netgen/libsrc/csg/python_csg.cpp

#ifdef NG_PYTHON

#include <../general/ngpython.hpp>
#include <csg.hpp>


using namespace netgen;

namespace netgen
{
  extern shared_ptr<NetgenGeometry> ng_geometry;
}



// a shadow solid tree using shared pointers.

class SPSolid
{
  shared_ptr<SPSolid> s1, s2;
  Solid * solid;
  int bc = -1;
  string bcname = "";
  double maxh = -1;
  string material;
  bool owner;
  double red, green, blue;
  bool transp = false;
public:
  enum optyp { TERM, SECTION, UNION, SUB };

  SPSolid (Solid * as) : solid(as), owner(true), op(TERM) { ; }
  ~SPSolid () 
  {
    ; // if (owner) delete solid;
  }  
  SPSolid (optyp aop, shared_ptr<SPSolid> as1, shared_ptr<SPSolid> as2) 
    : s1(as1), s2(as2), owner(true), op(aop) 
  { 
    if (aop == UNION)
      solid = new Solid (Solid::UNION, s1->GetSolid(), s2->GetSolid());
    else if (aop == SECTION)
      solid = new Solid (Solid::SECTION, s1->GetSolid(), s2->GetSolid());
    else if (aop == SUB)
      solid = new Solid (Solid::SUB, s1->GetSolid()); // , s2->GetSolid());
  }

  Solid * GetSolid() { return solid; }
  const Solid * GetSolid() const { return solid; }

  void GiveUpOwner() 
  { 
    owner = false; 
    if (s1) s1 -> GiveUpOwner();
    if (s2) s2 -> GiveUpOwner();
  }

  void AddSurfaces(CSGeometry & geom)
  {
    if (op == TERM)
      geom.AddSurfaces (solid->GetPrimitive());
    if (s1) s1 -> AddSurfaces (geom);
    if (s2) s2 -> AddSurfaces (geom);
  }

  void SetMaterial (string mat)  { material = mat; }

  string GetMaterial ()
  {
    if (!material.empty()) return material;
    if (s1)
      {
        string s1mat = s1->GetMaterial();
        if (!s1mat.empty()) return s1mat;
      }
    if (s2)
      {
        string s2mat = s2->GetMaterial();
        if (!s2mat.empty()) return s2mat;
      }
    return material;
  }

  void SetBC(int abc) 
  {
    if (bc == -1) 
      {
        bc = abc;
        if (s1) s1 -> SetBC(bc);
        if (s2) s2 -> SetBC(bc);
        if (op == TERM)
          {
            Primitive * prim = solid -> GetPrimitive();
            for (int i = 0; i < prim->GetNSurfaces(); i++)
              prim->GetSurface(i).SetBCProperty (abc);
            // cout << "set " << prim->GetNSurfaces() << " surfaces to bc " << bc << endl;
          }
      }
  }

  void SetBCName(string name) 
  {
    if (bcname == "") 
      {
        bcname = name;
        if (s1) s1 -> SetBCName(name);
        if (s2) s2 -> SetBCName(name);
        if (op == TERM)
          {
            Primitive * prim = solid -> GetPrimitive();
            for (int i = 0; i < prim->GetNSurfaces(); i++)
              prim->GetSurface(i).SetBCName (name);
            // cout << "set " << prim->GetNSurfaces() << " surfaces to bc " << bc << endl;
          }
      }
  }



  void SetMaxH(double amaxh) 
  {
    if (maxh == -1) 
      {
        maxh = amaxh;
        if (s1) s1 -> SetMaxH(maxh);
        if (s2) s2 -> SetMaxH(maxh);
        if (op == TERM)
          {
            Primitive * prim = solid -> GetPrimitive();
            for (int i = 0; i < prim->GetNSurfaces(); i++)
              prim->GetSurface(i).SetMaxH (maxh);
          }
      }
  }

  void SetColor(double ared, double agreen, double ablue)
  {
    red = ared;
    green = agreen;
    blue = ablue;
  }

  double GetRed() const { return red; }
  double GetGreen() const { return green; }
  double GetBlue() const { return blue; }

  void SetTransparent() { transp = true; }
  bool IsTransparent() { return transp; }

private:
  optyp op;
};

inline ostream & operator<< (ostream & ost, const SPSolid & sol)
{
  ost << *sol.GetSolid();
  return ost;
}

namespace netgen
{
  extern CSGeometry * ParseCSG (istream & istr, CSGeometry *instance=nullptr);
}


static Transformation<3> global_trafo(Vec<3> (0,0,0));

