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