloat on game traffic.

  • Set PktBufferBloatInMS for outgoing packets and PktIncomingBufferBloatInMS for incoming packets.

    • Ex: 'netEmulatation.PktBufferBloatInMS 1000' will apply 1sec of buffer bloat on outgoing traffic.

  • netEmulation.BufferBloatCooldownTimeInMS can also be used to set a cooldown period between each buffer bloat occurence.

    • Ex: 'netEmulation.BufferBloatCooldownTimeInMS 2000' means buffer bloat is not applied for 2secs after a buffer flush.

  • Added a "BufferBloat" emulation profile that enables buffer bloat of 400ms (in and out) over an 'average' emulation profile.

• Added metrics to measure the performance and behavior of the multiserver proxy.

• Multithreaded Iris Polling Step:

  • FObjectPoller can now kick off multiple FReplicationPollTasks, each of which processes a subset of the ObjectsConsideredForPolling array.

  • This is set to process cache line sized Chunks in an interleaved pattern so that each task gets a roughly balanced amount of work, and we avoid false sharing the same cache line.

  • Also supports the ForcePoll flow if PushModel is disabled.

  • Added NetBitArray ForAllSetBitsInRange function to facilitate iterating over different parts of the same Array inside each task.

  • FNetTypeStats now supports threaded access through the use of ChildNetStatsContexts that are used during parallel phases and then accumulated into the parent context at the end of a frame.

  • Configuration is done at the ReplicationSystem level so that we can enable it just for GameNetDriver on the Server.

  • We define a flag called bIsInParallelPhase which is true whilst the FReplicationPollTasks are running, and is used to protect against non-thread-safe access during this time.

  • Added capability for Networking Iris Polling phase to be run in parallel. This can be enabled by adding bAllowParallelTasks=true to the ReplicationSystemConfig

• MultiServer:

  • Refactored LaunchMultiServer script. Users can now derive from it to add their own features.

  • The -ProxyGameServers command-line argument can now accept a port range. This helps with launching multiple servers on a single host, so you can just use 127.0.0.1:9001-9025 for 25 servers.

• RemoteObjects: Now reschedules aborted ServerReplicateActor calls rather than retrying them.

• Fixed an issue where UActorChannel::ReplicateActor did not account written bits in one of the paths

• Renamed RepNotifies CSV stat to Generic_RepNotifies to better distinguish between Actor Channel based replication (generic) and Iris replication.

• Added support for closing child connections in the net driver and closing connections on the multiserver proxy.

• Added mutators to UNetworkMetricsDatabase functionality.

  • Mutators can be added to UNetworkMetricsBaseListener and get a chance to process input metrics every frame. They report an output metric to their owning listener on the listener's reporting interval.

  • Use mutators to aggregate metrics that are set more frequently than a listener's reporting interval. Basic mutators for min, max, and average are provided.

  • Added server-side network metrics for RawPing values across all client connections.

• Added support for actor replication relevancy when using the multiserver proxy.

• The multiserver proxy now shares a single NetGUID cache and objects are cached on the proxy when migrating between servers.

Bug Fix:

• Fixed a crash which could occur if an actor channel was removed during replay playback scrubbing.

• Iris:

  • Fixed bug with FastArraySerialzierFragment if using not replicating items.

  • Fixed bug where FGameplayAbilityTargetingLocationInfoNetSerializer would not properly call FreeDynamicState.

  • Fixed bug that could prevent a default subobject from receiving a large RPC.

  • Fix edge case with prioritization causing a crash.

  • Fixed issue where dirty status of new subobjects created from PreUpdate of objects was masked out.

  • Now resets NetBitStreamReader between batches to get correct read journal entries and clear overflow status.

  • ObjectProperty class type is now validated property when serializing object references.

  • Fixed a bug where initial state was not applied when beginplay() was dispatched for world from AGameStateBase::OnRep_ReplicatedHasBegunPlay.

  • Fixed a bug that allowed adding subobjects to torn off root objects.

  • FScriptInterfaceNetSerializer can now handle blueprint implemented interfaces.

  • The ObjectReplicationBridge's AddDependentObject method will now prevent circular dependencies.

  • Fixed bitstream corruption that could lead to disconnects.

• Can now pass zero size to FNetBitStreamWriter's InitBytes method.

• Network:

  • Added UE_FAST_ARRAY_COMPILE_LOG_LEVEL that enables a program to control the compile time verbosity of LogNetFastTArray logs.

  • Since this class is templated the logs in the functions are unique per implemented class so it can grow the amount of the log static strings if they are left compiled-in.

• Fixed issue with FObjectReplicator's CanSkipUpdate with net.PushModelSkipUndirtiedReplication enabled.

• Made a change in UNetDriver::IsLevelInitializedForActor to avoid iterating over net connections if the actor we are evaluating has the correct world, or if the actor it is not a player controller

• NetDriver:

  • Fixed ping updates discarding higher ping values when multiple Acks were received in one packet.

  • For example this caused ping values to stay low during BufferFloat occurrences.

  • Added RawPing metric that tracks the highest ping value received every frame.

  • RawPing will not change if no packets are received or the incoming packets contain no new Acks.

• When using Iris replication, objects that have a spatial filter set at runtime will now always use their correct location for filtering calculations.

• When using Iris replication, actors and subclasses without explicit FilterConfig overrides in ObjectReplicationBridgeConfig will now be filtered based on their relevancy flags like bAlwaysRelevant.

  • Previously these actors were treated as always relevant regardless of their bAlwaysRelevant flag.

Deprecated:

• Removed error prone SetConnectionFilter API from UReplicationSystem. Use exclusion groups instead.

• Deleted UNopNetObjectFilter. It's been superseded by UAlwaysRelevantNetObjectFilter which has identical functionality.

• Deprecated GetSubobjectsWithStableNamesForNetworking function

Level Design and Art Tools

Geometry Core

New:

• We now use the fast cluster simplifier for convex decomposition's pre-pass simplifier (since the main use case is to make the decomposition faster).

• Geometry Core: Added morph target attribute as a core dynamic mesh vertex attribute.

• Added path intersection & difference.

• Added a ReparameterizedCloserToWorldFrame to the GeometryCore TOrientedBox3 class.

• Added a CreatePerVertex method to dynamic mesh overlays, as a faster alternative to the CreateFromPredicate() method in the per-vertex case.

• Added a vertex -> single triangle method to dynamic mesh, as a faster/more-convenient path (vs e.g. using a vertex->triangles iterator to get a single element).

• FDynamicMesh3 queries now optionally take an inline-allocated array for local vertex-neighborhood mesh queries.

• Added optional scale factor to DynamicMeshUVEditor::ScaleUVAreaTo3DArea utility function.

• Added option for geometrycore's MeshBoolean to report the source mesh of each result triangle.

• Added option for the Mesh Boolean to take a custom 'inside mesh' function, per mesh.

• [GeometryCore] Delaunay 2D iterative update support.

• Added a version of Expand() to FAxisAlignedBox3 and FAxisAlignedBox2 that takes a vector.

• Segment Tree: - add option to build the tree with an array of segments - make use of the filter function that's passed in as an option.

Bug Fix:

• We now reset the UsedCount on a moved-from RefCountVector, so it is left in a valid state (and e.g. a mesh will not fail CheckValidity after being moved from).

• Made the implicit morphology generator not hit an ensure() when passed an empty mesh (and still return an empty result).

• Fixed the dynamic mesh color transfer method handling of non-compact meshes when biasing element positions, and simplified the lerp-toward-centroid logic used.

• Fixed static mesh's LOD -> dynamic mesh conversion handling of non-compact polygon group IDs

  • We need to compact these IDs so that they correspond to static mesh section indices, which all our tools and geometry script processing expect.

• Improved performance of MeshRegionGraph operations:

  • Region merging transfers known neighbor information, rather than recomputing it.

  • Less redundant validation on internal operations.

  • Less redundant array searching when building neighbors.

• Added api exports to the OBJMeshUtil methods so they can be called from other modules.

• Made MeshConvexHull's grid sampler exit when mesh bounds are empty, to avoid ensures on grid w/ zero cell size.

• Fixed dynamic mesh CompactInPlace creating a triple-sized TriangleEdges array + add coverage for this case in CheckValidity, and guard against this kind of error breaking AppendWithOffsets.

• We now do not leave unused vertices in the cluster simplifier mesh result mesh.

• Fixed incorrect transforms on GeometryCollectionToDynamicMesh converter, and added more comments to document the expected coordinate spaces for these meshes.

• Fixed crash in implicit morphology offset operation due to offset grid dimensions overflowing int32.

• Fixed a possible crash in algorithms that use the sparse solver wrapper, by properly handling failed factorizations.

Geometry Script

New:

• Added various oriented box functions to geometry script, to create and query / test intersections and convert to meshes.

• Added an OBB containment function to geometry script (matching what simple collision fitting does, but exposing the found oriented box directly).

• Improved geometry script's CopyCollisionMeshesFromObject support for complex collision.

  • It now supports any type that implements the IInterface_CollisionDataProvider interface, and specifically should now work better with Skeletal Mesh Components and Spline Mesh Components.

• Added a 'select occluded from outside view' jacketing method to geometry script, to have more controllable occlusion operations (e.g. from specific directions, for specific material IDs/parts of mesh, w/ transparent tris).

  • Also, cleaned up the detect exterior visibility function logic to support the new options and be a bit faster / more robust.

• Added target edge length QEM and cluster-based simplification methods in geometry script.

• We now more consistently use the term "Connected Islands" instead of "Components" when referring to connected pieces of a mesh in Geometry Script nodes.

• Filled out geometry script list conversion extract/set methods for the various list types: Scalar, UV, Vector and Color.

• FOrientedBox is now exposed to Blueprint.

• The 'debug' pins in geometry script are now hidden in the Blueprint graph

• Geometry script now supports standard MikkT tangents in the Compute Tangents node, on platforms where the MikkT library has been compiled (i.e., win/mac/linux).

Bug Fix:

• Added Vertex and Triangle ID validation to geometry script Mesh Query methods so users do not crash on querying an invalid element ID.

• Made dynamic mesh pools safer to use from a non-game thread.

• Fixed the output param display name for GetMaxMaterialID.

• In geometry script asset creation methods, we now test that the paths for new assets are valid before attempting to use them.

• Fixed a bug with "AppendXWithSimpleCollision" geometry script methods where repeated calls of a script could accumulate extra copies of the collision shape, because blueprint re-uses output reference objects across script invocations.

• Removed requirement that patch unwrap mesh be non-compact.

• Fixed issue where Geometry Script would maximally simplify a mesh if "Simplify to Tolerance" was run with a tolerance of 0.

• Deprecated incorrect geometry script perlin noise node, and added a corrected v2.

Landscape

New:

• No longer visualizes disabled landscape patches.

• Now sorts landscapes alphabetically when multiple landscape actors are editable in landscape mode.

• Changed the landscape Collapse Layer tool to use selective render weightmaps code instead of intermediate render code.

  • Added weightmap support for edit layer selective renders.

• Added a GrassMap RenderEveryFrame command, to debug grass map runtime generation.

• Changed landscape tools with the "Combined Layers Operation" feature to use new selective layer render code.

  • Stops using old "intermediate render" code and avoids polluting the persistent texture data with intermediate results. The new version is faster and safer.

• Moved the Landscape feature level warning (for shader modes < SM5) from a blocking notification to a simple console log.

• Landscape optimization for the editor:

  • No longer inspects materials for finding mobile layer names when generating mobile weightmap allocations while there's no weightmap allocations in a given landscape component in the first place.

• Performance optimization when undoing landscape edits.

• Added a transient landscape property to track the last selected edit layer index. Edit layer selection state is persistent when toggling between editor modes.

• Removed the ability to place Landscape Blueprint brushes from the Place Actors panel.

• Added all landscape brushes from the Landscape Manage - Blueprint Brush tool.

• Enabled dynamic Landscape Spline control point billboard size and offset in editor.

  • To change the offset and size, configure Spline Icon World ZOffset and Spline Icon Scale under the Landscape Project settings.

