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#ROBOMERGE-AUTHOR: michael.balzer #ROBOMERGE-SOURCE: CL 18227685 in //UE5/Release-5.0/... via CL 18229350 #ROBOMERGE-BOT: STARSHIP (Release-Engine-Staging -> Release-Engine-Test) (v895-18170469) #ROBOMERGE[STARSHIP]: UE5-Main [CL 18231457 by michael balzer in ue5-release-engine-test branch]
73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#include "Operations/MeshProjectionHull.h"
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#include "Solvers/MeshLinearization.h"
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#include "MeshSimplification.h"
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#include "DynamicMesh/MeshNormals.h"
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#include "CompGeom/ConvexHull2.h"
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#include "Generators/SweepGenerator.h"
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using namespace UE::Geometry;
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bool FMeshProjectionHull::Compute()
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{
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// compute set of projected 2D vertices, and find the 1D bounding interval along the projection axis
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FVector3d ProjAxis = ProjectionFrame.Z();
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FInterval1d ProjInterval = FInterval1d::Empty();
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TArray<FVector2d> Vertices;
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Vertices.Reserve(Mesh->VertexCount());
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for (int32 vid : Mesh->VertexIndicesItr())
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{
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FVector3d Position = Mesh->GetVertex(vid);
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FVector2d ProjPos = ProjectionFrame.ToPlaneUV(Position, 2);
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Vertices.Add(ProjPos);
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ProjInterval.Contain( (Position-ProjectionFrame.Origin).Dot(ProjAxis) );
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}
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// compute the 2D convex hull
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FConvexHull2d HullCompute;
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bool bOK = HullCompute.Solve(Vertices);
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if (!bOK)
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{
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return false;
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}
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// extract hull polygon
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ConvexHull2D = FPolygon2d(Vertices, HullCompute.GetPolygonIndices());
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if (ConvexHull2D.Area() < FMathf::ZeroTolerance)
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{
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return false;
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}
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// simplify if requested
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if (bSimplifyPolygon)
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{
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SimplifiedHull2D = ConvexHull2D;
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SimplifiedHull2D.Simplify(MinEdgeLength, DeviationTolerance);
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}
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// shift the projection frame to the min position along the axis
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FFrame3d CenterFrame = ProjectionFrame;
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CenterFrame.Origin += ProjInterval.Min * ProjAxis;
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// apply min-thickness if necessary
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double ExtrudeLength = ProjInterval.Length();
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if (ExtrudeLength < MinThickness)
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{
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ExtrudeLength = MinThickness;
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CenterFrame.Origin -= (ExtrudeLength * 0.5) * ProjAxis;
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}
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// generate the swept-polygon mesh
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FGeneralizedCylinderGenerator MeshGen;
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MeshGen.CrossSection = (bSimplifyPolygon) ? SimplifiedHull2D : ConvexHull2D;
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MeshGen.Path.Add(CenterFrame.Origin);
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CenterFrame.Origin += ExtrudeLength * ProjAxis;
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MeshGen.Path.Add(CenterFrame.Origin);
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MeshGen.bCapped = true;
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MeshGen.Generate();
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ConvexHull3D.Copy(&MeshGen);
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return true;
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} |