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occ-triangulation

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This commit is contained in:
Joachim Schoeberl 2021-07-30 09:43:29 +02:00
parent 62463b904e
commit b829c9bcc8
1 changed files with 48 additions and 0 deletions
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48
libsrc/occ/python_occ.cpp
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@ -77,6 +77,9 @@ void CreateOCCParametersFromKwargs(OCCParameters& occparam, py::dict kwargs)
DLL_HEADER void ExportNgOCC(py::module &m)
{
m.attr("occ_version") = OCC_VERSION_COMPLETE;
// not working, since occ - exceptions don't derive from std::exception
// py::register_exception<Standard_Failure>(m, "OCC-Exception");
py::class_<OCCGeometry, shared_ptr<OCCGeometry>, NetgenGeometry> (m, "OCCGeometry", R"raw_string(Use LoadOCCGeometry to load the geometry from a *.step file.)raw_string")
.def(py::init<>())
/*
@ -479,6 +482,51 @@ DLL_HEADER void ExportNgOCC(py::module &m)
return builder.Shape();
})
.def("Triangulation", [](const TopoDS_Shape & shape)
{
// extracted from vsocc.cpp
Array< std::array<Point<3>,3> > triangles;
TopoDS_Face face;
try
{
face = TopoDS::Face(shape);
}
catch (Standard_Failure & e)
{
e.Print (cout);
throw NgException ("Triangulation: shape is not a face");
}
BRepTools::Clean (shape);
double deflection = 0.01;
BRepMesh_IncrementalMesh (shape, deflection, true);
Handle(Geom_Surface) surf = BRep_Tool::Surface (face);
TopLoc_Location loc;
Handle(Poly_Triangulation) triangulation = BRep_Tool::Triangulation (face, loc);
if (!triangulation.IsNull())
{
int ntriangles = triangulation -> NbTriangles();
for (int j = 1; j <= ntriangles; j++)
{
cout << "triangle " << j << "/" << ntriangles << endl;
Poly_Triangle triangle = (triangulation -> Triangles())(j);
std::array<Point<3>,3> pts;
for (int k = 0; k < 3; k++)
pts[k] = occ2ng( (triangulation -> Nodes())(triangle(k+1)).Transformed(loc) );
triangles.Append ( pts );
for (auto p : pts) cout << p << " ";
cout << endl;
}
}
return triangles;
})
;