mirror of
https://github.com/NGSolve/netgen.git
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211 lines
9.0 KiB
C++
211 lines
9.0 KiB
C++
#ifdef NG_PYTHON
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#ifdef OCCGEOMETRY
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#include <../general/ngpython.hpp>
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#include <core/python_ngcore.hpp>
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#include "../meshing/python_mesh.hpp"
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#include <meshing.hpp>
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#include <occgeom.hpp>
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#include <Standard_Version.hxx>
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using namespace netgen;
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namespace netgen
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{
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extern std::shared_ptr<NetgenGeometry> ng_geometry;
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}
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static string occparameter_description = R"delimiter(
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OCC Specific Meshing Parameters
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-------------------------------
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closeedgefac: Optional[float] = 2.
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Factor for meshing close edges, if None it is disabled.
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minedgelen: Optional[float] = 0.001
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Minimum edge length to be used for dividing edges to mesh points. If
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None this is disabled.
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)delimiter";
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void CreateOCCParametersFromKwargs(OCCParameters& occparam, py::dict kwargs)
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{
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if(kwargs.contains("minedgelen"))
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{
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auto val = kwargs.attr("pop")("minedgelen");
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if(val.is_none())
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occparam.resthminedgelenenable = false;
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else
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{
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occparam.resthminedgelen = py::cast<double>(val);
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occparam.resthminedgelenenable = true;
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}
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}
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}
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DLL_HEADER void ExportNgOCC(py::module &m)
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{
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m.attr("occ_version") = OCC_VERSION_COMPLETE;
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py::class_<OCCGeometry, shared_ptr<OCCGeometry>, NetgenGeometry> (m, "OCCGeometry", R"raw_string(Use LoadOCCGeometry to load the geometry from a *.step file.)raw_string")
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.def(py::init<>())
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.def(py::init<const TopoDS_Shape&>(), py::arg("shape"),
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"Create Netgen OCCGeometry from existing TopoDS_Shape")
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.def(py::init([] (const string& filename)
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{
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shared_ptr<OCCGeometry> geo;
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if(EndsWith(filename, ".step") || EndsWith(filename, ".stp"))
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geo.reset(LoadOCC_STEP(filename.c_str()));
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else if(EndsWith(filename, ".brep"))
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geo.reset(LoadOCC_BREP(filename.c_str()));
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else if(EndsWith(filename, ".iges"))
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geo.reset(LoadOCC_IGES(filename.c_str()));
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else
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throw Exception("Cannot load file " + filename + "\nValid formats are: step, stp, brep, iges");
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ng_geometry = geo;
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return geo;
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}), py::arg("filename"),
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"Load OCC geometry from step, brep or iges file")
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.def(NGSPickle<OCCGeometry>())
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.def("Glue", &OCCGeometry::GlueGeometry)
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.def("Heal",[](OCCGeometry & self, double tolerance, bool fixsmalledges, bool fixspotstripfaces, bool sewfaces, bool makesolids, bool splitpartitions)
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{
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self.tolerance = tolerance;
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self.fixsmalledges = fixsmalledges;
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self.fixspotstripfaces = fixspotstripfaces;
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self.sewfaces = sewfaces;
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self.makesolids = makesolids;
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self.splitpartitions = splitpartitions;
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self.HealGeometry();
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self.BuildFMap();
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},py::arg("tolerance")=1e-3, py::arg("fixsmalledges")=true, py::arg("fixspotstripfaces")=true, py::arg("sewfaces")=true, py::arg("makesolids")=true, py::arg("splitpartitions")=false,R"raw_string(Heal the OCCGeometry.)raw_string",py::call_guard<py::gil_scoped_release>())
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.def("SetFaceMeshsize", [](OCCGeometry& self, size_t fnr, double meshsize)
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{
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self.SetFaceMaxH(fnr, meshsize);
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}, "Set maximum meshsize for face fnr. Face numbers are 0 based.")