  • To maintain legacy spline behavior, set CVarLandscapeSplineEnableFixedSpriteIcons=True.

• Removed the Landscape Spline Deform to Landscape buttons used to update spline data for non-edit layer landscapes. With edit layer landscapes, Landscape splines automatically affect the data when a Spline Edit Layer is added.

• Added API exposure for all public BlueprintCallable Landscape Patch functions.

• Exposed landscape component's GetGrassTypes to Blueprint.

• Added generic World Partition Landscape Builder Commandlet. Builds all landscape grass maps, physical materials, and nanite components.

• Improved landscape.DumpLODs command:

  • Now it only displays the landscape LOD information by default and -detailed needs to be used to get the verbose mip-to-mip delta information.

• Added an option to align landscape grass instances with the precise triangle normal when using jittered grid mode.

  • Also fixed an issue with the triangle normal calculation.

• Added API exposure to virtual functions on landscape patch plugin UCLASSes so that they can be inherited from in other modules.

• Remove redundant and unsafe non-blocking landscape nanite build from PreSave. No longer builds Nanite at all on auto-saves.

• Added an option to Add Unassigned Blueprint Brushes in the Landscape Edit layer context menu. If a Blueprint brush does not have an assigned edit layer, the right-click context menu will include an option for re-assignment

• Added a DeleteActors helper in order to let the editor's delete actors dialog run when possible but also to let actors be safely deleted without using the UI in other cases.

• Added Landscape Edit Layer Context Menu customization system.

  • Added the ability to easily extend right-click context menu actions for custom edit layer classes.

• Moved LandscapePatch plugin out of Experimental.

• UX improvements:

  • Updated icons to landscape target layers display order methods.

  • Added sort type (ascending/descending) for this.

  • The sort/filter options have moved next to filter box within the Layers property (since they affect only the layers that are visible, these buttons should not be present when the property is collapsed).

  • Added a number of target layers in the Layers property header, in order to be similar to standard arrays and also the edit layers property above.

• Added Collapse All Edit Layers action to the Edit Layer context menu.

  • Removes all edit layers and flattens the current data into the default edit layer.

• Updated default spline edit layer selection behavior:

  • Selecting the Splines Edit Layer no longer auto-activates the Splines tool.

  • Double-Click on the Splines layer, or use the right-click context menu option, to toggle between the Splines Tool and last active tool.

Bug Fix:

• Fixed mobile landscape weightmaps not being taken into account by streaming.

• Fixed a crash when auto-filling target layers from material.

• Fixed height/weight alpha precision loss when merging landscape.

• Fixed grid-alignment warnings when creating a landscape with more than one region worth of components.

• Added refined Water Body underwater detection to avoid applying post-processing when the camera is underneath or outside the bounds of the collision volume

• No longer calls UpdateResource when changing texture LOD settings for render targets. This fixes the water brush breaking landscape after switching between desktop mobile preview mode and desktop renderer.

• Fixed landscape legacy weight blending potentially leaving ghost weightmaps on large landscapes.

• Turned assert about landscape physical material tasks failing to complete on save into an error, since that is something that can happen if the material fails to compile.

• Fixed a crash that happened when trying to clear a Landscape Paint Target Layer that was already empty.

• Fixed a crash when a Landscape Blueprint brush was deleted and then restored via Undo.

• Removed spurious assert when the landscape material references a texture named "Heightmap" (implicit name for heightmaps in landscape).

• Fixed determinism issue when updating landscapes with conflicts on the border of landscape components that would lead to landscape proxies getting dirty in an inconsistent way.

• Fixed an issue with World-Partition Landscape Proxy Nanite Materials not updating after using Undo/Redo with the Landscape Paint Tool.

• Fixed invalidations of landscape physical material during painting.

  • The last few frames of a paint stroke could be lost because the invalidations were ignored while a physical material task was still pending.

• Fixed several issues with ReinitializeHeight/Weights in landscape patches.

• Fixed crash with multiple patches. The render command recorder was not stopped at the right moment: both Render and Blend operations must respect the render mode (Immediate or Recorded), which could be broken in case the renderer was grouped with another one earlier.

• Fixed landscape that was not updated after having reinitialization had been executed.

• Fixed a crash when the same patch is rendered in several batches. The boolean bReinitializeHeightOnNextRender does not support this and that supposes that during reinitialization, the patch is rendered in a single batch. The fix artificially increases the batch size to the entire landscape, which is wasteful, but the best we can do until the reinitialization is replaced by a proper landscape edit layer partial merge.

• Fixed landscape batched merge not handling multiple weight patches (i.e. multiple target layers) being rendered on the same patch component (the render targets would cycle in between each, leading to invalid blending).

• Fixed landscape patches' input area (which was the size of the patch), that would lead to needlessly large batches.

• Fixed potential determinism issue with landscape patches that could theoretically render before their referenced textures are fully streamed in.

• Handle null landscape patch weight entries in the couple of places where it was not.

• Fixed invalid checks in landscape batched merge.

• Stop over-invalidating on empty landscape components. Change to invalidating only components that added or removed weightmap allocations.

• Fixed PCG refresh on undo/redo landscape painting.

• Moved creation of landscape nanite's UStaticMesh out to the game thread to remove danger of threading issues.

• Fixed improper blend of landscape edit layers with custom height/weight flags.

• Avoided a crash if saving when FLandscapeTextureStreamingManager is not available.

• Fixed a bad ensure condition when trying to cache data from an empty area in the landscape smooth/flatten/erosion tools.

• Fixed a crash with the Landscape Copy Tool when attempting to copy data from an invalid or deleted landscape.

• Fix deleted landscape spline points/segments coming back after duplicating the spline.

• Fixed a crash occurring when saving level instances that include World-Partition Landscapes.

• Fixed ctrl+alt+right click drag increasing/decreasing the landscape brush continuously even when the mouse was still.

• Fixed mobile landscape data hash being zeroed when entering PIE. That was leading to all landscape mobile data being rebuilt when entering PIE while in mobile preview mode.

• Fixed a landscape flatten tool conflict with undo.

• Fixed landscape flatten tool behavior at the edges of geometry.

• Fixed landscape painting errors when toggling "invert" during a brush stroke.

• Fixed an issue with the Landscape Resize tool clearing all heightmap/weightmap data for edit-layer based landscapes.

• Fixed an issue with Water Bodies automatically generating invalid collision boxes in the Blueprint editor when changing the Wave Source property.

• Prevented a crash when redoing an undo of a Water Zone actor deletion.

• Fixed an issue with the Landscape Resize tool using the wrong Y position offset while expanding the landscape.

• Fixed the handling of changing transforms when building landscape groups.

• Fixed additive blend mode for landscape texture patches.

• Fixed various landscape+water new cases where it was assumed that GetWorld() returns a valid world while it's not the case when a world is deleted from the content browser.

• Improved the Landscape Import/Export Exposed user experience by exposing the Landscape Gizmo location property to the Landscape details panel.

• Fixed a crash updating landscape edge snapshots when heightmaps are not readable.

• Fix landscape edit layers merge on Vulkan SM6.

• Fixed a crash when renaming a Landscape Paint Target Layer to an invalid name. Target Layer names must be unique non-empty names.

• Keep landscape patches in sync with their host landscape by upgrading them from the soft-dirty package list to regular dirty status when the landscape makes that same change.

• Enabled landscape grass culling when running MRQ.

  • Previously we would pass an array of no camera to RegenerateGrass, which prevents all landscape grass from being distance-culled.

  • Instead, we now pass nothing, which leads landscape to use the streaming manager to get the current "views", one of which is the captured camera (the other, the editor).

  • This is better handled in the new movie render graph but at least this solves a performance issue in grass-heavy scenes. The user can now override the grass cull distance (as well as grass density) via Game Overrides settings.

  • Default = override + cull distance multiplier of 50, to have (mostly) backwards compatibility with the previous MRQ captures (which prevented all grass culling) The default for grass density override is false, though, also for backwards compatibility reasons.

  • Note that the new movie render graph doesn't have these settings since it doesn't have them for ViewDistanceScale, ShadowDistanceScale, etc. so we figured it didn't need those grass settings either.

  • Also added a CVar (grass.VisualLog.ShowCameraLocation) to show the camera locations used by landscape grass in the visual logger.

• Now displays an error message instead of crashing when failing to import an image file to a landscape layer.

• Avoided a crash on opening a scene containing the legacy LandscapePatchManager when the scene was already at the max number of edit layers. Ignore the soft limit when creating the new dedicated patch layer.

• Fixed OOBB->AABB computation in landscape batched merge, which was leading to bad blend groups for landscape patches.

• Fixed an issue with landscape brushes that would sometimes modify height/weight data on the border with unloaded tiles.

• Avoided a crash when opening a map with a disconnected landscape patch manager, when the editor isn't ready to provide the current selection set.

• Fix for Nanite landscape possibly generating invalid Nanite mesh streaming data on cook.

• Added an option for landscape Blueprint brushes to tell if they require power-of-2 render targets to operate. For backwards compatibility reasons, it's set to true by default, although it's not the best option. This ensures that the water brush behaves precisely how it used to before UE 5.6

• Fixed the water brush on Vulkan SM5.

• Fixed an issue where Landscapes only generate Nanite for the first 64 components of any given landscape proxy.

• Fix missing landscape spline meshes after undo of merger of two splines.

• Now hides the landscape selector when the New tool in the Manage panel is active.

• Fixed a rare crash in the landscape texture streaming manager when landscape textures are GCed while the landscape is still active.

• Fixed missing updates to landscape physical material when using a material instance.

• Fixed a crash using Undo operation with a Landscape Patch and Patch Edit Layer.

• Landscape add component tool fixes:

  • Now properly generates extrapolated height data on each persistent edit layer, so that there's continuity on the corners on each of them.

  • No longer generates collisions on component creation because at this point, the height data is set to all zeroes (i.e. the minimum height, not the median, default height value) and doesn't correspond to what comes out of the the subsequent edit layers merge, whose readback would generate an identical heightmap hash, and would therefore not re-generate collisions. Delaying collision generation until the merge fixes this, since that's the first time the collision values would be valid anyway.

  • Now prevents existing neighboring components from being dirtied when adding a new component (previously they would get dirty by the simple act of caching/interpolating their height data).

  • Automatically apply splines after component creation, so that new components are immediately affected by the splines that overlap with them.

  • Improved visualizer for the component about to be added.

• Prevent landscape edge fixup from running on world composition maps, where heightmap sharing is still possible.

• Fixed all logs involving landscape LandcapeGroupKey and LODGroupKey.

• Fixed ensure loading old landscape data with landscape.StripLayerMipsOnLoad = false.

• Fixed a crash occurring after exiting a level instance with the Landscape Editor - Landscape Copy tool active.

Deprecated:

• Deprecated legacy non-edit layer landscapes:

  • Removed all editor tooling related to non-edit layer landscapes (e.g. Landscape Retopologize Tool/XY Offset data).

  • Disabled the creation of non-edit layer landscapes and the ability to toggle between edit layers and non-edit layer landscapes.

  • When non-edit layer landscapes are loaded, an automatic conversion to an edit layer based landscape occurs. During this process, all proxies copy the existing non-edit layer data to a new default edit layer. Any existing Retopologize data is removed and the proxy is flagged as "soft dirty" with an editor viewport warning.

• Removed global and local merge code and deprecated anything that was only available for this.

  • Since the console variable "landscape.EditLayersLocalMerge.Enable" is deprecated now, a new console command was added, to trigger a landscape layer full update (landscape.ForceLayersFullUpdate) :

    • With no argument: Updates all landscapes.

    • With arguments: Updates all landscapes whose display name (partially) matches the argument (e.g. with 3 landscapes named Landscape_0 Landscape_1 and Landscape_2, "landscape.ForceLayersFullUpdate _0 _1" will trigger an update on the first 2 only)

• Changed landscape edit layers merge API from experimental to official.

• Removed landscape's "intermediate render" code path.

Modeling Tools

New:

• Added support for the tangents tool to choose the reference UV layer to use when computing tangents.

