MergeCoincidentMeshEdges.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
// Port of geometry3Sharp MergeCoincidentEdges
 
#pragma once
 
#include "Math/UnrealMathSSE.h"
#include "MathUtil.h"
#include "VectorTypes.h"
#include "SplitAttributeWelder.h"
 
namespace UE
{
namespace Geometry
{
 
class FDynamicMesh3;
 
class FMergeCoincidentMeshEdges
{
public:
    static GEOMETRYCORE_API const double DEFAULT_TOLERANCE;  // = FMathf::ZeroTolerance;
 
    FDynamicMesh3* Mesh;
 
    double MergeVertexTolerance = DEFAULT_TOLERANCE;
 
    bool OnlyUniquePairs = false;
 
    double MergeSearchTolerance = 0;
 
 
    int32 InitialNumBoundaryEdges = 0;
    int32 FinalNumBoundaryEdges = 0;
 
    bool bWeldAttrsOnMergedEdges = false;
 
    FSplitAttributeWelder  SplitAttributeWelder;
    
    TSet<int32>* EdgesToMerge = nullptr;
 
public:
    FMergeCoincidentMeshEdges(FDynamicMesh3* mesh) : Mesh(mesh)
    {
    }
 
    GEOMETRYCORE_API virtual bool Apply();
 
 
protected:
    double MergeVtxDistSqr;     // cached value
 
    // returns true if endpoint vertices are within tolerance. Note that we do not know the order of
    // the vertices here so we try both combinations.
    inline bool IsSameEdge(const FVector3d& a, const FVector3d& b, const FVector3d& c, const FVector3d& d) const
    {
        return (DistanceSquared(a,c) < MergeVtxDistSqr && DistanceSquared(b,d) < MergeVtxDistSqr) ||
            (DistanceSquared(a,d) < MergeVtxDistSqr && DistanceSquared(b,c) < MergeVtxDistSqr);
    }
};
 
 
} // end namespace UE::Geometry
} // end namespace UE