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> Unreal Engine API Reference > Plugins > GeometryCache > FGeomCacheTrackProxy

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FGeomCacheTrackProxy

This the track proxy has some "double double buffering" going on.

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Inheritance Hierarchy

FGeomCacheTrackProxy

FGeomCacheTrackAbcFileProxy

References

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

Syntax

class FGeomCacheTrackProxy

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

	Name	Description
FGeomCacheVerte...	ColorBuffer
uint32	CurrentPositionBufferIndex
int32	FrameIndex	Frame numbers corresponding to MeshData, NextFrameMeshData
FGeomCacheIndex...	IndexBuffer	Index buffer for this Track
float	InterpolationFactor
TArray< UMateri...	Materials	Material applied to this Track
FGeometryCacheM...	MeshData	MeshData storing information used for rendering this Track
int32	NextFrameIndex
FGeometryCacheM...	NextFrameMeshData
uint32[2]	PositionBufferFrameIndices
float[2]	PositionBufferFrameTimes
FGeomCacheVerte...	PositionBuffers	Vertex buffers for this Track.
FGeomCacheVerte...	TangentXBuffer
FGeomCacheVerte...	TangentZBuffer
FGeomCacheVerte...	TextureCoordinatesBuffer
UGeometryCacheT...	Track	The GeometryCacheTrack to which the proxy is associated
int32	UploadedSampleIndex
FGeomCacheVerte...	VertexFactory	Vertex factory for this Track
FMatrix	WorldMatrix	World Matrix for this Track

Constructors

	Name	Description
	FGeomCacheTrackProxy ( ERHIFeatureLevel::Type InFeatureLev... )

Destructors

	Name	Description
	~FGeomCacheTrackProxy()

Functions

	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& OutMeshDat... )	Get the MeshData for a given SampleIndex
const FVisib...	GetVisibilitySample ( float Time, const bool bLooping )	Get the VisibilitySample for a given time
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& OutMeshDat... )	Update the SampleIndex and MeshData for a given time

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