• Added BrushValue property to the AttributePaintTool to allow users to specify the target value that is painted down rather than always accumulating to 1.0f.

• Added symmetry support to the Paint Vertex tool.

• The target requirements for the Inspect tool have been relaxed to support DynamicMeshProviders rather than MeshDescriptionProviders.

• Modify UBoundarySelectionMechanic to be able to operate on either closed loops (current behavior) or open spans (new optional behavior).

• Lattice Deformer Tool:

  • Modified the FFDLattice to optionally accept an oriented bounding box rather than computing one from the input mesh. This means the lattice can operate on just a portion of the mesh. Lattice computations are now all done in local space.

  • Added an ILatticeStateStorage interface, which enables the interactive LatticeDeformerTool to store its state in when the tool ends.

• Added support for a HitBackfaces option to the MeshAttributePaintTool.

• The attribute paint tool now has the option to use a more-shaded material.

• Added an option to the Mirror tool to averaging normals along the weld.

Bug Fix:

• Fixed a crash on attempting to split meshes w/ invalid material IDs.

• Fixed an issue where the AttributePaintTool's stamps would be skewed for meshes with non-uniform scale.

• Fixed where modeling tools could incorrectly change material ID assignments due to the static mesh tool target 'IMeshDescriptionCommitter' interface not finding the right material ID mapping method.

  • The same function is also on the Provider, so needed to be pulled to the top level for both interfaces to find the method.

• Made vertex sculpt tool skip render decomp step if the sculpt mesh has no triangles (fixing ensure when tool is run on an empty mesh).

• Fixed a crash in the subdivide tool. We were passing in the wrong vertex count to OpenSubdiv.

• Fixed a potential crash when enabling UVLayoutPreview.

• Fixed a warning about realtime mode erroneously appearing in modeling and scriptable tools modes when the editor doesn't have focus.

• Fixed a potential crash in DisplaceMeshTool for meshes with invalid topology.

• Fixed a GC crash with mesh element selection's usage of PreviewGeometry.

• Fixed support of the 'join method' for closed curves in the Mesh Splines tool (previously always used 'square' joins).

• Fixed a crash on starting modeling mode w/ an actor selected that has null components attached.

• Fixed a crash when swapping from Modeling Mode to Animation Mode with Motion Trails active.

• Fixed a potential crash in the ISM Editor tool.

• Fixed a potential nullptr dereference crash in OnActiveViewportChanged for StylusHandling.

• Fixed the OutputType properties' display name and tooltip to SourceType in the BakeVertex tool to better reflect the function of those properties.

• Fixed an issue where tools in Modeling Mode and Scriptable Tools Mode would not tick if the viewport did not receive focus yet during the editor session.

• Fix for crash in Extrude Path tool when creating a totally straight polyline.

• Fixed a rare crash when hovering over Mesh Element Selection before viewport is focused.

• Fixed Mesh Splines tool handling of duplicate start/end points generated on looping splines, which could previously cause incorrect triangulations.

• Lattice Deformer Op: Fixed a check that fires when operating on non-compact meshes.

• Fixed an issue where the Union tool only transferred UV Channel 0 in the result mesh.

• Fixed a potential crash in TDynamicVector::TruncateBlocks for an empty vector.

• Added a workaround to prevent a crash in UVAtlas.

• Normal seams on dynamic meshes are now automatically hard edges when converted to mesh description, which can better preserve sharp features when the dynamic mesh is used for editing a static mesh or skeletal mesh asset.

• Reduced confusion during displace tool computations by adding a slight delay to the appearance of the 'in progress' material.

• Addressed a bug which displayed random gizmo orientation in local space in the PolyEdit tool.

• Fixed an error in AddSingleClickBehavior and AddDoubleClickBehavior function tooltip.

• Fixed the StaticMeshSelector only working on exactly StaticMeshComponents.

Procedural

New:

• Added "SetWorldObject" on the PCG Data Exporter for Blueprints.

  • Objects can't be cast to World in Blueprints, and when doing an utility widget, Get Selected Assets returns an array of objects.

  • Does the cast internally, returns false if the cast fails.

• Added support for skeletal meshes in BoundsFromMesh and PointFromMesh.

  • Deprecate StaticMesh property to Mesh property in PointFromMesh, with override alias

• Added a new "Extract Attribute" node to extract any attribute from any data and domain.

  • Factorized code for Get Attribute From Point Index.

  • Get Attribute From Point Index now works with data domains too.

• Added the Polygon2D data type, that represents a 2d polygon (e.g. on a plane), with an additional transform. Has some polygon specific metadata properties on both the data domain and the vertex domains.

• Added Python Interop Plugin and Execute Python Script Node.

• Stand up the Break Debugger debug feature for GPU nodes, and make the breakpoint conditional on inspection so that it is usable in partitioned/higen use cases.

• Fixed multiple performance bugs where GPU-resident data is unnecessarily read back when passing through Change Grid Size nodes.

• Added toggle to GPU nodes to trigger render captures for debugging (editor only).

• Added GPU processor node for Attribute Sets.

• Fixed runtime generation bug where changing Partition Grid Size setting on PCGWorldActor resulted in generated actors being leaked into the level.

• Added re-nameable categories for organization in Graph Parameters + Includes Drag and Drop.

• Improved priority calculation in distance and direction runtime generation policy to behave more uniformly across grid sizes and to be easier to tweak.

  • Note: May require re-tweaking if non-default weights were in use.

• Added Generate Landscape Textures node that can generate a height map as well as grass maps from the landscape. This path does not rely on virtual textures, and is significantly more efficient than the CPU path.

• Added LLM tags for tracking memory allocations.

• Added a get segment node that allows the user to retrieve a segment from a polygon 2d, spline or point data, in the form of two points or a spline containing a single segment. Support negative indices (-1 being the last segment) in all cases and hole support for polygons.

• Added 'Clip Paths' node to cut paths (points or splines) with clipping polygons. Supports either difference or intersection.

• Add new property for data that supports elements: @Data.$NumElements.

  • Useful to combine with Filter Data by Attribute.

  • Added the concept of read-only for properties in the Selector menu to not show for output.

  • Applied this concept to Polygon2D properties.

• Added support for property remap when converting back and forth between Attribute Set and Points

  • Saves adding "Copy Attribute" nodes to do the conversions.

• Added option to disable default input creation for top-level graphs. Will become default eventually.

• Improvements on Boolean and Bitwise op.

  • Boolean op now supports arithmetic types as input, still produces a bool as output.

  • Added operators NAND, NOR, XNOR, IMPLY, NIMPLY.

  • Added ShiftLeft/Right for Bitwise.

• Added "AddModulo" operation in maths node.

  • Do operation (A + B) % C .

  • Useful to get the ($Index + 1) % NumPoints.

• Added comma-separated tag list (override) to create target actor node.

• Added polygon offset functionality (offset positive or negative, open and close holes).

• Added polygon operations (intersection, difference, union, inner intersection, exclusive or, cut polygon with paths).

• Added GPU implementation of Transform Points.

• Added change detection to runtime generation state to throttle scans over grid cells, saving per-frame Game Thread cost.

• Added 'Split Spline' node to split splines based on a few criteria (key, distance, alpha) or on a predicate on control points.

• Add `IsBuilder` to Get Execution Context node.

  • Needed to know which component the builder was scheduling.

  • Added that information to the PCG Editor Module, which can be queried through IPCGEditorModule.

  • Add helper function to get the result from the IPCGEditorModule.

• Added support for attribute curve remap.

  • Added a new mode in the existing attribute remap node.

  • Added an alias for curve remap.

  • Also exposed ExternalCurve for the spline sampler (with the new PCG_OverridableChildProperties).

• Added a 'Spline Intersection' node that computes intersections between splines (in 3d).

• Added a debug feature that repeatedly dispatches the compute graph to enable profiling, compiled out by default (PCG_GPU_KERNEL_PROFILING).

• Added String Contains and Matches nodes and .Length extractor + Extractor:

  • .Length - Length of the string

  • Contains - Whether string A contains substring B

  • Matches - Whether string A matches string B exactly

• Added Cvar pcg.GPU.FuzzMemory which initializes GPU buffers to random values during execution to help catch uninitialized data bugs and other undefined or unreliable behaviour.

• Added the ability to retrieve the ray hit material with GetMaterialFromCollisionFaceIndex, instead of needing to specify a material index.

• StructUtils: Added new features to the Property Bag Details View Child Row Widget:

  • Customizable via the EPropertyBagChildRowFeatures enum (set via metadata specifier).

  • New STypeSelector widget (wrapper around SPinTypeSelector) for type selection.

  • New Access Specifier button.

  • New drop down menu.

• Added 'Get Asset List' node to get assets from a folder or from a collection. Can extract asset classes and generated classes when these are blueprints too.

• Anim - SkinnedMesh: Exposed SkinnedAsset and TransformProvider on FSoftSkinnedMeshComponentDescriptor.

  • To have parity with the non-soft version.

  • To be used for the Instanced Skinned Mesh Spawner in PCG.

• Nanite Assemblies: Initial prototype of Nanite Assemblies builder to support creating Static Meshes.

  • Interop plugin, as this is still very experimental.

• Added specific graph cache enabled and budget CVars for editor worlds vs game worlds.

• Can now override nested properties in the Static/Skinned Mesh Spawner.

Bug Fix:

• Fixed multiple cook warnings arising from GPU node kernels.

• Fixed bugs with CreateGrid2D and CreateGrid3D Custom HLSL helper functions where the NumRows/NumCols arguments were not used correctly.

• Fixed Filter Elements by Index node's indexing issue.

• Now supports Attribute Rename for Selectors and Data domain.

• Improvements to Spline Mesh spawning.

  • Component class is now respected when spawning the spline mesh.

  • Added override on the component itself, if users have special fields they want to fill.

• Fixed an outstanding issue in package build where the Switch and MultiSelect nodes can fail if the DisplayName is different from the real name for an EnumValue.

  • GetDisplayName won't return the display name in package build but the real name.

  • Since we use the Display name for naming the pins, we need to keep a mapping.

• Fixed Create Points Sphere crash from divide-by-zero when graph params are used to set degrees to 0.

• Fix bool attribute in Write to Niagara Data Channel.

  • Writing bool values was crashing.

• Fixed bug causing Inline Constant not to respect required pin.

• Fixed Per data CRC caching issue when there are N:N mappings, which was the case in some configurations of the Match & Set node and the Distance node.

• Added support to call Pre/PostEditChange on objects on ApplyOnObjects.

  • When overriding objects with ApplyOnObject node, we call Pre/Post Edit change to have any pre/post processing to do after a change.

• Fixed an outstanding bug in match and set attributes for attribute sets in keep unmatched mode.

  • SetAttributes metadata entry keys arguments were in the wrong order.

• Can now drag and drop in the graph any asset that is a subclass to UPCGBlueprintElement.

• Fixed the RemapMaterial not working if the target dynamic mesh didn't have any material.

  • This was breaking appending a mesh with materials to an empty dynamic mesh, for example.

• Fixed erroneous readbacks and re-uploads of arrays of GPU data items that are not placed first in the compute graph's input data collection.

Texturing Tools

New:

• Improvements to UCurveLinearColorAtlas.

  • A bug was fixed which caused nearly black negative values to become white.

  • TextureHeight of Atlas is now automatically set to the number of curves.

  • The default width of new atlases is now 64 instead of 256.

  • Interactive updates are now much faster.

  • The UV scale for sampling atlases is now fixed so that the U range of [0,1] goes from the first to last pixel center. Old atlases will automatically be updated for these changes.

• Added Virtual Texture feedback and warmup support to TextureGraph material rendering nodes.

  • Virtual texture samples will now stream to the correct mip level before the final render.

  • Added a new console variable to control the warmup length: "TG.VirtualTexture.WarmupFrames".

UV Editor

Bug Fix:

• Fixed localization issue for the "Advanced Transform" category label.

• Fixed UVEditor launch conditions to support BP actors with mesh components.Fixed an issue where the RMB context menu would not display the UV Editor option for actors with any invalid components.

