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  3. FMeshBoundaryLoops

FMeshBoundaryLoops

API > API/Runtime > API/Runtime/GeometryCore

References

   
Module GeometryCore
Header /Engine/Source/Runtime/GeometryCore/Public/MeshBoundaryLoops.h
Include #include "MeshBoundaryLoops.h"

Syntax

class FMeshBoundaryLoops

Variables

  Type Name Description
Public variable bool bAborted If true, we aborted computation due to unrecoverable errors
Public variable bool bFellBackToSpansOnFailure If true, we had to call back to spans because of failures during Compute().
Public variable bool bSawOpenSpans If true, we found at least one open span during Compute().
Public variable TFunction< bool(int)> EdgeFilterFunc If non-null, then only edges that pass this filter are considered. This may result in open spans.
Public variable EFailureBehaviors FailureBehavior What Compute() will do if it encounters unrecoverable errors while walking around a loop
Public variable TArray< int > FailureBowties If we encountered unrecoverable errors, it is generally due to bowtie vertices.
Public variable TArray< FEdgeLoop > Loops Resulting set of loops filled by Compute()
Public variable const FDynamicMesh3 * Mesh Mesh we are finding loops on
Public variable ESpanBehaviors SpanBehavior What Compute() will do if it encounter open spans
Public variable TArray< FEdgeSpan > Spans Resulting set of spans filled by Compute(), if SpanBehavior == Compute
Protected variable TArray< int > VerticesTemp  

Constructors

  Type Name Description
Public function    
Public function  

FMeshBoundaryLoops ( const FDynamicMesh3* MeshIn,
bool bAutoCompute
)

  

Functions

  Type Name Description
Public function bool

Compute ()

 Find the set of boundary EdgeLoops and EdgeSpans.
Protected function Static int

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

 Count number of times item appears in loop
Protected function 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]
Protected function 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.
Protected function bool

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

 This is called when loopV contains one or more "bowtie" vertices.
Protected function Static int

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

 Find the index of item in loop, starting at start index
Protected function 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.
Public function Const int

FindLoopContainingEdge ( int EdgeID
)

  
Public function Const int

FindLoopContainingVertex ( int VertexID
)

  
Public function Const int

FindLoopEdgesHint ( const TSet< int >& BorderHintEdges
)

  
Public function Const int

FindLoopTrianglesHint ( const TArray< int >& BorderHintTris
)

  
Public function Const FIndex2i

FindVertexInLoop ( int VertexID
)

  
Public function Const int  
Public function Const int  
Public function Const int  
Public function Const int  
Protected function FVector3d

GetVertexNormal ( int vid
)

 [TODO] cache this : a dictionary? we will not need very many, but we will need each multiple times!
Protected function 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.
Protected function 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
Public function void

SetMesh ( const FDynamicMesh3* MeshIn
)

  

Operators

  Type Name Description
Public function Const const FEdgeLoop &

operator[] ( int Index
)

  

Classes

  Type Name Description
Protected struct Subloops    

Enums

  Type Name Description
Public enum EFailureBehaviors    
Public enum ESpanBehaviors    

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