FMeshRegionBoundaryLoops | Unreal Engine 5.6 Documentation

Extract FEdgeLoops on the boundary of a set of triangles of a mesh.


Name	FMeshRegionBoundaryLoops
Type	class
Header File	/Engine/Source/Runtime/GeometryCore/Public/MeshRegionBoundaryLoops.h
Include Path	#include "MeshRegionBoundaryLoops.h"

Syntax

class FMeshRegionBoundaryLoops

Name	Remarks	Include Path	Unreal Specifiers
FMeshRegionBoundaryLoops ( const FDynamicMesh3* MeshIn, const TArray< int >& RegionTris, bool bAutoCompute )		MeshRegionBoundaryLoops.h
FMeshRegionBoundaryLoops ()		MeshRegionBoundaryLoops.h

Name	Type	Remarks	Include Path
ElementIDAndValue	TPair< int32, ElementType >		MeshRegionBoundaryLoops.h
VidOverlayMap	TMap< int32, ElementIDAndValue< ElementType > >		MeshRegionBoundaryLoops.h

Name	Type	Remarks	Include Path
bFailed	bool	If true, we did not completely succeed in extracting all loops	MeshRegionBoundaryLoops.h
Loops	TArray< FEdgeLoop >	Resulting set of loops filled by Compute()	MeshRegionBoundaryLoops.h
Mesh	const FDynamicMesh3 *	Mesh we are finding loops on	MeshRegionBoundaryLoops.h

Name	Remarks	Include Path
bool Compute()	Find set of FEdgeLoops on the border of the input triangle set	MeshRegionBoundaryLoops.h
int32 GetLoopCount()		MeshRegionBoundaryLoops.h
bool GetLoopOverlayMap ( const FEdgeLoop& LoopIn, const TDynamicMeshOverlay< StorageType, ElementSize >& Overlay, VidOverlayMap< ElementType >& LoopVidsToOverlayElementsOut )	Generates a map from vertex ID's of the loop vertices to corresponding overlay element ID's and values.	MeshRegionBoundaryLoops.h
const TArray< FEdgeLoop > & GetLoops()		MeshRegionBoundaryLoops.h
int GetMaxVerticesLoopIndex()		MeshRegionBoundaryLoops.h
int32 Num()		MeshRegionBoundaryLoops.h
void SetMesh ( const FDynamicMesh3* MeshIn, const TArray< int >& RegionTris )		MeshRegionBoundaryLoops.h
void UpdateLoopOverlayMapValidity ( VidOverlayMap< ElementType >& LoopVidsToOverlayElements, const TDynamicMeshOverlay< StorageType, ElementSize >& Overlay )	Given a map generated by GetLoopOverlayMap(), checks that the overlay elements pointed to by the map still exist in the overlay, and sets the ID to be invalid if not.	MeshRegionBoundaryLoops.h

Name	Remarks	Include Path
int FindLeftTurnEdge ( int incoming_e, int bowtie_v, TArray< int >& bdry_edges, int bdry_edges_count, const FIndexFlagSet& used_edges )	Ok, bdry_edges[0...bdry_edges_count] contains the boundary edges coming out of bowtie_v.	MeshRegionBoundaryLoops.h
int GetAllVertexBoundaryEdges ( int vID, TArray< int >& e )	E needs to be large enough (ie call GetVtxBoundaryEdges, or as large as max one-ring) returns count, ie number of elements of e that were filled	MeshRegionBoundaryLoops.h
FIndex2i GetOrientedEdgeVerts ( int eID, int tid_in )	Return same indices as GetEdgeV, but oriented based on attached triangle	MeshRegionBoundaryLoops.h
int GetVertexBoundaryEdges ( int vID, int& e0, int& e1 )	Returns first two boundary edges, and count of total boundary edges	MeshRegionBoundaryLoops.h
FVector3d GetVertexNormal ( int vid )	[TODO] cache this : a dictionary? we will not need very many, but we will need each multiple times!	MeshRegionBoundaryLoops.h
bool IsEdgeOnBoundary ( int eid ) const		MeshRegionBoundaryLoops.h
bool IsEdgeOnBoundary ( int eid, int& tid_in, int& tid_out ) const	Returns true for both internal and mesh boundary edges tid_in and tid_out are triangles 'in' and 'out' of set, respectively	MeshRegionBoundaryLoops.h
bool TryExtractSubloops ( TArray< int >& loopV, const TArray< int >& loopE, const TArray< int >& bowties, TArray< FEdgeLoop >& SubLoopsOut )	This is called when loopV contains one or more "bowtie" vertices.	MeshRegionBoundaryLoops.h

Name	Remarks	Include Path	Unreal Specifiers
static bool GetTriangleSetBoundaryLoop ( const FDynamicMesh3& Mesh, const TArray< int32 >& Tris, FEdgeLoop& Loop )	Find the edge loop border around a set of triangles of a Mesh.	MeshRegionBoundaryLoops.h

Name	Remarks	Include Path	Unreal Specifiers
const FEdgeLoop & operator[] ( int Index ) const		MeshRegionBoundaryLoops.h