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  3. FMeshRegionGraph

FMeshRegionGraph

[FMeshRegionGraph](API\Plugins\DynamicMesh\Parameterization\FMeshRegionGraph) represents neighbourhood relationships between mesh patches.

API > API/Plugins > API/Plugins/DynamicMesh > API/Plugins/DynamicMesh/Parameterization

References

   
Module DynamicMesh
Header /Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Parameterization/MeshRegionGraph.h
Include #include "Parameterization/MeshRegionGraph.h"

Syntax

class FMeshRegionGraph

Remarks

FMeshRegionGraph represents neighbourhood relationships between mesh patches. This is similar in some ways to a FGroupTopology, however only patch-adjacency connections are tracked. Connectivity between patches can be queried, and patches can be merged without rebuilding the graph.

Each mesh Patch/Region is assigned an integer ID/RegionIndex. After removing or merging regions, some RegionIndex values may be invalid, use IsRegion() to check

An integer ID can be associated with each Region using the ExternalIDFunc passed to the various Build() functions.

Variables

  Type Name Description
Public variable TArray< int32 > EmptyTriSet  
Public variable TArray< FRegion > Regions  
Public variable TArray< FIndex3i > TriangleNbrTris  
Public variable TArray< int32 > TriangleToRegionMap  

Functions

  Type Name Description
Public function Const bool

AreRegionsConnected ( int32 RegionAIndex,
int32 RegionBIndex
)

  
Public function Const bool

AreTrianglesConnected ( int32 TriangleA,
int32 TriangleB
)

  
Public function void

BuildFromComponents ( const FDynamicMesh3& Mesh,
const FMeshConnectedComponents& Components,
TFunctionRef< int32(int32)> ExternalIDFunc,
TFunctionRef< bool(int32, int32)> TrisConnectedPredicate
)

 Build a region graph for a Mesh using the given ConnectedComponents
Public function void

BuildFromTriangleSets ( const FDynamicMesh3& Mesh,
const TArray< TArray< int32 >>& TriangleSets,
TFunctionRef< int32(int32)> ExternalIDFunc,
TFunctionRef< bool(int32, int32)> TrisConnectedPredicate
)

 Build a region graph for a Mesh using the given triangle sets
Protected function void

BuildNeigbours ( int32 RegionIdx
)

  
Public function Const int32

GetExternalID ( int32 RegionIdx
)

  
Public function Const TArray< int32 >

GetNeighbours ( int32 RegionIdx
)

  
Public function Const int32

GetRegionTriCount ( int32 RegionIdx
)

  
Public function Const const TArray< int32 > &

GetRegionTris ( int32 RegionIdx
)

  
Public function Const int32

IsRegion ( int32 RegionIdx
)

  
Public function Const int32  
Public function bool

MergeRegion ( int32 RemoveRgnIdx,
int32 MergeToRgnIdx
)

 Merge one existing Region into another
Public function bool

MergeSmallRegions ( int32 SmallThreshold,
TFunctionRef< float(int32 SmallRgnIdx, int32 NbrRgnIdx)> RegionSimilarityFunc
)

 Incrementally merge regions with a triangle count below the given SmallThreshold.
Protected function bool

MergeSmallRegionsPass ( int32 SmallThreshold,
TFunctionRef< float(int32 SmallRgnIdx, int32 NbrRgnIdx)> RegionSimilarityFunc
)

  
Public function TArray< int32 > &&

MoveRegionTris ( int32 RegionIdx
)

 This method leaves the FMeshRegionGraph in an invalid state, and should only be used as a means to avoid memory copies while extracting the triangle sets from a FMeshRegionGraph that will then be discarded
Public function bool

OptimizeBorders ( int32 MaxRounds
)

 Optimize region borders by swapping triangles.

Classes

  Type Name Description
Public struct FNeighbour    
Public struct FRegion    

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