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.def("_visualizationData", [] (shared_ptr<OCCGeometry> occ_geo)
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{
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std::vector<float> vertices;
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std::vector<int> trigs;
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std::vector<float> normals;
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std::vector<float> min = {std::numeric_limits<float>::max(),
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std::numeric_limits<float>::max(),
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std::numeric_limits<float>::max()};
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std::vector<float> max = {std::numeric_limits<float>::lowest(),
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std::numeric_limits<float>::lowest(),
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std::numeric_limits<float>::lowest()};
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std::vector<string> surfnames;
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auto box = occ_geo->GetBoundingBox();
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for(int i = 0; i < 3; i++)
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{
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min[i] = box.PMin()[i];
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max[i] = box.PMax()[i];
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}
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occ_geo->BuildVisualizationMesh(0.01);
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gp_Pnt2d uv;
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gp_Pnt pnt;
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gp_Vec n;
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gp_Pnt p[3];
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int count = 0;
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for (int i = 1; i <= occ_geo->fmap.Extent(); i++)
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{
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surfnames.push_back("occ_surface" + to_string(i));
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auto face = TopoDS::Face(occ_geo->fmap(i));
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auto surf = BRep_Tool::Surface(face);
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TopLoc_Location loc;
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BRepAdaptor_Surface sf(face, Standard_False);
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BRepLProp_SLProps prop(sf, 1, 1e-5);
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Handle(Poly_Triangulation) triangulation = BRep_Tool::Triangulation (face, loc);
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if (triangulation.IsNull())
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cout << "cannot visualize face " << i << endl;
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trigs.reserve(trigs.size() + triangulation->NbTriangles()*4);
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vertices.reserve(vertices.size() + triangulation->NbTriangles()*3*3);
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normals.reserve(normals.size() + triangulation->NbTriangles()*3*3);
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for (int j = 1; j < triangulation->NbTriangles()+1; j++)
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{
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auto triangle = (triangulation->Triangles())(j);
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for (int k = 1; k < 4; k++)
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p[k-1] = (triangulation->Nodes())(triangle(k)).Transformed(loc);
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for (int k = 1; k < 4; k++)
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{
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vertices.insert(vertices.end(),{float(p[k-1].X()), float(p[k-1].Y()), float(p[k-1].Z())});
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trigs.insert(trigs.end(),{count, count+1, count+2,i});
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count += 3;
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uv = (triangulation->UVNodes())(triangle(k));
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prop.SetParameters(uv.X(), uv.Y());
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if (prop.IsNormalDefined())
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n = prop.Normal();
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else
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{
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gp_Vec a(p[0], p[1]);
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gp_Vec b(p[0], p[2]);
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n = b^a;
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}
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if (face.Orientation() == TopAbs_REVERSED) n*= -1;
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normals.insert(normals.end(),{float(n.X()), float(n.Y()), float(n.Z())});
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}
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}
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}
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py::gil_scoped_acquire ac;
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py::dict res;
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py::list snames;
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for(auto name : surfnames)
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snames.append(py::cast(name));
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res["vertices"] = MoveToNumpy(vertices);
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res["triangles"] = MoveToNumpy(trigs);
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res["normals"] = MoveToNumpy(normals);
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res["surfnames"] = snames;
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res["min"] = MoveToNumpy(min);
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res["max"] = MoveToNumpy(max);
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return res;
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}, py::call_guard<py::gil_scoped_release>())
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.def("GenerateMesh", [](shared_ptr<OCCGeometry> geo,
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MeshingParameters* pars, py::kwargs kwargs)
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{
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MeshingParameters mp;
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OCCParameters occparam;
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{
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py::gil_scoped_acquire aq;
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if(pars)
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{
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auto mp_kwargs = CreateDictFromFlags(pars->geometrySpecificParameters);
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CreateOCCParametersFromKwargs(occparam, mp_kwargs);
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mp = *pars;
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}
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CreateOCCParametersFromKwargs(occparam, kwargs);
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CreateMPfromKwargs(mp, kwargs);
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}
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geo->SetOCCParameters(occparam);
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auto mesh = make_shared<Mesh>();
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mesh->SetGeometry(geo);
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auto result = geo->GenerateMesh(mesh, mp);
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if(result != 0)
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throw Exception("Meshing failed!");
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SetGlobalMesh(mesh);
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ng_geometry = geo;
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return mesh;
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}, py::arg("mp") = nullptr,
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py::call_guard<py::gil_scoped_release>(),
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(meshingparameter_description + occparameter_description).c_str())
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;
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m.def("LoadOCCGeometry",[] (const string & filename)
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{
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cout << "WARNING: LoadOCCGeometry is deprecated! Just use the OCCGeometry(filename) constructor. It is able to read brep and iges files as well!" << endl;
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ifstream ist(filename);
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OCCGeometry * instance = new OCCGeometry();
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instance = LoadOCC_STEP(filename.c_str());
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ng_geometry = shared_ptr<OCCGeometry>(instance, NOOP_Deleter);
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return ng_geometry;
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},py::call_guard<py::gil_scoped_release>());
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}
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PYBIND11_MODULE(libNgOCC, m) {
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ExportNgOCC(m);
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}
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#endif // OCCGEOMETRY
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#endif // NG_PYTHON
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