FGeomCacheTrackProxy | Unreal Engine 5.5 Documentation

Unreal Engine C++ API Reference > Plugins > GeometryCache

Inheritance Hierarchy

References


Module	GeometryCache
Header	/Engine/Plugins/Runtime/GeometryCache/Source/GeometryCache/Public/GeometryCacheSceneProxy.h
Include	#include "GeometryCacheSceneProxy.h"

Syntax

class FGeomCacheTrackProxy : private FGeomCacheTrackProxyFixLayout

Remarks

This the track proxy has some "double double buffering" going on. First we keep two mesh frames. The one just before the current time and the one just after the current time. This is the full mesh and we interpolate between it to derive the actual mesh for the exact time we're at. Secondly we have two position buffers. The one for the current rendered frame and the one from the previous rendered frame (this is not the same as the mesh frame, the mesh may be at say 10 fps then get interpolated to 60 fps rendered frames)

Variables

Type	Name	Description
bool	bNextFrameMeshDataSelected	Flag to indicate which frame mesh data was selected during the update
bool	bResourcesInitialized
FGeomCacheColorBuffer	ColorBuffer
uint32	CurrentPositionBufferIndex
int32	FrameIndex	Frame numbers corresponding to MeshData, NextFrameMeshData
FGeomCacheIndexBuffer	IndexBuffer	Index buffer for this Track
float	InterpolationFactor
TArray< UMaterialInterface * >	Materials	Material applied to this Track
FGeometryCacheMeshData *	MeshData	MeshData storing information used for rendering this Track
int32	NextFrameIndex
FGeometryCacheMeshData *	NextFrameMeshData
uint32[2]	PositionBufferFrameIndices
float[2]	PositionBufferFrameTimes
FGeomCacheVertexBuffer[2]	PositionBuffers	Vertex buffers for this Track.
int32	PreviousFrameIndex
float	PreviousInterpolationFactor
float	SubframeInterpolationFactor
FGeomCacheTangentBuffer	TangentXBuffer
FGeomCacheTangentBuffer	TangentZBuffer
FGeomCacheVertexBuffer	TextureCoordinatesBuffer
UGeometryCacheTrack *	Track	The GeometryCacheTrack to which the proxy is associated
int32	UploadedSampleIndex
FGeomCacheVertexFactory	VertexFactory	Vertex factory for this Track
FMatrix	WorldMatrix	World Matrix for this Track

Constructors

	Type	Name	Description
		FGeomCacheTrackProxy ( ERHIFeatureLevel::Type InFeatureLevel )

Destructors

	Type	Name	Description
		~FGeomCacheTrackProxy ()

Functions

Type	Name	Description
void	FindSampleIndexesFromTime ( float Time, bool bLooping, bool bIsPlayingBackwards, int32& OutFrameIndex, int32& OutNextFrameIndex, float& InInterpolationFactor )	Find the two frames closest to the given time InterpolationFactor gives the position of the requested time slot between the two returned frames.
bool	GetMeshData ( int32 SampleIndex, FGeometryCacheMeshData& OutMeshData )	Get the MeshData for a given SampleIndex
const FVisibilitySample &	GetVisibilitySample ( float Time, const bool bLooping )	Get the VisibilitySample for a given time
void	InitRenderResources ( FRHICommandListBase& RHICmdList, int32 NumVertices, int32 NumIndices )	Initialize the render resources. Must be called before the render resources are used.
bool	IsTopologyCompatible ( int32 SampleIndexA, int32 SampleIndexB )	Check if the topology of two given SampleIndexes are compatible (ie. same topology)
bool	UpdateMeshData ( float Time, bool bLooping, int32& InOutMeshSampleIndex, FGeometryCacheMeshData& OutMeshData )	Update the SampleIndex and MeshData for a given time

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