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> Unreal Engine API Reference > Plugins > DynamicMesh > Operations > FMeshRegionOperator

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FMeshRegionOperator

This class automatically extracts a submesh from a mesh, and can re-insert it after you have edited it, as long as you have not messed up the boundary

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References

Module	DynamicMesh
Header	/Engine/Plugins/Experimental/GeometryProcessing/Source/DynamicMesh/Public/Operations/MeshRegionOperator.h
Include	#include "Operations/MeshRegionOperator.h"

Syntax

class FMeshRegionOperator

Remarks

This class automatically extracts a submesh from a mesh, and can re-insert it after you have edited it, as long as you have not messed up the boundary

[TODO] Should this share any code w/ RegionRemesher? [TODO] ReinsertSubToBaseMapT is not returned by the FDynamicMeshEditor.ReinsertSubmesh, instead we are trying to guess it here, by making some assumptions about what happens. It works for now, but it would better if FDynamicMeshEditor returned this information.

Variables

	Name	Description
FDynamicMesh3 &...	BaseMesh
TArray< int >	CurrentBaseTris	IDs of triangles in the base mesh that correspond to the submesh at time of last Compute or BackPropagate.
FDynamicSubmesh...	Region
FDynamicMeshEdi...	ReinsertDuplicateTriBehavior	Handle a tricky problem...see comments for EDuplicateTriBehavior enum
FOptionallySpar...	ReinsertSubToBaseMapT	[RMS] computation of this is kind of a hack right now...
FOptionallySpar...	ReinsertSubToBaseMapV	This is only valid after BackPropagate() call!! maps submeshverts to base mesh

Constructors

	Name	Description
	FMeshRegionOperator ( FDynamicMesh3* Base, const TArrayView< const int >& Reg... )
	FMeshRegionOperator ( FDynamicMesh3* Base, const TArrayView< const int >& Reg..., TFunctionRef< void... )

Functions

	Name	Description
bool	BackPropropagate ( bool bAllowSubmeshRepairs )	Remove the original submesh region and merge in the remeshed version.
bool	BackPropropagateVertices ( bool bRecomputeBoundaryNormals )	Transfer vertex positions in submesh back to base mesh; for use when the vertices in submesh still directly correspond back
TSet< int >	CurrentBaseInteriorVertices()
const TArray...	CurrentBaseTriangles()
void	RepairPossibleNonManifoldEdges()	After remeshing we may create an internal edge between two boundary vertices [a,b].
void	SetSubmeshGroupID ( int GID )

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