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wires from workplane

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This commit is contained in:
Joachim Schoeberl 2021-08-13 22:39:20 +02:00
parent 082c4742d1
commit 8823101c77
1 changed files with 60 additions and 10 deletions
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70
libsrc/occ/python_occ_shapes.cpp
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@ -58,6 +58,10 @@
using namespace netgen;
class ListOfShapes : public std::vector<TopoDS_Shape> { };
void ExtractEdgeData( const TopoDS_Edge & edge, int index, std::vector<double> * p, Box<3> & box )
{
if (BRep_Tool::Degenerated(edge)) return;
@ -67,6 +71,30 @@ void ExtractEdgeData( const TopoDS_Edge & edge, int index, std::vector<double> *
TopLoc_Location loc;
BRep_Tool::PolygonOnTriangulation(edge, poly, T, loc);
if (poly.IsNull())
{
cout << "no edge mesh, do my own sampling" << endl;
double s0, s1;
Handle(Geom_Curve) c = BRep_Tool::Curve(edge, s0, s1);
for (int i = 0; i < 50; i++)
{
auto p0 = occ2ng(c->Value (s0 + i*(s1-s0)/50.0));
auto p1 = occ2ng(c->Value (s0 + (i+1)*(s1-s0)/50.0));
for(auto k : Range(3))
{
p[0].push_back(p0[k]);
p[1].push_back(p1[k]);
}
p[0].push_back(index);
p[1].push_back(index);
box.Add(p0);
box.Add(p1);
}
return;
}
int nbnodes = poly -> NbNodes();
for (int j = 1; j < nbnodes; j++)
{
@ -91,6 +119,12 @@ void ExtractFaceData( const TopoDS_Face & face, int index, std::vector<double> *
bool flip = TopAbs_REVERSED == face.Orientation();
if (triangulation.IsNull())
{
cout << "pls build face triangulation before" << endl;
return;
}
int ntriangles = triangulation -> NbTriangles();
for (int j = 1; j <= ntriangles; j++)
{
@ -374,14 +408,18 @@ public:
TopoDS_Face Face()
{
// crashes ????
BRepBuilderAPI_MakeFace builder(surf, 1e-8);
for (auto w : wires)
builder.Add(w);
return builder.Face();
// only one wire, for now:
// return BRepBuilderAPI_MakeFace(wires.back()).Face();
}
auto Wires()
{
ListOfShapes ws;
for (auto w : wires)
ws.push_back(w);
return ws;
}
};
@ -400,7 +438,6 @@ DLL_HEADER void ExportNgOCCShapes(py::module &m)
;
class ListOfShapes : public std::vector<TopoDS_Shape> { };
py::class_<TopoDS_Shape> (m, "TopoDS_Shape")
@ -536,14 +573,26 @@ DLL_HEADER void ExportNgOCCShapes(py::module &m)
.def("__add__", [] (const TopoDS_Shape & shape1, const TopoDS_Shape & shape2) {
auto fused = BRepAlgoAPI_Fuse(shape1, shape2).Shape();
return fused;
// return fused;
// make one face when fusing in 2D
// from https://gitlab.onelab.info/gmsh/gmsh/-/issues/627
// ShapeUpgrade_UnifySameDomain unify(fused, true, true, true);
// unify.Build();
// return unify.Shape();
int cntsolid = 0;
for (TopExp_Explorer e(shape1, TopAbs_SOLID); e.More(); e.Next())
cntsolid++;
for (TopExp_Explorer e(shape2, TopAbs_SOLID); e.More(); e.Next())
cntsolid++;
if (cntsolid == 0)
{
ShapeUpgrade_UnifySameDomain unify(fused, true, true, true);
unify.Build();
return unify.Shape();
}
else
return fused;
})
.def("__radd__", [] (const TopoDS_Shape & shape, int i) // for sum([shapes])
{ return shape; })
.def("__mul__", [] (const TopoDS_Shape & shape1, const TopoDS_Shape & shape2) {
// return BRepAlgoAPI_Common(shape1, shape2).Shape();
@ -1299,6 +1348,7 @@ DLL_HEADER void ExportNgOCCShapes(py::module &m)
.def("Close", &WorkPlane::Close)
.def("Last", &WorkPlane::Last)
.def("Face", &WorkPlane::Face)
.def("Wires", &WorkPlane::Wires)
;