World Building

New:

• Added a Save Texture to Asset node (editor only).

• Added a world partition function to insert a new runtime cell transformer.

• HLOD:

  • Support Spline Mesh Components in Approximate Mesh HLOD.

  • Added world partition validation to detect actors having a HLOD Layer which doesn't support that actor class. Rules can be specified using a config file and violations trigger a warning.

• Standalone HLOD: Added AWorldPartitionHLODOnlyLevelInstance Actor to allow users to place Standalone HLODs in the world without having to add actual Level Instance to the world

  • After adding the actor to the world users can select the level for which Standalone HLODs should be loaded.

  • The actual level is neither loaded nor cooked. It's only used by the Standalone HLOD Subsystem to pull in the corresponding Standalone HLOD levels.

• Add overridable attribute support to CustomHLSL node

• Custom HLOD support:

  • Added WorldPartitionCustomHLODActor, an actor you can place in the world to provide a custom HLOD representation (using static mesh component).

  • Added a new HLOD Layer type: "Custom HLOD Actor".

  • Custom HLOD actors assigned to "Custom HLOD Actor" layer are injected as-is into the HLOD runtime partition.

  • The "Custom HLOD Actor" layer can specify a parent layer. In that case custom HLOD actors are also used to generate parent layer's HLOD representation.

  • Custom HLOD actors can also be assigned to other (non-Custom) HLOD Layers. In that case they are used only during HLOD generation and are not pulled into the HLOD partition themselves.

  • Adds a new LinkedLayer property to UHLODLayer, visible only when LayerType is set to Custom HLOD Actor

  • LinkedLayer is used to control the visibility of Custom HLOD Actors. They become visible when actors from the LinkedLayer are unloaded.

  • If LinkedLayer is not specified, Main Partition is used to control the visibility.

• Added a SceneCapture node.

• Added GPU implementation for CullPointsOutsideActorBounds.

• Now supports overridable attributes on GPU nodes.

• Added a world partition function to check if runtime cell transformers are installed.

• Cell Transformer: Improved handling of components that can be ignored.

• FastGeo: Moved FastGeoContainer PSO Precaching from PostLoad (GameThread) to be asynchronous.

• Added grid streaming dependency mode to scheduling policy

• Move PCG GPU from Experimental to Beta.

Bug Fix:

• Standalone HLOD:

  • Fixed a crash when adding a standalone LI with standalone HLOD to a non-WP world.

  • Made sure that Standalone HLOD Actors are injected into appropriate containers during streaming generation.

• Fixed attached spatially loaded actors not being GCed when AttachParent exists.

• EDL: Fixed handling of EDL injection of client-only cells in cases when it happens after BeginPlay Removes irrelevant cells from cells lists during the injection.

• Foliage Editor Subsystem: OnActorMoved optimization to avoid expensive TActorIterator operations when no work is done inside the TActorIterator loop.

• HLOD: Fixed distributed HLOD builds running on non-WP worlds not doing any work.

• WPBuilderCommandlet: Fixed logging when processing additional maps.

• Standalone HLOD: Fixed logic that generates the list of Standalone HLOD levels returned by ShouldProcessAdditionalWorlds, to correctly handle cases where the number of HLOD Setups differs from the maximum HLOD hierarchy depth.

• FastGeo: Fixed a crash on mac caused by TArray relocation of FFastGeoPrimitiveComponent which contains a FRWLock.

• [Cell Transformer] Replaced references to objects that could be recreated during RerunConstructionScripts triggered from ApplyRuntimeCellsTransformerStack in Standalone Editor.

• Fixed a crash while level editing. Deleting an actor inside a level instance then pressing save in the bottom of the level viewport would crash in some situations.

Media

Media Viewer (Beta)

New:

• Extra keybinds for videos:

  • Fixed spam of updates when offset / scale was not changing.

  • Exposed delegates to the public API so it can be used in the image viewer overlay.

• Transform lock now also duplicates media playback controls between players.

• New dragging options:

  • Revamped dragging system a little to support more zoom types.

  • Added alt+rmb to zoom (in addition to scroll wheel).

  • Added alt+mmb for panning (in addition to left click).

• Improved level editor viewport robustness:

  • Made sure all settings have default values.

  • Moved level viewport render to end of RT thread event.

  • Added cross-thread robustness to the pixel color system.

• Media track section:

  • Added a media track section that lists tracks in sequencer that have a media texture.

  • Added the refresh dynamic group button.

• Images now support yaw rotation.

• Added a clear history button.

• Added Snapshot category.

Bug Fix:

• Fixed controls to properly display when playing in reverse.

  • Also added keybind info to tooltip buttons.

• Media Viewer / Media Player Editor:

  • Added scrub event to IMediaPlayerSlider.

  • Integrated scrub event to allow dual scrubbing.

  • Fixed bug in file drag/drop for media viewer not allowing comparisons to current image.

• Media Stream: Fixed for packaged games.

• Fixed crash relating to viewport.

• Added texture size constraints to render calls.

• Fixed struct initial values.

• Fixed a crash with invalid library thumbnail.

• Fixed changing splitter location in single image mode.

• Media Stream:

  • Corrected the "Add Track" button for Media Sources.

    • Will now always display the button, but disable it, rather than hide it, when it is not available.

    • Added tooltip to the button explaining what it does and when it is usable.

    • It is now disabled if the Media Stream's world is not the level level sequence's world.

  • Fixed relevancy issue for Sequencer.

  • Fixed Sequencer binding issues.

• When locked scrubbing, the videos not being directly scrubbed is paused.

• Invalid assets are removed from history when the tab is opened.

• When in dual view and without an A image, the slider position now works correctly.

• Fixed pixel sampling for compressed images - All pixel samples now work via a render target.

• Fixed an issue with A-image not being displayed behind B-image when the slider was set to 0%.

• Right click asset fix: There's now a maximum parent check for material instances

• Fixed crash when 2 viewport tabs are open.

• Added cross-thread hardening for pixel sampling.

• Added more texture encoding types to the no-read-with-rhi list.

• You now must supply a unique name when saving snapshots.

• Toggling the overlay while in comparison mode no longer blocks the custom image ui (i.e. video control overlay).

Mobile Rendering

Mobile Lighting

New:

• Translucent objects now receive CSM shadow when surface lighting.

Mobile Postprocessing

New:

• Added EUpscaleMethod::Area and swapped in for PrimaryUpscale using the mobile renderer to reduce blurriness at low screen percentages.

Online

Crash Reporter

New:

• Apple:

  • Unified crash dump format on iOS & Mac to crashlog

  • Added commandline/ini override to enable crash dump on iOS.

• Upgrade PLCrashReporter to 1.12.0 and apply our existing modifications by diffing 1.8.1 vanilla & our modified 1.8.1

HTTP

New:

• Added an option to enable different http versions per IHttpRequest via SetOption(HttpRequestOptions::HttpVersion).

• Limit the number of concurrent HTTP requests by default. This helps avoid connection timeouts when queuing up very large numbers of HTTP requests.

Bug Fix:

• Fixed Blueprint compilation crash due to mismatching pin names.

• Fixed a low rate crash in HTTP requests.

Online Subsystem

New:

• OSS for GDK: Propagate the checkout failure error codes from GDK APIs into PurchaseFailure and PurchaseFailureStart errors.

• OnlineServicesCommon: Added TOnlineAsyncOp::GetWrappedHandle to transform the result of an operation to simplify cases where one operation is implemented in terms of another.

• Added OSSv2 PSN Connectivity interface.

Bug Fix:

• Fixed OnlineServicesNull handling FPartialUpdatePresenceFix FPartialUpdatePresence not merging RichPresenceString.

• "ENABLE_PGO_PROFILE 1" Shipping configuration can now disable online subsystems from the commandline.

• Fixed Push Event related issues

  • Fixed FNpPushEventWrapper::Initialize not correctly handling callbacks disposing.

  • Fixed OSSv1/2 FNpPushEventPushContextWrapper not handling TOptional value safely

• Fixed crash in FUserManagerEOS::ReadFriendsList callback when user failed to authorize.

• OnlineSubsystemIOS: Fixed a race condition that caused a purchase to fail when purchasing an offer immediately after finalizing a successful purchase of the same offer.

Deprecated:

• Removed deprecated GoogleSignIn support from OSSGoogle for Android.

Platform

Linux

New:

• Upgraded toolchain to LLVM 20.1.8

• Added preliminary support for BuildCMakeLib from Linux.

• Add -NoStripSymbols to UBT to support build systems where stripping needs to happen later in the process.

Bug Fix:

• Re-enabled PreLoadScreens.

• Now skips chmod +x dotnet if file is already executable. This addresses permission errors if UE is run on a read-only file system on Linux.

• Fixed an issue where BuildCMakeLib can produce .so files that depend on system shared libraries.

• Fixed loss of precision when FLinearColor is requested in VulkanDynamicRHI::RHIReadSurfaceData.

• Updated FLinuxPlatformProcess::BaseDir to support -basedir=.

Mac

New:

• Inline Ray Tracing is now available for Mac platforms running with the SM6 renderer.

• Parallel translation of encoders is now enabled by default on Mac (and can be used on iOS). This gives a significant reduction in overall RHI thread time.

• Compute shaders are now executed with concurrent dispatch on iOS and Mac platforms. This provides a significant performance boost when using Nanite.

• Adding Metal-strip to lib processing to reduce metallib sizes (around 10% reduction).

• Delete iAD framework (deprecated) from Core.Build.cs.

• Mac: Included Mac MainThread in CrashContext.runtime-xml for CrashReporter.

• Added support for Aliased formats to be explicitly declared enabling optimisation on Metal platforms.

Bug Fix:

• Fixed tweakobjectptr debug on Mac OS.

• Fixed process reaping to be non-blocking and not leaking.

• Fixed an issue where on Mac/iOS SM5 uniform buffers were bound to indices that were unnecessarily high, which caused validation errors in the RHI.

• Stopped the submission thread getting stuck when encountering a NotPermitted GPU error.

• Fixed bug where Metal runs out of counter sample buffers.

  • Metal now longer breaks encoders by default when profiling, this can still be enabled with GMetalSampleComputeEncoderTimings and GMetalSampleBlitEncoderTimings.

• Mac:

  • Fixed Cursor offset from visual because of an outdated ScreensArray when processing OnWindowDidMove, resulting from a DPI change.

  • Fixed MainThreadChecker issue in FMacApplication::OnWindowDidMove. Move bDisplayReconfiguring from FCocoaWindow to FMacApplication since it's not dependent on FCocoaWindow

• HairStrands: Disable HairStrands rendering on Mac SM5.

• ApplePlatformFile: Refactored to use the common implementation FFileHandleRegistry to support more than the limit of read-only opened files.

• Changed Fatal log to a Warning when posix_spawn fails in CreateProcInternal, for consistency with Windows, and to prevent unnecessary crashing.

• Fixed DPI scaling bug which could cause Mac's to render at 2x res when using PIE.

• Fixed performance issue on editor start up with mdfind taking multiple minutes due to matching incorrect types.

• Fixed potential bug where bindless handle could be null when retrieving viewport texture.

Online

New:

• Updated GooglePlay Billing library to 7.1.1 in OSSGooglePlay

Bug Fix:

• Pixel Streaming:

  • Fixed a crash when streaming with Pixel Streaming and a user attempts to enter text through the stream text modal on a multiline text element.

  • Fixed a crash in the editor when setting the streamID on the command line and streaming with Pixel Streaming.

• AVCodecs: Encoding frames with VP9 can now have odd pixel width or height.

Windows

New:

• Moved Win32 calls for mouse cursors off of the game thread and onto the task graph to reduce stalls on the game thread from internal lock contention that occasionally occurs.

• Moved processing of mouse inputs to a dedicated thread to reduce overhead on the game thread for Windows. This is useful for mice with high polling rates, e.g. 8000 Hz.

• Made Clang 20 the preferred version of Clang on Windows.

• Changed thread priorities for Game, Render, and RHI threads from Normal to AboveNormal on Windows.

