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FMeshBoundaryLoops

API > API/Runtime > API/Runtime/GeometryCore

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

Syntax

class FMeshBoundaryLoops

Constructors

Name Remarks Include Path Unreal Specifiers
  MeshBoundaryLoops.h  

FMeshBoundaryLoops ( const FDynamicMesh3* MeshIn,
bool bAutoCompute
)

   MeshBoundaryLoops.h  

Structs

Name Remarks
Subloops  

Enums

Public

Name Remarks
EFailureBehaviors  
ESpanBehaviors  

Variables

Public

Name Type Remarks Include Path Unreal Specifiers
bAborted bool If true, we aborted computation due to unrecoverable errors MeshBoundaryLoops.h  
bFellBackToSpansOnFailure bool If true, we had to call back to spans because of failures during Compute(). MeshBoundaryLoops.h  
bOnlyComputeSpans bool After finding spans of connected edges, don't convert them to loops just leave them all as spans MeshBoundaryLoops.h  
bSawOpenSpans bool If true, we found at least one open span during Compute(). MeshBoundaryLoops.h  
EdgeFilterFunc TFunction< bool(int)> If non-null, then only edges that pass this filter are considered. This may result in open spans. MeshBoundaryLoops.h  
FailureBehavior EFailureBehaviors What Compute() will do if it encounters unrecoverable errors while walking around a loop MeshBoundaryLoops.h  
FailureBowties TArray< int > If we encountered unrecoverable errors, it is generally due to bowtie vertices. MeshBoundaryLoops.h  
Loops TArray< FEdgeLoop > Resulting set of loops filled by Compute() MeshBoundaryLoops.h  
Mesh const FDynamicMesh3 * Mesh we are finding loops on MeshBoundaryLoops.h  
SpanBehavior ESpanBehaviors What Compute() will do if it encounter open spans MeshBoundaryLoops.h  
Spans TArray< FEdgeSpan > Resulting set of spans filled by Compute(), if SpanBehavior == Compute MeshBoundaryLoops.h  

Functions

Public

Name Remarks Include Path Unreal Specifiers

bool Compute ()

 Find the set of boundary EdgeLoops and EdgeSpans. MeshBoundaryLoops.h  

int FindLoopContainingEdge ( int EdgeID
) const

   MeshBoundaryLoops.h  

int FindLoopContainingVertex ( int VertexID
) const

   MeshBoundaryLoops.h  

int FindLoopEdgesHint ( const TSet< int >& BorderHintEdges
) const

   MeshBoundaryLoops.h  

int FindLoopTrianglesHint ( const TArray< int >& BorderHintTris
) const

   MeshBoundaryLoops.h  

int FindSpanContainingEdge ( int EdgeID
) const

   MeshBoundaryLoops.h  

FIndex2i FindVertexInLoop ( int VertexID
) const

   MeshBoundaryLoops.h  

int GetLongestLoopIndex()

   MeshBoundaryLoops.h  

int GetLoopCount()

   MeshBoundaryLoops.h  

int GetMaxVerticesLoopIndex()

   MeshBoundaryLoops.h  

int GetSpanCount()

   MeshBoundaryLoops.h  

void SetMesh ( const FDynamicMesh3* MeshIn
)

   MeshBoundaryLoops.h  

Protected

Name Remarks Include Path Unreal Specifiers

bool ExtractSubloops ( TArray< int >& loopV,
TArray< int >& loopE,
TArray< int >& bowties,
Subloops& SubloopsOut
)

 This is called when loopV contains one or more "bowtie" vertices. MeshBoundaryLoops.h  

int FindLeftTurnEdge ( int incoming_e,
int bowtie_v,
TArray< int >& bdry_edges,
int bdry_edges_count,
TArray< bool >& used_edges
)

 Ok, bdry_edges[0...bdry_edges_count] contains the boundary edges coming out of bowtie_v. MeshBoundaryLoops.h  

FVector3d GetVertexNormal ( int vid
)

 [TODO] cache this : a dictionary? we will not need very many, but we will need each multiple times! MeshBoundaryLoops.h  

Static

Name Remarks Include Path Unreal Specifiers

static int CountInList ( const TArray< int >& Loop,
int Item
)

 Count number of times item appears in loop MeshBoundaryLoops.h  

static int CountSpan ( const TArray< int >& Loop,
int i0,
int i1
)

 Count number of valid vertices in l between loop[i0] and loop[i1-1] MeshBoundaryLoops.h  

static void ExtractSpan ( TArray< int >& Loop,
int i0,
int i1,
bool bMarkInvalid,
TArray< int >& OutSpan
)

 Read out the span from loop[i0] to loop [i1-1] into an array. MeshBoundaryLoops.h  

static int FindIndex ( const TArray< int >& Loop,
int Start,
int Item
)

 Find the index of item in loop, starting at start index MeshBoundaryLoops.h  

static bool IsSimpleBowtieLoop ( const TArray< int >& LoopVerts,
const TArray< int >& BowtieVerts,
int BowtieVertex,
int& start_i,
int& end_i
)

 Static Utility functions that can be re-used in MeshRegionBoundaryLoops In all the functions below, the list loopV is assumed to possibly contain "removed" vertices indicated by -1. MeshBoundaryLoops.h  

static bool IsSimplePath ( const TArray< int >& LoopVerts,
const TArray< int >& BowtieVerts,
int BowtieVertex,
int i1,
int i2
)

 Check if forward path from loopV[i1] to loopV[i2] contains any bowtie verts other than bowtieV MeshBoundaryLoops.h  

Operators

Name Remarks Include Path Unreal Specifiers

const FEdgeLoop & operator[] ( int Index
) const

   MeshBoundaryLoops.h  

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