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https://github.com/NGSolve/netgen.git
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236 lines
8.4 KiB
C++
236 lines
8.4 KiB
C++
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#ifdef NG_PYTHON
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#include <../general/ngpython.hpp>
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#include <core/python_ngcore.hpp>
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#include <stlgeom.hpp>
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#include "../meshing/python_mesh.hpp"
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using namespace netgen;
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namespace netgen
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{
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extern shared_ptr<Mesh> mesh;
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extern shared_ptr<NetgenGeometry> ng_geometry;
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}
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static string stlparameter_description = R"delimiter(
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STL Specific Meshing Parameters
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-------------------------------
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yangle: float = 30.
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Angle for edge detection
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contyangle: float = 20.
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Edges continue if angle > contyangle
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edgecornerangle: float = 60.
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Angle of geometry edge at which the mesher should set a point.
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closeedgefac: Optional[float] = 1.
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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 CreateSTLParametersFromKwargs(STLParameters& stlparam, py::dict kwargs)
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{
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if(kwargs.contains("yangle"))
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stlparam.yangle = py::cast<double>(kwargs.attr("pop")("yangle"));
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if(kwargs.contains("contyangle"))
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stlparam.contyangle = py::cast<double>(kwargs.attr("pop")("contyangle"));
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if(kwargs.contains("edgecornerangle"))
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stlparam.edgecornerangle = py::cast<double>(kwargs.attr("pop")("edgecornerangle"));
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if(kwargs.contains("chartangle"))
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stlparam.chartangle = py::cast<double>(kwargs.attr("pop")("chartangle"));
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if(kwargs.contains("outerchartangle"))
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stlparam.outerchartangle = py::cast<double>(kwargs.attr("pop")("outerchartangle"));
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if(kwargs.contains("usesearchtree"))
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stlparam.usesearchtree = py::cast<int>(kwargs.attr("pop")("usesearchtree"));
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if(kwargs.contains("atlasfac"))
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{
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auto val = kwargs.attr("pop")("resthatlasfac");
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if(val.is_none())
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stlparam.resthatlasenable = false;
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else
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{
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stlparam.resthatlasenable = true;
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stlparam.resthatlasfac = py::cast<double>(val);
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}
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}
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if(kwargs.contains("atlasminh"))
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stlparam.atlasminh = py::cast<double>(kwargs.attr("pop")("atlasminh"));
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if(kwargs.contains("surfcurvfac"))
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{
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auto val = kwargs.attr("pop")("surfcurvfac");
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if(val.is_none())
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stlparam.resthsurfcurvenable = false;
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else
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{
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stlparam.resthsurfcurvenable = true;
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stlparam.resthsurfcurvfac = py::cast<double>(val);
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}
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}
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if(kwargs.contains("chartdistfac"))
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{
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auto val = kwargs.attr("pop")("chartdistfac");
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if(val.is_none())
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stlparam.resthchartdistenable = false;
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else
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{
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stlparam.resthchartdistenable = true;
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stlparam.resthchartdistfac = py::cast<double>(val);
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}
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}
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if(kwargs.contains("edgeanglefac"))
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{
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auto val = kwargs.attr("pop")("edgeanglefac");
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if(val.is_none())
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stlparam.resthedgeangleenable = false;
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else
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{
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stlparam.resthedgeangleenable = true;
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stlparam.resthedgeanglefac = py::cast<double>(val);
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}
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}
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if(kwargs.contains("surfmeshcurvfac"))
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{
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auto val = kwargs.attr("pop")("surfmeshcurvfac");
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if(val.is_none())
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stlparam.resthsurfmeshcurvenable = false;
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else
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{
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stlparam.resthsurfmeshcurvenable = true;
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stlparam.resthsurfmeshcurvfac = py::cast<double>(val);
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}
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}
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if(kwargs.contains("linelengthfac"))
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{
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auto val = kwargs.attr("pop")("linelengthfac");
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if(val.is_none())
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stlparam.resthlinelengthenable = false;
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else
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{
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stlparam.resthlinelengthenable = true;
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stlparam.resthlinelengthfac = py::cast<double>(val);
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}
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}
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if(kwargs.contains("recalc_h_opt"))
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stlparam.recalc_h_opt = py::cast<bool>(kwargs.attr("pop")("recalc_h_opt"));
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}
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NGCORE_API_EXPORT void ExportSTL(py::module & m)
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{
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py::class_<STLGeometry,shared_ptr<STLGeometry>, NetgenGeometry> (m,"STLGeometry")
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.def(py::init<>())
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.def(py::init<>([](const string& filename, bool surface)
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{
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ifstream ist(filename);
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return shared_ptr<STLGeometry>(STLGeometry::Load(ist,
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surface));
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}), py::arg("filename"), py::arg("surface")=false,
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py::call_guard<py::gil_scoped_release>())
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.def(NGSPickle<STLGeometry>())
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.def("_visualizationData", [](shared_ptr<STLGeometry> stl_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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surfnames.push_back("stl");
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vertices.reserve(stl_geo->GetNT()*3*3);
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trigs.reserve(stl_geo->GetNT()*4);
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normals.reserve(stl_geo->GetNT()*3*3);
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size_t ii = 0;
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for(int i = 0; i < stl_geo->GetNT(); i++)
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{
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auto& trig = stl_geo->GetTriangle(i+1);
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for(int k = 0; k < 3; k++)
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{
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trigs.push_back(ii++);
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auto& pnt = stl_geo->GetPoint(trig[k]);
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for (int l = 0; l < 3; l++)
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{
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float val = pnt[l];
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vertices.push_back(val);
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min[l] = min2(min[l], val);
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max[l] = max2(max[l], val);
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normals.push_back(trig.Normal()[l]);
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}
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}
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trigs.push_back(0);
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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<STLGeometry> geo,
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MeshingParameters* pars, py::kwargs kwargs)
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{
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MeshingParameters mp;
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STLParameters stlparam;
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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_flags = pars->geometrySpecificParameters;
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auto mp_kwargs = CreateDictFromFlags(mp_flags);
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CreateSTLParametersFromKwargs(stlparam, mp_kwargs);
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mp = *pars;
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}
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CreateSTLParametersFromKwargs(stlparam, kwargs);
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CreateMPfromKwargs(mp, kwargs); // this will throw if any kwargs are not passed
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}
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auto mesh = make_shared<Mesh>();
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mesh->SetGeometry(geo);
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ng_geometry = geo;
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SetGlobalMesh(mesh);
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auto result = STLMeshingDummy(geo.get(), mesh, mp, stlparam);
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if(result != 0)
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{
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netgen::mesh = mesh;
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throw Exception("Meshing failed!");
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}
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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 + stlparameter_description).c_str())
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.def("Draw", FunctionPointer
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([] (shared_ptr<STLGeometry> self)
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{
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ng_geometry = self;
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})
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)
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;
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m.def("LoadSTLGeometry", [] (const string & filename)
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{
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cout << "WARNING: LoadSTLGeometry is deprecated, use the STLGeometry(filename) constructor instead!" << endl;
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ifstream ist(filename);
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return shared_ptr<STLGeometry>(STLGeometry::Load(ist));
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},py::call_guard<py::gil_scoped_release>());
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}
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PYBIND11_MODULE(libstl, m) {
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ExportSTL(m);
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}
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#endif
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