• Increased MinimumWindowsX64TargetVersion from 0x601 (Windows 7) to 0xA00 (Windows 10) to make more functionality available directly from Windows headers.

Bug Fix:

• Ensured that shared resources are created as committed resources for improved compatibility.

• Changed our heap VA computation for transient resource allocations on Windows to fix D3D12 call failures on some GPUs.

• Fixed FWindowsPlatformMisc::SetEnvironmentVar to unset the variable if it is null or "", just like on Mac and Linux, and .NET 8.

XR

New:

• Added native support for the OpenXR XR_EXT_frame_synthesis extension, including Application SpaceWarp (AppSW) on Meta Quest:

  • To enable, set:

    • r.Velocity.DirectlyRenderOpenXRMotionVectors=1 (read-only)

    • xr.OpenXRFrameSynthesis=1 (toggleable at runtime).

  • Currently only supported on the Vulkan mobile forward renderer, and cannot be used alongside features which require standard velocity rendering (such as TAA/TSR).

• Added Android Runtime category tag for immersive mode selection.

  • See https://registry.khronos.org/OpenXR/specs/1.1/html/xrspec.html#appendix-android-runtime-category

• AddedIOpenXRExtensionPlugin hook OnCreateHandTracker().

• OpenXR XR_EXT_user_presence is now supported:

  • Added support for the user presence extension, which tells us whether the hmd is being worn if the platform supplies that information.

  • Removed the previous implementation which attempted to drive the worn state from other openxr state transitions. This had inconsistent and sometimes broken behavior across platforms.

• Replace xr.MobileLDRDynamicResolution with a new CVar, xr.MobilePrimaryScalingMode, which controls whether primary scaling is redirected to the HMD runtime (which will always use spatial scaling) when it would otherwise be unsupported.

  • Options are:

    • 0: Never

    • 1: DynRes Only (default)

    • 2: Always.

• Updated device profiles for standalone XR devices. They no longer inherit from each other in sequence, and the new Android_OpenXR device profile matches the Quest 3 profile which has had its shadow quality increased for dynamic shadows to draw by default in Mobile Preview and on Device. Consider lowering this value if dynamic shadows are not required.

• Improved expose passthrough support via the editor:

  • Added a new UENUM for environment blend modes, EOpenXREnvironmentBlendModeUpdate SetEnvironmentBlendMode() node to accept EOpenXREnvironmentBlendMode.

  • Added a new GetEnvironmentBlendMode() node.

  • Added a new GetSupportedEnvironmentBlendModes() node, which returns supported blend modes in an array in order of runtime preference (highest to lowest).

  • Added a new IsCompositionLayerInvertedAlphaEnabled() node.

  • Added an xr.OpenXRInvertAlpha checkbox to the OpenXR plugin settings.

  • Added an r.Mobile.PropagateAlpha checkbox to the Engine->Rendering->Mobile settings

  • Renamed OpenXRHMDSettings to OpenXR Settings, since it controls settings for the entire module.

• OpenXR is now building for all platforms:

  • The platform specificity of the openxr plugins and modules was problematic because content derived from these would not load on non-xr platforms for projects that are meant to be cross platform.

  • OpenXR is not actually platform dependent. It can be implemented on any platform. If it is present as a fully independent openxr runtime a small amount of platform specific code is needed to implement an openxr loader.

  • It is also possible to create an unreal plugin which either acts as an openxr runtime or is able to find an openxr runtime.

  • The plugins are still disabled by default.

Bug Fix:

• Removed permissions not allowed by Quest App Store.

• Fixed various debug draw elements failing to render when using Instanced Stereo or Mobile Multi-View:

  • r.VisualizeOccludedPrimitives

  • ShowFlag.Bones

  • DrawDebugBox and other similar calls, excluding DrawDebugString.

• Fix a bug where late update camera movements were not accounted for when calculating scene visibility, causing smearing, latency, or other artifacts when some rendering features were used.

• Fixed GetHMDData TrackingStatus field:

  • It was only checking if the hmd device tracking handle was valid, needs to check if the hmd is actually tracked.

  • It was also attempting to use the camera position rather than the hmd tracking position.

  • Removed GetMotionControllerData and FXRMotionControllerData which were deprecated in 5.5.

• Added handtracking permissions for Quest.

• Fixed OpenXR AddProfile for input always being given true rather than the passed in bHasHaptics parameter.

• Fixed a crash when using the SteamVR runtime with Vulkan.

• Fixed MetalViewport SubmitImmersive: [IOGPUMetalCommandBuffer setProtectionOptions:]:585: failed assertion `setProtectionOptions: with uncommitted encoder'

• Fixed Visionos cp_frame_query_drawable null handling:

  • We abandon the frame if the drawable is null, this indicates that the app is either being paused or exited.

  • Essentially we just continue the frame but don't call the cp_ functions.

  • At the beginning of the next frame we handle the state change.

Deprecated:

• Deleted the formerly deprecated functions from 5.3 to remove references to the UPlayerMappableInputConfig type.

Platform Mobile

Android

New:

• Added -FastIterate flag to Visual Studio/Rider/Quick Launch, to have libUnreal.so outside the APK, and made build iteration faster in general.

• Added -AndroidStudio flag to GenerateProjectFiles that generates a Gradle project that wraps around the original Gradle project that is suitable for use in Android Studio.

• The Android Vulkan detection logic now uses the same VkApplicationInfo parameters (e.g. App name, Engine version) as used by the VulkanRHI initialization, so graphics drivers that need to opt out of Vulkan for Unreal Engine apps can do so consistently.

• Implemented support for factoring screen rounded edges in computing the safe zone. The implementation means users can align the safe zone horizontally or vertically to the rounded edge excluded areas or to an average of both.

  • Additionally, cleaned up current safe zone implementation to determine size relative to the main view instead of the display as the system may reduce the main view to exclude cutout areas.

• Constrained kotlin stdlib dependencies to >= 1.8.0 to fix building issues.

• Recompiled libopenxr_loader with 16kb page support based on NDK 27.2.

• Removed need for security token for debuggable applications when using AndroidFileServer with UnrealAndroidFileTool.

• Added warning if a library on Android is not 16kb page size compatible.

• Removed bashrc/bash_profile related code, instead using zshrc for Mac as primary source of environment variables.

• Report resident size of "libUnreal.so+base.apk+[anon:.bss]+[anon:linker_alloc]" as ProgramSize on Android.

• Report resident size of all memory mapped files as MMIO on Android.

• Tag all virtual memory with "UE" VMA tag on Android.

• Added the vkquality 1.2.2 library which can be used as another data point as to whether to select Vulkan or OpenGL ES.

  • The result of the vkquality check is returned in the SRC_VKQuality that can be queried by the Android device profile selector rules.

• Updated AutoSDK "MinVersion" to NDK r27c.

• Improved AndroidFileServer (AFS) file transfer - retries and resumes for file push to device.

• Resolves potential sync issue that leaves the EditBox non responsive to text input and the keyboard in a state where it doesn't get dismissed its the 'Done' button.

  • Additionally, replaced setVisibility with add/remove View to work around an Android level spam issue when keyboard is repeatedly dismissed/invoked.

• Improved Android Camera Player with the Android Camera2 APIs and support for Vulkan frame data processing.

• Default NDK is updated to r27c, buildtools to 35.0.1, bundletool to 1.18.1.

• Recompiled libopenxr_loader with 16kb page support based on NDK 27.2.

• Replaced libhwcpipe with C wrapped .so to avoid C++ STL ABI conflicts on Android.

• Now starts loading libUnreal dependencies early for faster startup time

• Created Android-arm64/x64 configs in Visual Studio.

• Made Quick Launch now build an x86_64 binary when launching on x86_64 devices, such as the emulator.

• Lowered Android SDK "MaxVersion" to NDK r28c, due to NDK r29 compiler bug.

• Update GooglePAD to 1.15.4 / 2.3.0.

• Added engine device profiles for Mali-G1-Ultra and similar devices.

• We now detect devices using the ANGLE OpenGL ES driver and use the Vulkan deviceName string for SRC_GPUFamily. This means the device profile Vulkan selection can continue to match the same string as used when the device is in native OpenGL ES mode.

Bug Fix:

• Enabled desugar for older Android support.

• Filtered out AFSProject task if running it from Gradle (prevent second run).

• Ensured java sources are wiped when FirebaseEnabled is toggled off. Otherwise, source files are left behind that don't compile as the Java dependencies don't get populated by the plugin when FirebaseEnabled = false.

  • Additionally, registerBuildSettiings for the Firebase settings referenced from the plugin's UPL.

• Fixed the timing of firing the MediaOpened event in Android Camera Player.

• Fixed the issue that the Console Command input is disabled when "Show Launch Image" is off in Project Settings.

• Ensured keyboard OnTextCommitted messages are dispatched when using Android improved virtual keyboard.

• Ensured nativeKeyboardInputResult is invoked when keyboard is dismissed and keeps the reference to VirtualKeyboardWidget valid until the result is handled.

• Corrected issue with file locking in UnrealAndroidFileTool for writes.

• Fixed black screen when playing start movies.

• Added a watch for deletion complete before database close in Fetch2 (part of background downloading).

• Moved early load sync point to prevent possible crash due to an ordering issue.

• Made NDK toolchains detection for manual SDK installs more robust.

• Made JAVA_HOME environment setting for manual SDK installs more robust.

• Added missing setting of ndkPath to Gradle property value

• Fixed generated install scripts with overflow OBBs that are broken on non-Windows

• Updated Breakpad dump_syms with version supporting compressed symbols.

• Added catching of UnsatisfiedLinkError in GameApplication.LoadLibraries, in case some other ClassLoader has already loaded them

• Fixed the WebView freeze when switching the game to the background while loading a URL.

• Fixed VersionScriptFile not being created robustly, sometimes causing build failures.

• Worked around a Gradle bug whereby when only assets change, it attempts to patch the existing APK from previous packaging by adding asset deltas resulting in growth of the final APK payload. Workaround is detection of changes to assets and wiping the existing APK to force Gradle to repackage it correctly.

• Fixed a Java exception when closing the Camera Device during initialization.

• Fixed the "Play On Open" feature for the Android Camera Player.

• Fixed the keyboard EditBox layout on devices with cutout when the cutout area isn't used.

  • getWindowVisibleDisplayFrame returns a rectable in screen space, however, the edit box coordinates need to be provided in the main decor view's space.

  • As such, translate the results of getWindowVisibleDisplayFrame to the decor view's space by translating these by the decor view's screen position.

• libGPUCounters: Android early crash fix libGPUCounters is built with statically linked libc++, exposing a bunch of std symbols, which override those in libUnreal.so.

  • For example, it overrides std::to_string leading to an early crash:

    • Other plugin calls to_string (uses libGPUCounter implementation and its operator new & memory alloc).

    • That string is later destructed, using engine's operator delete.

    • Our allocator fatals on unrecognized pointer.

  • The fix is to add a linker version script to the libGPUCounters build and only expose C API related symbols as global.

• Updated Android TargetSDK Fix templates with AFS configuration.

• Updated Fetch2 3.3.0 with new version of androidx.room 2.7.1 (used for background downloading).

• Added detection of SQL lock error on enqueue (can happen after deleteAll in Fetch2 background downloading).

• Added new dump_syms_comp.exe supporting compressed Symbols for Android use.

• Fixed an issue with assets with starting offset other than 0.

• Made MakeApk do a clean during packaging if EnableBundle is flipped between builds.

• Fixed crash from pending JNI exception in non-Shipping builds, when skipping over checks.

• Now round rather than truncate Android getRefreshRate when converting to integer.

• Fixed the freeze of Android Media Player playback on Xiaomi 13T or devices with a similar chipset.

• Fixed TargetSDK 35 compatibility issues with background downloading.

• No longer requests WRITE_EXTERNAL_STORAGE permission if TargetSDK doesn't support non-scoped storage.

• Ensured that keyboard dismissed isn't called when the text input is accepted by the Virtual Keyboard's done key or a physical keyboard's enter key.

