UMovieSceneAnimTransitionSectionBase

Abstract base class for all Anim Mixer transition section types.

API > API/Plugins > API/Plugins/MovieSceneAnimMixer

Abstract base class for all Anim Mixer transition section types. Transition sections handle blending between two overlapping animation sections on the same layer.

Transition tasks follow a create-once, update-each-frame pattern:

CreateTransitionTask() is called once during entity import to create the task

The mixer system calls Update() on the task each frame to set from/to tasks and timing

The task persists as an entity component, allowing it to maintain state across frames

   
Name UMovieSceneAnimTransitionSectionBase
Type class
Header File /Engine/Plugins/Experimental/MovieSceneAnimMixer/Source/MovieSceneAnimMixer/Public/MovieSceneAnimTransitionSectionBase.h
Include Path #include "MovieSceneAnimTransitionSectionBase.h"

Syntax

UCLASS (Abstract, MinimalAPI)  
class UMovieSceneAnimTransitionSectionBase :  
    public UMovieSceneSection ,  
    public IMovieSceneEntityProvider ,  
    public IMovieSceneAnimationMixerItemInterface

Inheritance Hierarchy

Implements Interfaces

Derived Classes

Constructors

Name Remarks Include Path Unreal Specifiers

UMovieSceneAnimTransitionSectionBase ( const FObjectInitializer& ObjInit
)

   MovieSceneAnimTransitionSectionBase.h  

Variables

Public

Name Type Remarks Include Path Unreal Specifiers
FromSection TObjectPtr< UMovieSceneSection > The section that this transition blends FROM (earlier in time) MovieSceneAnimTransitionSectionBase.h  
ToSection TObjectPtr< UMovieSceneSection > The section that this transition blends TO (later in time) MovieSceneAnimTransitionSectionBase.h  

Functions

Public

Name Remarks Include Path Unreal Specifiers

TRange< FFrameNumber > ComputeOverlapRange()

 Get the computed overlap range between from and to sections MovieSceneAnimTransitionSectionBase.h  

float GetTransitionProgress ( FFrameTime InTime
) const

 Get transition progress [0,1] at the given time. 0 = start of transition, 1 = end MovieSceneAnimTransitionSectionBase.h  

bool IsValid()

 Check if this transition is structurally valid (sections exist, same row, bounded, overlap exists, neither fully contained) MovieSceneAnimTransitionSectionBase.h  

void ScaleKeysToRange ( const TRange< FFrameNumber >& OldRange,
const TRange< FFrameNumber >& NewRange
)

 Scale blend weight keys proportionally from old range to new range MovieSceneAnimTransitionSectionBase.h  

bool UpdateBoundsFromSourceSections()

 Update this transition's bounds to match the current overlap of from/to sections MovieSceneAnimTransitionSectionBase.h  

Public Virtual

Name Remarks Include Path Unreal Specifiers

virtual EMovieSceneChannelProxyType CacheChannelProxy()

   MovieSceneAnimTransitionSectionBase.h  
Create the evaluation task for this transition. MovieSceneAnimTransitionSectionBase.h  
Get the blend weight channel for evaluation. MovieSceneAnimTransitionSectionBase.h  

virtual FText GetTransitionDisplayName()

 Get a short display name for this transition type. Used for tooltips and other UI elements. MovieSceneAnimTransitionSectionBase.h  
Get the icon style name for this transition type. MovieSceneAnimTransitionSectionBase.h  

virtual void ImportEntityImpl ( UMovieSceneEntitySystemLinker* EntityLinker,
const FEntityImportParams& Params,
FImportedEntity* OutImportedEntity
)

   MovieSceneAnimTransitionSectionBase.h  

virtual void InitializeDefaultCurve()

 Called after the section range is set to initialize any default curves/channels MovieSceneAnimTransitionSectionBase.h  

virtual bool PopulateEvaluationFieldImpl ( const TRange< FFrameNumber >& EffectiveRange,
const FMovieSceneEvaluationFieldEntityMetaData& InMetaData,
FMovieSceneEntityComponentFieldBuilder* OutFieldBuilder
)

   MovieSceneAnimTransitionSectionBase.h  

Overridden from UMovieSceneSection

Name Remarks Include Path Unreal Specifiers

virtual bool IsLocalEvalDisabled()

   MovieSceneAnimTransitionSectionBase.h  

Overridden from IMovieSceneAnimationMixerItemInterface

Name Remarks Include Path Unreal Specifiers

virtual FColor GetMixerItemTint()

   MovieSceneAnimTransitionSectionBase.h  

virtual bool IsVisibleInAddSectionMenu()

   MovieSceneAnimTransitionSectionBase.h  

virtual bool SupportsVerticalDragging()

   MovieSceneAnimTransitionSectionBase.h  

Protected Virtual

Name Remarks Include Path Unreal Specifiers

virtual void RebuildChannelProxy ( FMovieSceneChannelProxyData& Channels
)

 Subclasses implement to register their specific channels MovieSceneAnimTransitionSectionBase.h  

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