You've already forked UnrealEngineUWP
mirror of
https://github.com/izzy2lost/UnrealEngineUWP.git
synced 2026-03-26 18:15:20 -07:00
e196c256e4
#rb none #rnx #jira none #preflight 60c52c5db9446100014da02d [CL 16653115 by Ryan Schmidt in ue5-main branch]
74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
|
|
|
|
#include "Operations/MeshProjectionHull.h"
|
|
#include "Solvers/MeshLinearization.h"
|
|
#include "MeshSimplification.h"
|
|
#include "DynamicMesh/MeshNormals.h"
|
|
#include "CompGeom/ConvexHull2.h"
|
|
#include "Generators/SweepGenerator.h"
|
|
|
|
#include "ExplicitUseGeometryMathTypes.h" // using UE::Geometry::(math types)
|
|
using namespace UE::Geometry;
|
|
|
|
bool FMeshProjectionHull::Compute()
|
|
{
|
|
// compute set of projected 2D vertices, and find the 1D bounding interval along the projection axis
|
|
FVector3d ProjAxis = ProjectionFrame.Z();
|
|
FInterval1d ProjInterval = FInterval1d::Empty();
|
|
TArray<FVector2d> Vertices;
|
|
Vertices.Reserve(Mesh->VertexCount());
|
|
for (int32 vid : Mesh->VertexIndicesItr())
|
|
{
|
|
FVector3d Position = Mesh->GetVertex(vid);
|
|
FVector2d ProjPos = ProjectionFrame.ToPlaneUV(Position, 2);
|
|
Vertices.Add(ProjPos);
|
|
|
|
ProjInterval.Contain( (Position-ProjectionFrame.Origin).Dot(ProjAxis) );
|
|
}
|
|
|
|
// compute the 2D convex hull
|
|
FConvexHull2d HullCompute;
|
|
bool bOK = HullCompute.Solve(Vertices);
|
|
if (!bOK)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
// extract hull polygon
|
|
ConvexHull2D = FPolygon2d(Vertices, HullCompute.GetPolygonIndices());
|
|
if (ConvexHull2D.Area() < FMathf::ZeroTolerance)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
// simplify if requested
|
|
if (bSimplifyPolygon)
|
|
{
|
|
SimplifiedHull2D = ConvexHull2D;
|
|
SimplifiedHull2D.Simplify(MinEdgeLength, DeviationTolerance);
|
|
}
|
|
|
|
// shift the projection frame to the min position along the axis
|
|
FFrame3d CenterFrame = ProjectionFrame;
|
|
CenterFrame.Origin += ProjInterval.Min * ProjAxis;
|
|
|
|
// apply min-thickness if necessary
|
|
double ExtrudeLength = ProjInterval.Length();
|
|
if (ExtrudeLength < MinThickness)
|
|
{
|
|
ExtrudeLength = MinThickness;
|
|
CenterFrame.Origin -= (ExtrudeLength * 0.5) * ProjAxis;
|
|
}
|
|
|
|
// generate the swept-polygon mesh
|
|
FGeneralizedCylinderGenerator MeshGen;
|
|
MeshGen.CrossSection = (bSimplifyPolygon) ? SimplifiedHull2D : ConvexHull2D;
|
|
MeshGen.Path.Add(CenterFrame.Origin);
|
|
CenterFrame.Origin += ExtrudeLength * ProjAxis;
|
|
MeshGen.Path.Add(CenterFrame.Origin);
|
|
MeshGen.bCapped = true;
|
|
MeshGen.Generate();
|
|
ConvexHull3D.Copy(&MeshGen);
|
|
|
|
return true;
|
|
} |