  • Additionally, ensured that on dismissal of the virtual keyboard, text entry type is Canceled so that text committal only triggers if the widget is configured with behaviour 'Text commit on Dismiss'.

iOS, tvOS, and iPadOS

New:

• IOS: Notification about network path characteristic FIOSPlatformMisc::OnNetworkConnectionCharacteristicsChanged can be used to know about network characteristic changes, e.g. knowing if a new connection is constrained or expensive.

• Re-enabled SetBytes and SetBufferOffset on iOS and enable on tvOS.

• Added support for Xcode26.

• The IOS rotation code now defers applying a new rotation until after we have rendered a new frame in the new orientation, for both auto-rotation and programmatic orientation selection.

  • This fixes the issue with a squashed aspect ratio when the user rotates the app at a time we cannot immediately render a new frame, such as during loading.

• Now ask for background time on iOS until all delegates called from applicationWillEnterBackground are invoked.

• Disallowed resolve of R32F MSAA targets as this format isn't MSAA resolvable in Metal.

  • Additionally, make the texture memoryless as we'll never be resolving to it.

• Exposed network changed delegate for iOS.

• Implemented functionality for -MetalPSOCache=use.

Bug Fix:

• Deferred handling of notifications if the engine isn't ready to receive.

• Occlusion Query Helpers now correct the number of frames for Metal mobile platforms.

• Ensured valid URL for pipeline cache save location.

  • The current invalid URL generated was invalid as it was constructing a file URL using the absolute string of another URL as a path parameter to the constructor, causing MTLBinaryArchive->serializeToURL to crash when used.

• Now store webauth credentials in iOS keychain using a key that does not change after uninstalls.

• Fixed some memory leaks in the iOS web browser.

Rendering

Architecture

New:

• Virtual Texture:

  • Renamed "r.VT.Support16BitPageTable" to "r.VT.PageTableMode".

    • The setting can now be modified live at run time instead of being read only.

    • Also removed "r.VT.SplitPhysicalPoolSize" which now corresponds to setting "r.VT.PageTableMode=2".

  • Unified mip color debug display for Virtual Textures.

    • "r.VT.RVT.MipColors" is deprecated and Runtime Virtual Textures now respect "R.VT.Borders" which other Virtual Textures already use.

    • "r.VT.Borders" is no longer on/off. The value now sets the debug border texel width.

    • Also added "r.VT.Borders.Mip" which isolates the mode to a single mip level.

  • Release/Recycle Virtual Texture spaces after they are unused for some time.

    • We don't release immediately to avoid cases during loading where this might trigger unnecessary Recreate/Resize work.

    • The old behavior was to never Release/Recycle unless we ran out of space slots.

    • Added "r.VT.SpaceReleaseFrames" to control this. The default is to release after 150 frames. Setting to -1 will return to the old behavior.

  • Changed draw behavior for selected meshes which only write to Runtime Virtual Texture.

    • Previously we would fully show those meshes on selection (they are hidden in the main pass otherwise).

    • Now we only show the selection outline.

• Runtime Virtual Texture:

  • The display name of the "Virtual Texture Builder" (also sometimes previously known as "SVT") asset is now "Streaming Runtime Virtual Texture" (i.e. SRVT). This avoids confusion with Sparse Volume Texture (SVT).

  • It can now be created from the content browser.

  • Now prevent StreamingTexture from being carried over when duplicating a RVT component (Save As, copy/paste...).  This avoids the common mistake of using another map's SRVT after a Save As.

• Added optional Z-increment parameter to FPixelShaderUtils::AddRasterizeToRectsPass, in order to control the Z of the quads (Z = quad index, i.e. instance id * ZIncrement). Combined with depth test enabled, this enables making the rasterization deterministic in case of overlapping quads.

Bug Fix:

• Runtime Virtual Texture preload requests now work for the adaptive page table case.

• Fixed programmatic RenderDoc captures randomly crashing.

• Fixed non DBuffer mesh decals not obeying the mesh component "Receive Decals" setting.

Lighting

New:

• Enabled VSM receiver masks for directional lights by default.

  • ~10MB memory overhead (depending on settings/scalability).

  • Often fairly significant performance improvements in uncached cases with lots of dynamic geometry.

• Disabled the selection of Virtual Textures on Rect Light components. These have never been supported in a cooked build, but were still shown in the Editor.

• Exposed Max Draw Distance and Max Distance Fade Range to Blueprint.

• Now store and propagate "cleared" flags to avoid reclearing pages we never wrote into; particularly relevant for receiver mask where we treat all dynamic pages as uncached but often don't write into them all.

• No longer allocate unnecessary receiver mask space if local light receiver masks are disabled.

• Refactored VSM ID allocation so that we can control the order more consistently. The immediate goal is to guarantee that directional lights get allocated first so that we can easily allocate receiver masks just for directional lights without the memory overhead of doing it for all local lights as well

• Added TexCreate_3DTiling flag to volume textures in TranslucentLighting to reduce memory and boost performance on some platforms.

• Marked r.UseClusteredDeferredShading and r.Mobile.UseClusteredDeferredShading as deprecated and added notification about future removal. Clustered deferred shading will be removed in a future release due to lack of utility to reduce maintenance burden.

Bug Fix:

• Fixed incorrectly reported one pass projection overflow with megalights active. Only run VSM coarse page marking once when there are multiple views as it is view-independent.

• Scale the light fade range by `GLightMaxDrawDistanceScale` to avoid lights becoming too dim at lower scales.

Lumen

New:

• Enabled half res integration on High scalability (r.Lumen.ScreenProbeGather.StochasticInterpolation 2).

  • This can soften normals in indirect lighting, and make GI a bit more noisy.

  • On the other hand it saves ~0.5ms on console at 1080p, which feels like a right tradeoff for High scalability intended for 60hz on console.

• Lumen Screen Probe Gather: Bent Normal Integration improvements (r.Lumen.ScreenProbeGather.ShortRangeAO.ApplyDuringIntegration 1)

  • Implemented r.Lumen.ScreenProbeGather.ShortRangeAO.ScreenSpace.FoliageOcclusionStrength.

  • Fixed EvaluateSHIrradiance which was causing brightening in corners.

  • Removed double AO apply during bent normal integration. Now instead of applying AO for the second time we apply only the GI approximation using AOMultiBounce, as DistantIlluminationRescale was too strong.

  • Clamp decoded AO as it could be larger than 1 causing too strong indirect specular occlusion.

  • Now support ShouldApplyDuringIntegration when Screen Probe Gather Integration and Short Range AO downsample factors match.

  • Fixed artifacts when ShortRangeAO is disabled, but ShouldApplyDuringIntegration is enabled.

• Lumen HWRT path now supports split screen.

• R.LumenScene.DumpStats 3 will now dump primitive culling information. This is useful, as it merges instances into a single entry making it easier to read the log.

• Moved GBuffer tile classification out into a single pass, which is also storing opaque history for the next frame. This pass is reused across Lumen and MegaLights for better performance.

• Screen tile marking optimizations, which speed up reflections, GI, and water reflections.

• Tweaked default settings:

  • r.Lumen.TraceMeshSDFs 0 - SWRT detail traces (mesh SDF tracing) is now a deprecated path, which won't be worked on much. For scaling quality beyond SWRT global traces it is recommended to use HWRT path instead.

  • r.Lumen.ScreenProbeGather.MaxRayIntensity 10 - firefly filtering is now more aggressive by default. This removes some interesting GI features, but also reduces noise, especially from things like small bright emissives

Bug Fix:

• Fixed missing subsurface energy by removing extra divide by PI. Now an emissive card matches a rect light reference of the same irradiance. This bug was only affecting Epic scalability (r.Lumen.ScreenProbeGather.IrradianceFormat 0 path).

• Fixed a bug on Mac platforms when running on SM5 using R11G11B10 for Typed UAV's causing rendering corruption.

• Fix visual artifacts and out of memory reads/writes when using non power of 2 Tracing Octahedron Resolution. Now Tracing Octahedron Resolution is always clamped to valid input values.

• Nanite Skeletal Mesh now supports bHasRayTracingRepresentation, so that those primitives can be skipped from Lumen under certain conditions.

• Fixed landscape culling stealing the r.Lumen.DiffuseIndirect.Allow's on changed callback. This is not needed anymore since this CVar's callback already invalidates all components, including landscape ones.

• Fixed tile artifacts on indirect specular on cloth pixels in the same tiles as hair pixels

• Don't reset temporal history on SceneTexturesExtent change. Sometimes SceneTexturesExtent can change due to inline view rendering (like water) which causes full history reset and results in visible noise on screen until things converge again.

• Skip creating RGS when Lumen is disabled from the PPV volume.

Materials and Shaders

New:

• Added an asset registry tag to find material instances causing shader permutations.

• Enabled Virtual Texture sampling on Volume material domains.

• Changed the interpretation of the PreSkinned Local Bounds material node when used on Instanced Static Mesh. Previously it was the bounds for the entire component. Now it is the bounds for the mesh instance.

• Added platform cached ini value to determine whether to compile 128 bit base pass pixel shader variations on platforms which require them. These are infrequently needed and turning them off can save 50k shaders / 15 MiB at runtime r.128BitBPPSCompilation.Allow (default is true, for backwards compatibility).

• Improved error messages reported by shader conductor to properly identify where individual error messages begin and end (and so ensure each compile error is reported on its own).

• Disabled the ZoomToFocus behavior when creating a usage node from the declaration - No longer zooms the focus of the editor since this was visually jarring for the user.

• Optimized material instance post-load in Editor builds by directly hashing the portions of shadermap ID used to construct the unique asset name, rather than constructing the full string representation then hashing.

• Added a Base field to Material Parameter Collections, which can be used to derive one collection from another, with the derived collection inheriting the base's properties.

• Added support for overriding a material's parameter collections with derived collections in material instances.

• Material scalar parameters can now optionally select an enumeration object to use for selecting scalar values by name in the material UI.

• Added default initialization of fields of FMaterialEnumerationEntry.

• Added function APIs to MaterialEditingLibrary to manipulate the new Enumeration material parameter.

• Reworked ShaderDebugData output to unify the "worker input" and "direct compile" debug mechanisms:

  • Removed r.ShaderCompiler.DebugDumpWorkerInputs cvar; always dump a valid worker input file for all jobs whenever debug info is enabled.

  • Moved writing of this file into job completion callbacks alongside the other debug artifacts, so will be written out for cache hits if r.ShaderCompiler.DumpDebugInfoForCacheHits is true.

  • Modified these files to not include a copy of the compressed source, instead using the .usf artifacts.

  • Renamed "direct compile" mode to "debug compile" and made it use this file instead of needing to serialize extra data into the debug .usf file.

  • Removed the r.DumpShaderDebugWorkerCommandLine cvar; all jobs will export a DebugCompileArgs.txt file containing the commandline that can be used to run SCW in debug compile mode by default.

  • Modified shader pipeline compile jobs to export a single worker input file (in the first stage's debug folder).

    • Each stage of a pipeline will export their own DebugCompileArgs.txt (for convenience, so if only a single stage fails you can still navigate to that stage's debug folder and run the job from there).

    • The debug compile for any pipeline stage will run the full pipeline job (so compilation always matches what happens in the normal context) with paths modified to be relative to that specific debug folder for convenience (so when downloading debug output from another machine, only one path in the commandline needs to be fixed up to run)

• When using the Material Editing Library of functions, now always refreshes the material instance editor when changing material instance parameters.

  • This fixes a bug where you would set a MI parameter via a python script and the MI Editor wouldn't update the properties panel to show the newly updated value.

  • Automatically call UMaterialEditingLibrary::UpdateMaterialInstance() whenever a parameter on a instance is set via the library.

  • UMaterialEditingLibrary::UpdateMaterialInstance should try to find any open material instance editors and tell them that the material instance has changed.

  • FMaterialInstanceEditor::NotifyExternalMaterialChange now calls `Refresh()` which will update the whole editor, including the property window, to properly reflect any parameter changes made by the library.

• Inconsistency fixed on Comment Bubbles on Material Editor:

  • To ensure visual consistency new Comment bubbles created use the same color value as the other node editors, like Blueprints.