DLL_HEADER void ExportCSG(py::module &m)
{
  py::class_<NGDummyArgument>(m, "NGDummyArgument")
    .def("__bool__", []( NGDummyArgument &self ) { return false; } )
    ;
  
  py::class_<Point<2>> (m, "Point2d")
    .def(py::init<double,double>())
    .def ("__str__", &ToString<Point<2>>)
    .def(py::self-py::self)
    .def(py::self+Vec<2>())
    .def(py::self-Vec<2>())
    ;

  py::class_<Point<3>> (m, "Point3d")
    .def(py::init<double,double,double>())
    .def ("__str__", &ToString<Point<3>>)
    .def(py::self-py::self)
    .def(py::self+Vec<3>())
    .def(py::self-Vec<3>())
    ;

  m.def ("Pnt", FunctionPointer
           ([](double x, double y, double z) { return global_trafo(Point<3>(x,y,z)); }));
  m.def ("Pnt", FunctionPointer
           ([](double x, double y) { return Point<2>(x,y); }));

           
  m.def ("Pnt", FunctionPointer
           ([](double x, double y, double z) { return Point<3>(x,y,z); }));
  m.def ("Pnt", FunctionPointer
           ([](double x, double y) { return Point<2>(x,y); }));

  m.def ("SetTransformation", FunctionPointer
           ([](int dir, double angle)
            {
              if (dir > 0)
                global_trafo.SetAxisRotation (dir, angle*M_PI/180);
              else
                global_trafo = Transformation<3> (Vec<3>(0,0,0));
            }),
         py::arg("dir")=int(0), py::arg("angle")=int(0));

  py::class_<Vec<2>> (m, "Vec2d")
    .def(py::init<double,double>())
    .def ("__str__", &ToString<Vec<3>>)
    .def(py::self+py::self)
    .def(py::self-py::self)
    .def(-py::self)
    .def(double()*py::self)
    .def("Norm", &Vec<2>::Length)
    ;

  py::class_<Vec<3>> (m, "Vec3d")
    .def(py::init<double,double,double>())
    .def ("__str__", &ToString<Vec<3>>)
    .def(py::self+py::self)
    .def(py::self-py::self)
    .def(-py::self)
    .def(double()*py::self)
    .def("Norm", &Vec<3>::Length)
    ;

  m.def ("Vec", FunctionPointer
           ([] (double x, double y, double z) { return global_trafo(Vec<3>(x,y,z)); }));
  m.def ("Vec", FunctionPointer
           ([] (double x, double y) { return Vec<2>(x,y); }));


  py::class_<SplineGeometry<2>> (m, "SplineCurve2d")
    .def(py::init<>())
    .def ("AddPoint", FunctionPointer
          ([] (SplineGeometry<2> & self, double x, double y)
           {
             self.geompoints.Append (GeomPoint<2> (Point<2> (x,y)));
             return self.geompoints.Size()-1;
           }))
    .def ("AddSegment", FunctionPointer
          ([] (SplineGeometry<2> & self, int i1, int i2)
           {
             self.splines.Append (new LineSeg<2> (self.geompoints[i1], self.geompoints[i2]));
           }))
    .def ("AddSegment", FunctionPointer
          ([] (SplineGeometry<2> & self, int i1, int i2, int i3)
           {
             self.splines.Append (new SplineSeg3<2> (self.geompoints[i1], self.geompoints[i2], self.geompoints[i3]));
           }))
    ;

  py::class_<SplineGeometry<3>,shared_ptr<SplineGeometry<3>>> (m,"SplineCurve3d")
    .def ("AddPoint", FunctionPointer
          ([] (SplineGeometry<3> & self, double x, double y, double z)
           {
             self.geompoints.Append (GeomPoint<3> (Point<3> (x,y,z)));
             return self.geompoints.Size()-1;
           }))
    .def ("AddSegment", FunctionPointer
          ([] (SplineGeometry<3> & self, int i1, int i2)
           {
             self.splines.Append (new LineSeg<3> (self.geompoints[i1], self.geompoints[i2]));
           }))
    .def ("AddSegment", FunctionPointer
          ([] (SplineGeometry<3> & self, int i1, int i2, int i3)
           {
             self.splines.Append (new SplineSeg3<3> (self.geompoints[i1], self.geompoints[i2], self.geompoints[i3]));
           }))
    ;

