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> Unreal Engine API Reference > Developer > MeshMergeUtilities > FMeshMergeDataTracker

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FMeshMergeDataTracker

Used to keep track of in-flight data while meshes are merged and their corresponding materials baked down

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References

Module	MeshMergeUtilities
Header	/Engine/Source/Developer/MeshMergeUtilities/Public/MeshMergeDataTracker.h
Include	#include "MeshMergeDataTracker.h"

Syntax

class FMeshMergeDataTracker

Remarks

Used to keep track of in-flight data while meshes are merged and their corresponding materials baked down

Variables

	Name	Description
int32	AvailableLightMapUVChannel	First available UV channel across all RawMesh entries
bool[8][MAX_MES...	bOcuppiedUVChannels
bool[8]	bWithVertexColors	Flags for UV and vertex color usage
TMap< FMeshLODK...	ComponentToWedgeOffsets
TMap< FMeshLODK...	LightmapChannelLODs	Mesh / LOD index, lightmap channel.
TArray< int32 >	LODIndices	All LOD indices which should be populated in the final merged mesh
TMap< UMaterial...	MaterialInterfaceToMaterialSlotName	Use this map to recycle the material slot name.
TMap< FMeshLODK...	RawMeshLODs	Mesh / LOD index, RawMesh.
TArray< FMeshLO...	RequiresUniqueUVs	Whether a key requires unique UVs.
int32	SummedLightMapPixels
TMultiMap< FMes...	UniqueSectionIndexPerLOD	Remapping pairs for each mesh and LOD index combination
TArray< FSectio...	UniqueSections	Unique set of sections in mesh
TMultiMap< uint...	UniqueSectionToMeshLOD	Maps from each unique section index to all the RawMesh entries which contain an original section that's mapped to it

Constructors

	Name	Description
	FMeshMergeDataTracker()

Functions

	Name	Description
FMeshDescrip...	AddAndRetrieveRawMesh ( int32 MeshIndex, int32 LODIndex, UStaticMesh* InMesh )	Adds or retrieves raw mesh data for the mesh and LOD index
void	AddBakedMaterialSection ( const FSectionInfo& SectionInfo )	Clears out unique section to be replaced with the baked material one
void	AddComponentToWedgeMapping ( int32 MeshIndex, int32 LODIndex, uint32 WedgeIndex )
void	AddLightmapChannelRecord ( int32 MeshIndex, int32 LODIndex, int32 LightmapChannelIndex )	Adds a record of what channel lightmap data is stored at
void	AddLightMapPixels ( int32 Pixels )	Add number of lightmap pixels used for one of the Meshes
void	AddLODIndex ( int32 LODIndex )	Adds a LOD index which will be part of the final merged mesh
void	AddMaterialSlotName ( UMaterialInterface* MaterialIn..., FName MaterialSlotName )	Add a material slot name for a unique material instance.
int32	AddSection ( const FSectionInfo& SectionInfo )	Adds (unique) section to stored data
void	AddSectionRemapping ( int32 MeshIndex, int32 LODIndex, int32 OriginalIndex, int32 UniqueIndex )	Adding a mapping between the index for an original mesh section index and the mesh section it will be indexed to in the final mesh
bool	DoesAnyLODContainVertexColors()	Returns whether or not any raw mesh entry contains vertex colors for any LOD index
bool	DoesLODContainVertexColors ( int32 LODIndex )	Returns whether or not any raw mesh entry contains vertex colors for the specified LOD index
bool	DoesMeshLODRequireUniqueUVs ( FMeshLODKey Key )	Returns whether or not the raw mesh entry for the given MeshLOD key requires unique UVs for baking out its material(s)
bool	DoesUVChannelContainData ( int32 UVChannel, int32 LODIndex )	Returns whether or not any raw mesh entry contains texture coordinates for the specified UV channel and LOD index
bool	DoesUVChannelContainData ( int32 UVChannel )	Returns whether or not any raw mesh entry contains texture coordinates for the specified UV channel and any LOD index
FMeshDescrip...	FindRawMeshAndLODIndex ( int32 MeshIndex, int32& OutLODIndex )	Tries to retrieve a FMeshDescription and returns the LOD index it found an entry for
int32	GetAvailableLightMapUVChannel()	Returns the first available UV channel across all raw mesh entries, which will be a good fit for the lightmap UV index in the final mesh
uint32	GetComponentToWedgeMappng ( int32 MeshIndex, int32 LODIndex )
TConstRawMes...	GetConstRawMeshIterator()	Returns a const key/value iterator for the FMeshDescription entries
int32	GetLightMapDimension()	Returns the texture dimension required to distribute all of the lightmap pixels
TConstLODInd...	GetLODIndexIterator()	Iterates over LOD indices for mesh
void	GetMappingsForMeshLOD ( FMeshLODKey Key, TArray< SectionRemapPair >& InOutM... )	Retrieves all section mappings for the MeshLOD key
UMaterialInt...	GetMaterialForSectionIndex ( int32 SectionIndex )	Returns the material used by the unique section
FName	GetMaterialSlotName ( UMaterialInterface* MaterialIn... )	Get the material slot name from a unique material instance.
void	GetMeshLODsMappedToUniqueSection ( int32 UniqueIndex, TArray< FMeshLODKey >& InOutMeshLO... )	Retrieves the MeshLOD keys from which the original sections are mapped to the unique section index
int32	GetNumLODsForMergedMesh()	Retrieves number of LODs part of the final merged mesh
TRawMeshIter...	GetRawMeshIterator()	Returns a non-const key/value iterator for the FMeshDescription entries
FMeshDescrip...	GetRawMeshPtr ( FMeshLODKey Key )	Retrieves Raw Mesh ptr for the given MeshLOD key
FMeshDescrip...	GetRawMeshPtr ( int32 MeshIndex, int32 LODIndex )	Retrieves Raw Mesh ptr for the given mesh and LOD index
const FSecti...	GetSection ( int32 SectionIndex )	Returns the unique section instance
int32	NumberOfUniqueSections()	Returns the number of unique sections
void	ProcessRawMeshes()	Looks at all available raw mesh data and processes it to populate some flags
void	RemoveRawMesh ( int32 MeshIndex, int32 LODIndex )	Removes raw mesh entry for the given mesh and LOD index
FMeshDescrip...	TryFindRawMeshForLOD ( int32 MeshIndex, int32& InOutDesiredLODIndex )	Tries to retrieve a FMeshDescription for the given mesh and LOD index, if it can't it will try to find an entry for each LOD levle below InOutDesiredLODIndex

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