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81 lines
2.4 KiB
C++
81 lines
2.4 KiB
C++
#include <Bnd_Box.hxx>
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#include <BRepBndLib.hxx>
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#include <BRep_TVertex.hxx>
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#include <BRepMesh_IncrementalMesh.hxx>
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#include <BRepTools.hxx>
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#include "occ_utils.hpp"
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namespace netgen
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{
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Point<3> occ2ng (const TopoDS_Shape& shape)
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{
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if(shape.ShapeType() != TopAbs_VERTEX)
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throw Exception("Try to convert non vertex to point!");
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return occ2ng( BRep_Tool::Pnt(TopoDS::Vertex(shape)) );
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}
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Transformation<3> occ2ng (const gp_Trsf & occ_trafo)
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{
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Transformation<3> trafo;
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auto v = occ_trafo.TranslationPart();
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auto m = occ_trafo.VectorialPart();
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auto & tv = trafo.GetVector();
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auto & tm = trafo.GetMatrix();
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for(auto i : Range(3))
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{
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tv[i] = v.Coord(i+1);
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for(auto k : Range(3))
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tm(i,k) = m(i+1,k+1);
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}
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return trafo;
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}
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Transformation<3> occ2ng (const gp_GTrsf & occ_trafo)
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{
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Transformation<3> trafo;
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auto v = occ_trafo.TranslationPart();
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auto m = occ_trafo.VectorialPart();
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auto & tv = trafo.GetVector();
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auto & tm = trafo.GetMatrix();
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for(auto i : Range(3))
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{
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tv[i] = v.Coord(i+1);
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for(auto k : Range(3))
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tm(i,k) = m(i+1,k+1);
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}
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return trafo;
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}
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Box<3> GetBoundingBox( const TopoDS_Shape & shape )
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{
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Bnd_Box bb;
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#if OCC_VERSION_HEX < 0x070000
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BRepBndLib::Add (shape, bb);
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#else
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BRepBndLib::Add (shape, bb, true);
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#endif
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return {occ2ng(bb.CornerMin()), occ2ng(bb.CornerMax())};
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}
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Standard_Integer BuildTriangulation( const TopoDS_Shape & shape )
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{
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BRepTools::Clean (shape);
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// double deflection = 0.01;
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// https://dev.opencascade.org/doc/overview/html/occt_user_guides__mesh.html
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// from Standard_Boolean meshing_imeshtools_parameters()
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IMeshTools_Parameters aMeshParams;
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aMeshParams.Deflection = 0.01;
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aMeshParams.Angle = 0.5;
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aMeshParams.Relative = Standard_False;
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aMeshParams.InParallel = Standard_True;
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aMeshParams.MinSize = Precision::Confusion();
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aMeshParams.InternalVerticesMode = Standard_True;
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aMeshParams.ControlSurfaceDeflection = Standard_True;
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BRepMesh_IncrementalMesh aMesher (shape, aMeshParams);
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return aMesher.GetStatusFlags();
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}
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}
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