  py::class_<SplineSurface, shared_ptr<SplineSurface>> (m, "SplineSurface",
			 "A surface for co dim 2 integrals on the splines")
    .def("__init__", FunctionPointer  ([](SplineSurface* instance, shared_ptr<SPSolid> base, py::list cuts)
	     {
	       auto primitive = dynamic_cast<OneSurfacePrimitive*> (base->GetSolid()->GetPrimitive());
	       auto acuts = new Array<OneSurfacePrimitive*>();
	       for(int i = 0; i<py::len(cuts);i++)
		 {
		   py::extract<shared_ptr<SPSolid>> sps(cuts[i]);
		   if(!sps.check())
		     throw NgException("Cut must be SurfacePrimitive in constructor of SplineSurface!");
		   auto sp = dynamic_cast<OneSurfacePrimitive*>(sps()->GetSolid()->GetPrimitive());
		   if(sp)
		     acuts->Append(sp);
		   else
		     throw NgException("Cut must be SurfacePrimitive in constructor of SplineSurface!");
		 }
	       if(!primitive)
		 throw NgException("Base is not a SurfacePrimitive in constructor of SplineSurface!");
	       new (instance) SplineSurface(primitive,acuts);
	     }),py::arg("base"), py::arg("cuts")=py::list())
    .def("AddPoint", FunctionPointer
	 ([] (SplineSurface & self, double x, double y, double z, bool hpref)
	  {
	    self.AppendPoint(Point<3>(x,y,z),hpref);
	    return self.GetNP()-1;
	  }),
	 py::arg("x"),py::arg("y"),py::arg("z"),py::arg("hpref")=false)
    .def("AddSegment", FunctionPointer
	 ([] (SplineSurface & self, int i1, int i2, string bcname, double maxh)
	  {
	    auto str = new string(bcname);
	    self.AppendSegment(new LineSeg<3>(self.GetPoint(i1),self.GetPoint(i2)),str,maxh);
	  }),
	 py::arg("pnt1"),py::arg("pnt2"),py::arg("bcname")="default", py::arg("maxh")=-1.)
    ;
  
  py::class_<SPSolid, shared_ptr<SPSolid>> (m, "Solid")
    .def ("__str__", &ToString<SPSolid>)
    .def ("__add__", FunctionPointer( [] ( shared_ptr<SPSolid> self, shared_ptr<SPSolid> other) { return make_shared<SPSolid> (SPSolid::UNION, self, other); }))
    .def ("__mul__", FunctionPointer( [] ( shared_ptr<SPSolid> self, shared_ptr<SPSolid> other) { return make_shared<SPSolid> (SPSolid::SECTION, self, other); }))
    .def ("__sub__", FunctionPointer
          ([] ( shared_ptr<SPSolid> self, shared_ptr<SPSolid> other) 
           { return make_shared<SPSolid> (SPSolid::SECTION, self, 
                                          make_shared<SPSolid> (SPSolid::SUB, other, nullptr)); }))

    .def ("bc", FunctionPointer([](shared_ptr<SPSolid> & self, int nr) -> shared_ptr<SPSolid> 
                                { self->SetBC(nr); return self; }))
    .def ("bc", FunctionPointer([](shared_ptr<SPSolid> & self, string name) -> shared_ptr<SPSolid> 
                                { self->SetBCName(name); return self; }))
    .def ("maxh", FunctionPointer([](shared_ptr<SPSolid> & self, double maxh) -> shared_ptr<SPSolid> 
                                { self->SetMaxH(maxh); return self; }))
    .def ("mat", FunctionPointer([](shared_ptr<SPSolid> & self, string mat) -> shared_ptr<SPSolid> 
                                 { self->SetMaterial(mat); return self; }))
    .def ("mat", &SPSolid::GetMaterial)
    .def("col", FunctionPointer([](shared_ptr<SPSolid> & self, py::list rgb) -> shared_ptr<SPSolid>
                                { 
                                  py::extract<double> red(rgb[0]);
                                  py::extract<double> green(rgb[1]);
                                  py::extract<double> blue(rgb[2]);
                                  self->SetColor(red(),green(),blue());
                                  return self; 
                                }))
    .def("transp", FunctionPointer([](shared_ptr<SPSolid> & self)->shared_ptr < SPSolid > { self->SetTransparent(); return self; }))
    ;

  m.def ("Sphere", FunctionPointer([](Point<3> c, double r)
                                     {
                                       Sphere * sp = new Sphere (c, r);
                                       Solid * sol = new Solid (sp);
                                       return make_shared<SPSolid> (sol);
                                     }));
  m.def ("Plane", FunctionPointer([](Point<3> p, Vec<3> n)
                                    {
                                      Plane * sp = new Plane (p,n);
                                      Solid * sol = new Solid (sp);
                                      return make_shared<SPSolid> (sol);
                                    }));
  m.def ("Cone", FunctionPointer([](Point<3> a, Point<3> b, double ra, double rb)
                                       {
                                         Cone * cyl = new Cone (a, b, ra, rb);
                                         Solid * sol = new Solid (cyl);
                                         return make_shared<SPSolid> (sol);
                                       }));
  m.def ("Cylinder", FunctionPointer([](Point<3> a, Point<3> b, double r)
                                       {
                                         Cylinder * cyl = new Cylinder (a, b, r);
                                         Solid * sol = new Solid (cyl);
                                         return make_shared<SPSolid> (sol);
                                       }));
  m.def ("OrthoBrick", FunctionPointer([](Point<3> p1, Point<3> p2)
                                         {
                                           OrthoBrick * brick = new OrthoBrick (p1,p2);
                                           Solid * sol = new Solid (brick);
                                           return make_shared<SPSolid> (sol);
                                         }));
  m.def ("Revolution", FunctionPointer([](Point<3> p1, Point<3> p2,
                                            const SplineGeometry<2> & spline)
                                         {
                                           Revolution * rev = new Revolution (p1, p2, spline);
                                           Solid * sol = new Solid(rev);
                                           return make_shared<SPSolid> (sol);
                                         }));
  