• Material Editor: Added two experimental custom output nodes `Motion Vector World Offset (Per-Pixel)` and `Temporal Responsiveness` to give users a way to modify per pixel motion vectors and set how responsive the temporal history is.

  • Temporal Responsiveness: Describes how temporal history will be rejected for different velocity mismatch levels.

    • Default :0

    • Medium (0,0.5]

    • Full (0.5, 1.0].

    • Now, it will be used by TSR to change rejection heuristics. Translucency material can also use it to request higher responsiveness if depth is written (r.Velocity.TemporalResponsiveness.Supported=1) or clipped away (r.Velocity.OutputTranslucentClippedDepth.Supported=1).

    • The translucency mask generated improves TSR thin geometry quality.

  • Motion Vector World Offset (Per-Pixel): Works similar to the `Previous Frame` input of `Previous Frame Switch` but in the pixel shader. Regions with invalid velocity will be approximated with the current frame's offset.

    • This function currently supports non-nanite meshes only in non-basepass velocity write and is implemented in two passes. Use r.Velocity.PixelShaderMotionVectorWorldOffset.Supported to enable it.

• Added support for customizing the file name for ShaderSymbols and ShaderTypeStats output files.

• Exposed EMaterialProperty::MP_MaterialAttributes to Blueprints, Python, and the Editor UI.

  • This way users can use the Blueprint MaterialEditingLibrary to connect expressions to the MaterialAttributes output on the material block for materials that use MA.

• Added a MaterialEditingLibrary function called RenameMaterialParameterGroup and RenameMaterialFunctionParameterGroup which bulk renames all the Group Names on many Material Parameters at once.

  • Changed LogMaterialEditingLibrary verbosity to include `Log` messages.

  • Simply loop over all material expressions that are parameters and if the OldGroupName matches change the name to the new one.

  • Call RecompileMaterial to force the material to recompile so MIs update through the editor.

  • Unfortunately the `Group` property of material expressions is spread across many different classes. To avoid checking all the different material expression types (there are 8 different UMaterialExpression classes with their own unique Group), I've opted for a property system approach that looks for the property by name.

• Optimize pipeline cache to reduce single allocation size and improve performance by copying less data on resize.

• Modified output of shader formats using DXC (DXIL output) to keep the reflection data in the DXIL container if the r.Shaders.ExtraData cvar is enabled. This is a workaround for graphics tools which cannot correctly re-generate reflection information from external PDBs.

  • Note that this bloats runtime memory usage so should only be enabled locally if you are encountering issues seeing data formats (i.e. cbuffer layouts) in such tools.

• Can now copy/paste material errors in the PlatformStats panel.

  • Simply makes the text read-only "editable" so the user can select the text and get automatic copy/paste functionality.

• Rename the aliases for the Convert node from `Make Float4` to `Make Vector4` to match "Vector Parameter" and "Constant Vectors'.

  • This also avoids confusion with the existing Make Float 4 Engine Material functions.

• Added additional project-specific texture groups.

• Vector Parameter Expression now shows output pin display names to avoid confusion on what the first output pin is.

  • Also fixed "Convert to Constant" for vector parameters. By default the outputs are now:

    • RGB

    • R

    • G

    • B

    • RGBA

  • Users were expecting the first output pin to be RGBA, but it was RGB.

  • Now shows output name on pins by default for vector parameter.

  • Added RGBA output as the final one to match what TextureSample does.

  • Updated this behavior in the new material translator (it should really use the outputs array which is already defined).

  • If no channel names are specified show R, G, B by default.

  • No longer truncates and loses user data when using "Convert to Constant" for Vector Parameter -> Constant.

  • Gave constant 4 expression display names so the conversion code can match outputs by name when converting nodes.

• Marked deprecated virtual functions from MaterialInterface and FMaterial as final to avoid silent errors.

  • Modified all derived classes to override the right functions.

• Improved IO performance of FinishPopulateShaderLibrary.

• Added a new debug artifact (ShaderTypeStats.csv), dumped by default for all cooks to the ShaderDebugInfo folder for each shader format.

  • This CSV file contains permutation counts/code sizes for all shaders in the shader library, grouped by shader type.

  • Note that this is not directly representative of final shader memory usage since it doesn't account for potential duplication of bytecode introduced by the pak chunking step (where shaders used in multiple pakfiles will have a copy in each).

  • This is only intended to be used as a tool for tracking and comparing shader growth over time or between cooks.

• Subsurface Profile: Improved neighborhood validation for checkerboard when enabled, less bleeding into subsurface scattering region for low res.

Bug Fix:

• Virtual Texture Pending Mips debug view now takes screen scaling into account.

• Fixed UMaterialExpressionParticleSubUV::Compile bug that caused the node not to use the texture object connected to the Texture input pin.

• Repaired cook editor-only-data nondeterminancy in materials.

• Ensured that FDefaultMaterialInstance's CacheUniformExpression is cancelled on destroy if still pending.

  • Under certain conditions the FDefaultMaterialInstance could be destroyed and subsequent dispatch of CacheUniformExpression would result in a crash due to a dangling reference. This replicates functionality from FMaterialInstanceResource for which this guard is already implemented.

• Fixed a potential out-of-bounds read when remapping shader compile diagnostic messages; could occur if there were no digits before the end of the line in the diagnostic message after the __UE_FILENAME_SENTINEL marker.

• Fixed material shader map not releasing compilation ID if shaders failed to compile.

• Fixed incorrect reporting of line numbers when compile errors are encountered in generated material code.

  • The code calculating the line number offset of the substituted #line directive in MaterialTemplate.ush was incorrect.

• Fixed a bug that could cause a retry loop when running with shader development mode enabled and a preprocessing failure is encountered.

• Fixed crash in SafeRenameEditorOnlyData() when EditorOnlyCurrent is null.

• Fixed a material derivative autogen crash when dealing with uints.

• Fixed a crash occurring when the material parent of an instance is changed through scripting.

• Fixed ShadingModel material expression in-node combobox to display only valid shading model entries.

• Made a minor fix for custom ShaderTypeStats customized name, needs to lookup cvar by ShaderFormat.

• Added support for Nanite Geometry Collections to Preskinned Local Bounds material node.

• Fixed an issue where the Vulkan shader pipeline cache would sometimes incorrectly produce cache misses for shaders that had already been compiled and serialized.

• Fixed shader output for preview/transient materials being cached in DDC.

• Changed UMaterialFunctionInterface to include the BlueprintType annotation.

• Removed incorrect application of the component scale to the output of World Space Vertex Normal node when used with skinned mesh.

• Fixed an uncommon crash in Lerp material expression when the alpha pin was connected to a non-primitive output.

MegaLights

New:

• Implemented MegaLights-driven VSM marking to only mark VSM pages that MegaLights has selected samples for.

• Added the r.MegaLights.DownsampleCheckerboard, which can run sampling/tracing at half res (every other pixel). It's a good middle ground between default quarter res sampling and option full resolution sampling.

• Exposed r.MegaLights.HardwareRayTracing.ForceTwoSided, which allows to flip between matching raster behavior and forcing two-sided on all geometries in order to speedup tracing.

• Now always vectorize shading samples. This saves on average 0.1-0.2ms in complex content on current gen consoles.

• Improved spatial denoiser filtering after disocclusion.

• Limited number of samples sent towards the directional lights to a specified fraction (r.MegaLights.DirectionalLightSampleFraction). This helps with noise indoors, where there's a strong directional light inside taking over the entire sampling budget.

• Now uses downsampled neighborhood for temporal accumulation. Interpolated pixels don't add much to neighborhood stats, so we can skip them, improving quality by effectively using a wider neighborhood filter. This also improves performance of the temporal accumulation pass, as it now can load less data into LDS.

• Now properly handle invalid sample upsampling. Sometimes during upsampling we can't find any valid sample and need to fallback to history (without any neighborhood clamp). This makes lighting on highly detailed or thin geometry a bit sharper and a bit more stable.

• Disabled guiding tile filtering and added stochastic bilinear sampling of guiding tiles in order to hide tile artifacts.

• Now merge identical rays in order to avoid overhead of duplicated traces. Duplicated rays happen with strong point lights, where we may send a few identical rays to the same light doing unnecessary work.

• Added screen space trace for hair (r.MegaLights.Hair.ScreenTraces). Screen space traces improve card hair quality compared to approximate RT fallback mesh, but can be noisy. In order to reduce the noise there's now extra hair only screen space trace bias (r.MegaLights.Hair.ScreenTraces.Bias).

• Merged downsample factor / checkboard CVars into a single r.MegaLights.DownsampleMode CVar.

Bug Fix:

• Now require ray tracing platform support, in order to skip compiling and cooking MegaLights shaders on certain platforms.

• Fixed split screen crash due to out of bounds memory reads.

• Fixed denoiser artifacts on borders between dielectrics and metals (bright outlines) caused by too aggressive material demodulation factors.

Nanite

New:

• The dithered opacity mask option is now supported for Nanite rasterization.

• Added a new culling check that can improve Nanite culling speed and reduce the amount of memory needed for candidate clusters (r.Nanite.Culling.MinLOD).

• Added support for rendering Nanite skinned meshes in the animation editor.

• Exposed NanitePixelProgrammableDistance for Nanite skinned meshes to enable forcibly disabling pixel programmable rasterization of Nanite when the mesh is further than a given distance from the camera.

• Added experimental and optional passes to prime the HZB before VisBuffer rendering if the HZB is missing (e.g., due to a camera cut), see cvar r.Nanite.PrimeHZB et al.

  • The main idea is to draw a lower resolution (HZB or lower) and lower detail (by using LOD bias and/or drawing only ray tracing far field scene geometry).

  • This new render is then used to build a HZB with some depth bias that is then used to render the full scene, greatly improving the cost in many cases.

• GeometryCollection: Added a "Nanite Minimum Residency" setting for Geometry Collection assets. This controls the number of resident nanite root pages.

  • Previously we used a single root page and this is still the default.

  • Increasing the value can avoid pop-in when a Geometry Collection is first shown.

• Added support for disabling "Render In Main Pass" on static mesh components for Nanite meshes.

Bug Fix:

• Fixed a bug where the World Position node would return incorrect results when used to calculate opacity in a masked material.

• Automatically disable Software VRS when Nanite is not enabled, preventing it from generating shading rate images which will not be used.

• Fixed a rare streamer crash that could occur when a streaming page is resident in the streaming pool while its root page slot gets reused a multiple of 256 times.

• Invalid page requests from the GPU are now ignored and optionally logged, instead of potentially resulting in a crash.

• Suppressed console warning spam when `r.Nanite.Visualize` is set to an invalid value.

• Fixed an incorrect conservative instance draw distance test used in the hierarchical instance culling that caused missing instances.

• Nanite: Fixed incorrect geometric normal when using r.RayTracing.Nanite.Mode=1.

• Fixed a GPU crash that could occur when Nanite was rendering to odd viewport sizes.

• Fixed a crash in Nanite primitive filtering that can happen if HLOD force-hidden primitives, or the view's ShowOnlyPrimitives/HiddenPrimitives, contain invalid primitive IDs when there are no primitives in GPU scene.

• Fixed a regression where if a static mesh has multiple mesh sections of the same material, Nanite build would merge them into a single mesh section, which could cause them to be re-ordered and cause issues. Now the multiple mesh sections remain intact, but the fallback will not have triangles in the duplicated sections.

• Fixed an issue where the sign of the TwoSidedSign node would be flipped for masked materials.

• Fixed a crash caused by enabling a Nanite visualization mode when instanced stereo rendering is enabled.

• Fixed an issue where MaxHierarchyDepth was not calculated correctly, which could under rare circumstances result in streaming not progressing beyond a certain point.

• Fixed an issue where having a non-Nanite capture in the scene can cause the Nanite streamer to not get updated and result in GPU hangs.

• Fixed an issue where scene captures and main view rendering would independently try to update residency, sometimes resulting in visual artifacts.

Niagara

New:

• CascadeToNiagaraConverter: Can now add template emitters.

• Supported read / write icons for stateless: You can now more easily see where bindings are used in LW emitters.

