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  3. FPolygroupsGenerator

FPolygroupsGenerator

[FPolygroupsGenerator](API\Plugins\DynamicMesh\Polygroups\FPolygroupsGenerator) generates (face/tri/poly)groups for an input mesh based on the geometry and attributes of the input mesh.

API > API/Plugins > API/Plugins/DynamicMesh > API/Plugins/DynamicMesh/Polygroups

References

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

Syntax

class FPolygroupsGenerator

Remarks

FPolygroupsGenerator generates (face/tri/poly)groups for an input mesh based on the geometry and attributes of the input mesh. The various FindPolygroupsFromX() are the driving functions, each performs the full computation.

Variables

  Type Name Description
Public variable bool bApplyPostProcessing If true, then groups will be post-processed to optimize them, based on parmeters below
Public variable bool bCopyToMesh If true, after groups are computed they will be copied to the output mesh
Public variable TArray< TArray< int > > FoundPolygroups Lists of triangle IDs, each list defines a polygroup/polygon
Public variable int32 InitialGroupID Start at this GroupID when assigning new groups
Public variable FDynamicMesh3 * Mesh Source mesh
Public variable int32 MinGroupSize If > 1, groups with a triangle count smaller than this will be merged with a neighbouring group
Public variable TArray< int > PolygroupEdges List of edge IDs of mesh edges that are on polygroup borders

Constructors

  Type Name Description
Public function    
Public function    

Functions

  Type Name Description
Public function void Copy the computed Polygroups to the input Mesh.
Public function void Copy the computed Polygroups to the given PolygroupSet and Mesh
Public function bool Initialize the PolygroupEdges output member by finding all the mesh edges that are on polygroup borders.
Public function bool Find Polygroups based on mesh connectivity, ie each connected-component becomes a Polygroup
Public function bool

FindPolygroupsFromFaceNormals ( double DotTolerance,
bool bRespectUVSeams,
bool bRespectNormalSeams
)

 Find Polygroups by randomly picking initial seed triangles and then flood-filling outwards, stopping when the opening angle at an edge is larger than the angle defined by the DotTolerance.
Public function bool

FindPolygroupsFromFurthestPointSampling ( int32 NumPoints,
EWeightingType WeightingType,
FVector3d WeightingCoeffs,
FPolygroupSet* StartingGroups
)

 Incrementally compute approximate-geodesic-based furthest-point sampling of the mesh until NumPoints samples have been found, then compute local geodesic patches (eg approximate surface voronoi diagaram).
Public function bool Find Polygroups based on Seams in UV Overlay
Public function bool

FindPolygroupsFromUVIslands ( int32 UVLayer
)

 Find Polygroups based on UV Islands, ie each UV Island becomes a Polygroup
Public function bool

FindSourceMeshPolygonPolygroups ( bool bRespectUVSeams,
bool bRespectNormalSeams,
double QuadAdjacencyWeight,
double QuadMetricClamp,
int MaxSearchRounds
)

 Find Polygroups by trying to invert triangluation of a polygon mesh
Protected function Const void

GetSeamConstraintEdges ( bool bUVSeams,
bool bNormalSeams,
TSet< int32 >& ConstraintEdgesOut
)

  
Protected function void

OptimizePolygroups ( TFunctionRef< bool(int32, int32)> TrisConnectedPredicate
)

  
Protected function void

PostProcessPolygroups ( bool bApplyMerging,
TFunctionRef< bool(int32, int32)> TrisConnectedPredicate
)

  

Enums

  Type Name Description
Public enum EWeightingType Weight potions for algorithms below  

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