FMeshMergeDataTracker

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

Unreal Engine C++ API Reference > Developer > MeshMergeUtilities

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

Type 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

Type Name Description
  FMeshMergeDataTracker ()  

Functions

Type 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
double GetTextureSizeFromTargetTexelDensity ( float InTargetTexelDensity )  
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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