• Added a way to release resources from render target 2D:

  • Changed handling of null texture to set the material default to avoid dangling references.

• Removed slate dependency from emitter merging (used by python scripts), which could trip up commandlets that ran without the editor UI.

• Other distribution types can now opt into indexing / address / interpolation.

• Initialize particle add lookup value mode options:

  • Added initial look up value mode enum.

  • Enabled lookup on initial position.

  • Changed color to a distribution.

• Added getter method for Niagara parameters.

• Lazy instantiate parts of the baker to reduce memory usage:  Added a call to tick the baker world as paused, this ensures the world manager is called to process clean up functions.

• Arrays for LW distributions:

  • Made a large refactor to make reading a distribution a function call vs a structure.

  • When sampling a value needed for motion vectors pass in multiple time parameters and it will return both values to ensure random is respected.

  • Some limited space was added to pack indexing into the data, this can be controlled using meta data on the distribution property.

  • GPU storage moved to ByteAddressBuffer for LoadX operations which gave a small speed boost.

  • Perf on a large number of particles was marginally better vs before.

• LWE:

  • Added support for debug HUD particle attribute display.

  • Added support to data set readback.

• Adjusted display name for SKM / SM DIs to remove confusion between the asset types.

• Changed pin color based on Data Interface vs UObject to reduce confusion.

• LWE Shape Location Changes:

  • Added shape scale.

  • Fixed plane shape not applying rotation.

  • Added surface mode to the cylinder.

• Material Parameter Collection Data Interface: You can now push scalar / vector parameters from Niagara to MPCs.

• Removed UNiagaraEmitter from stateless emitter on cook.

  • The cooked build does not require them, various parts of the UI still make assumptions and will be cleaned up.

  • This saves ~4k per stateless emitter.

• Added rotator distribution to stateless & use in shape location to allow the rotation to be bound to an attribute.

  • Fixed the axis not properly being used on the display name for each widget.

  • Fixed the same binding being added multiple times.

• Niagara Editor Preview Actor:

  • Used for previewing and tuning Niagara Systems without the need to run PIE.

  • Has some simple default motion options which can be overridden by a derived Blueprint for more complex behavior.

• Niagara Fluids: Added vector controls for turbulence frequency and gain.

• Niagara Content: Added distribution curve dynamic inputs for float, vector, and vector2D types.

• Weighted Distribution Int Array:

  • Each entry has a value & weight.

  • The Weight is used in the random calculation, so the higher the weight the more likely it is to return that value.

• CascadeToNiagaraConverter: Added UPROPERTY() tags.

• When changing the preview platform, now invalidate the cooked status.

  • We need to make sure everything is in sync when the device profile changes to avoid crashes inside the VM.

• Added Niagara to Visuals placement menu.

• Updated Stateless Rotate Around Point module:

  • Added coordinate space / rotation / center.

  • Added a CPU path for the module.

  • Added Debug Draw support.

• Added a property to customize quick capture number of frames.

• Added ID support to Sim Cache Reader.

• Added wildcard name match exclusions to sim cache compare.

• Validation rules can now be disabled by config file.

• Added information about who is using sorting.

  • Added a marker to sort key generation.

  • Added a console variable fx.Niagara.Batcher.DumpSortedSimulations which can be used to dump to the log.

• Changed the color grad editor stop time widget to use the spin box.

  • This allows for math operations and validation of the input data.

• Dynamic Mesh Sim Cache Storage + Visualizer.

• Added all base Niagara float types to sim cache interpolation.

  • Enabled by default can be disabled by changing bInterpolateAllTypes in the creation parameters.

  • This improves MRQ renders with temporal samples.

• Added concurrent sim cache reading when no data interfaces are cached.

  • Can be disabled using "fx.Niagara.SystemSimulation.AllowASyncSimCache".

  • Enabled concurrent execution for fixed DT systems if it's a single tick.

  • Fixed a bug in the component recaching where it ran all the time in the editor.

• Stateless Curve Editor Improvements:

  • Moved the existing LW curve editor into the compact curve editor.

  • Added a new curve editor for distributions which is closer to the existing curve editor.

  • Exposed some of the common widgets shared between the editors.

  • Future change will be to wrap the DI inside the distribution adapter and share the editors, which will be useful for the compact editor also

• Made the FXSystemInterface sharable to fix world tear down reference issues.

  • In some situations an FX component can be destroyed after the world.

  • When the world is destroyed it will destroy the FX system set, which will enqueue a command to destroy the FX interfaces.

  • The render command can execute before the FX component's are destroyed leaving them with a dangling reference.

• Added a setting to enable HLSL 2021 in Niagara.

  • HLSL 2021 features will fail to compile on the VM and on some platforms, but this allows users to experiment.

• Added an enum for notify progress, none / forward / reverse.

  • Fixes issues around using negative rate scaling and allows the user to still use 0-1 when playing backwards.

• Disable Source Mode with LWE to reduce confusion.

  • We don't have a particle stack so there is no way to modify the data without binding to system / user parameters.

• Added console commands (fx.Niagara.Component.ReinitializeActive & fx.Niagara.Component.DeactivateActive) to allow a quick way to kill / restart Niagara components.

  • Cleaned up various console variables while I was here.

• Niagara: Properties (Section Start Behavior, Section Evaluate Behavior, Section End Behavior, Age Update Mode, Allow Scalability) in UMovieSceneNiagaraSystemSpawnSection can now be set in Blueprints / Python.

• Multiply the debug draw color by alpha so we can have translucent lines.

• Now send the current bounds to the GPU for the emitter properties DI.

  • This makes the result of GetBounds consistent between both paths when using fixed bounds on the emitter.

• Removed stateless emitters from compilation.

  • Previously they would still generate some HLSL data resulting in compilation when added / removed.

  • Cleaned up several areas that assumed Emitter Data would always be valid.

• Made renderer memory savings by reducing FNiagaraVariableAttributeBinding.

  • Sprites 1992 -> 1320 = 672

  • Mesh 1688 -> 1160 = 528

  • Ribbon 1888 -> 1312 = 576

  • Light 800 -> 560 = 240

• Added a rule for validating material usage in renderers.

  • This makes it possible to block content that does not have the appropriate usage flags set.

• Niagara Content:

  • Added a new dynamic input to support querying values from the new Weighted Distribution Int Array data interface.

  • Added new modules for spawning particles from simulation caches.

• Removed all the async optimize / decompression of VM byte code.

  • The new VM does not use this path so the code is dead.

• Enabled Sub UV cutouts ES3.1.

• Can now use the Niagara Data Interface to set material parameters on Material Instance Dynamic objects, from a CPU stage.

• CascadeToNiagaraConverter: Add more script input types.

• Added Shift+D to enable selected emitters (reverse of D which disables selected emitters).

• Refactored renderer widgets to share code and use small chip

• Added a menu entry when we have no stateless bindings to make it clear to the user what type we are looking for.

• Added a debug draw to renderers.

  • Implemented debug draw for light & decal renderer.

• Added column sorting to sim cache viewer.

  • Also cleaned up how we build the table data to make it less confusing.

Bug Fix:

• Fixed issue where ParticleSystem EPSUM_FixedTime had no effect due to incorrect assignment.

• Fixed validation accidentally changing usage with flags on materials.

  • CheckMaterialUsage will both check and set which can result in a race with shader compilation.

• Use the component transform for local space vs the simulation one - When disabling requires current frame data (for performance) these could be out of sync, which mismatches other renderers on the RT (i.e. sprites & meshes)

• Fixed hash function in data channel to use full string data instead of just half of it.

• LWE: Set the sim target on the compiled data set to match the mode.

  • This fixes a mismatch that can cause attributes to not upload to the GPU when we are in CPU mode due to using the light / decal renderer.

• No longer call the OnSystemFinished delegate if we are constructing Blueprints.

  • The delegate might interfere with the actor / components and can cause crashes.

• Shader loading: Now prevent dereferencing potential nullptr when file is not found.

• Fixed emitter renderer tick ordering issue when combined with LWE.

• Added missing postload calls for stateless emitters.

• Guarded against using EmitterData as it can be nullptr.

• Fixed binding buffer changes causing dispatches to serialize on some RHIs.

• Fixed potential OOB reads if a binding is invalid.

• Added a lock to GPU Sort Manager AddTask to ensure no concurrent access.

  • This fixes a race between Niagara & Cascade adding tasks.

• Now calculate spawn probability per particle for spawn rate, rather than per loop.

• Fixed user variables being removed and renderers not updating correctly.

  • The variable was without namespace so failed to match.

• Added a missing null check for the graph source that can happen during undo.

• Fixed GetResourceSizeEx miscalculating for non-isotropic UTextureRenderTargetVolume.

• Niagara component renderer: now only register one object replacement delegate with the CDO to prevent races during asset loading.

• Added missing CanBind to user parameters.

  • Changed style of binding to be more consistent with other bindings.

• Now sets the world time information in the baker.

  • This fixes things like Engine.Time always being 0.0 and material based time effects not working as expected.

• Used GroupMemoryBarrierWithGroupSync with Radix Sort to fix issues on various GPUs.

• No longer load niagara system when getting asset registry tags, to prevent deadlocks during emitter merging.

• Disabled low latency when anything other than the lit view mode is active.

  • Some of the view modes short circuit rendering so the data may not be ready in time.

• Fixed a crash when copying script variable metadata.

• Handled null data interface inside Niagara Variant.

  • It is unclear how the variant DI becomes nullptr at the moment, this will at least avoid crashing the editor, but more investigation is required to understand why.

• Fixed duplicating an emitter with RunUpdateScript set for interpolation mode changing post duplication to NoInterpolation.

• Fixed single segment GPU ribbon UV calculations being incorrect.

• Fixed a potential use-after-free on world tear down.

  • If the compute interface is marked pending kill we can ignore sending the command to remove from the computer interface as it will be killed before.

• Fixed an asan issue using the component in the lambda.

  • Bring changes over for garbage references also.

• Fixed incorrect stride with FRibbonAccumulationValues when using different features.

• Fixed color curves not working inside NPCs when using GPU emitters.

• When modifying parameters in the detail panel, now use the editor setting GetResetSimulationOnParameterChange to see if we should reset the system or not.

  • Disabling reset can be useful to iterate on content live.

• Fixed editor undo crashing due to order being out of sync and the thumbnails.

• Fixed update context killing systems that are waiting for compilation.

  • When switching preview modes the update context is called multiple times.

  • The first time it's considered active.

  • The next time it's no longer active but is waiting for compilation (compontent ticking) so is now removed from the reactivate list.

  • We now check if the component tick is enabled due to waiting for compilation results.

• When setting up previous data use current if previous does not exist.

  • Current changing to a new position binding which does not have a previous value generated it would use the default position which is 0,0,0. Using the current value won't produce corrupt motion vectors, but will also not produce correct motion vectors.

• Changed default for LOD size Y to -1 to fix issue with meshes being culled incorrectly.

  • A value of -1 indicates that it will never be culled by screen size.

  • The previous value of 2 would be adjusted to 1.0 and fail the >= screen size test if bounds were large enough.

• Now uses the aliased variable when finding the default mode

  • This fixes an issue if the first time a variable was encountered it was in StackContext as we would ignore the binding.

• Fixed a bug where min instead of max distance was used as LoD parameter.

  • Fixed a nullptr and weak ptr bug in error log format.

  • Fixed a bug when an error during script merge occurs.

• Fixed memory leak in data channel object destructor.

Path Tracer

New:

• Improved the adaptive sampling heuristic.

• Added an option to hide the planet ground surface.

  • When using reference atmosphere mode, the path tracer no longer displays a large ground sphere to represent the planet for better parity with the deferred renderer.

  • The old behavior of showing the planet ground can be accessed by the cvar r.PathTracing.EnableAtmosphereGround.

• Post-process materials can now be specialized for the path tracer.

  • This adds a permutation of the PostProcess Material that is used when the path tracer is enabled on the view.

  • This can be used to account for differences in how the path tracer creates the image. Behavior can be customized with the PathTracingQualitySwitch node.