  m.def ("Or", FunctionPointer([](shared_ptr<SPSolid> s1, shared_ptr<SPSolid> s2)
                                 {
                                   return make_shared<SPSolid> (SPSolid::UNION, s1, s2);
                                 }));
  m.def ("And", FunctionPointer([](shared_ptr<SPSolid> s1, shared_ptr<SPSolid> s2)
                                  {
                                    return make_shared<SPSolid> (SPSolid::SECTION, s1, s2);
                                  }));


  py::class_<CSGeometry,shared_ptr<CSGeometry>> (m, "CSGeometry")
    .def(py::init<>())
    .def("__init__", 
                                           [](CSGeometry *instance, const string & filename)
                                            {
                                              cout << "load geometry";
                                              ifstream ist(filename);
                                              ParseCSG(ist, instance);
                                              instance -> FindIdenticSurfaces(1e-8 * instance->MaxSize()); 
                                            })
    .def("__init__",
                                           [](CSGeometry *instance, const py::list & solidlist)
                                            {
                                              cout << "csg from list";
                                              new (instance) CSGeometry();
                                              for (int i = 0; i < len(solidlist); i++)
                                                {
                                                  py::object obj = solidlist[i];
                                                  cout << "obj " << i << endl;

                                                  py::extract<shared_ptr<SPSolid>> solid(solidlist[i]);
                                                  if(solid.check())
                                                    {
                                                      cout << "its a solid" << endl;
                                                      solid()->AddSurfaces (*instance);
                                                      solid()->GiveUpOwner();
                                                      int tlonr = instance->SetTopLevelObject (solid()->GetSolid());
                                                      instance->GetTopLevelObject(tlonr) -> SetMaterial(solid()->GetMaterial());
                                                    }
                                                }
                                              instance -> FindIdenticSurfaces(1e-8 * instance->MaxSize()); 
                                            })

    .def("Save", FunctionPointer([] (CSGeometry & self, string filename)
                                 {
                                   cout << "save geometry to file " << filename << endl;
                                   self.Save (filename);
                                 }))
    .def("Add",
         [] (CSGeometry & self, shared_ptr<SPSolid> solid, py::list bcmod)
          {
            solid->AddSurfaces (self);
            solid->GiveUpOwner();
            int tlonr = self.SetTopLevelObject (solid->GetSolid());
            self.GetTopLevelObject(tlonr) -> SetMaterial(solid->GetMaterial());
            self.GetTopLevelObject(tlonr) -> SetRGB(solid->GetRed(),solid->GetGreen(),solid->GetBlue());
            self.GetTopLevelObject(tlonr)->SetTransparent(solid->IsTransparent());

            // bcmod is list of tuples ( solid, bcnr )
            for (int i = 0; i < py::len(bcmod); i++)
              {
                py::tuple tup = py::extract<py::tuple> (bcmod[i]) ();
                auto mod_solid = py::extract<shared_ptr<SPSolid>> (tup[0]) ();
                int mod_nr = -1;
                string * bcname = nullptr;
                py::object val = tup[1];
                if (py::extract<int>(val).check()) mod_nr = py::extract<int> (val)();
                if (py::extract<string>(val).check()) bcname = new string ( py::extract<string> (val)());

                Array<int> si;
                mod_solid -> GetSolid() -> GetSurfaceIndices (si);
                // cout << "change bc on surfaces: " << si << " to " << mod_nr << endl;

                for (int j = 0; j < si.Size(); j++)
                  {
                    CSGeometry::BCModification bcm;
                    bcm.bcname = bcname ? new string (*bcname) : nullptr;
                    bcm.tlonr = tlonr;
                    bcm.si = si[j];
		    bcm.bcnr = mod_nr;
		    self.bcmodifications.Append (bcm);
                  }
                delete bcname;
              }
            return tlonr;
          },
          py::arg("solid"), py::arg("bcmod")=py::list()
         )

    .def("AddSurface", FunctionPointer
         ([] (CSGeometry & self, shared_ptr<SPSolid> surface, shared_ptr<SPSolid> solid)
          {
            solid->AddSurfaces (self);
            solid->GiveUpOwner();
            Surface & surf = surface->GetSolid()->GetPrimitive()->GetSurface();
            int tlonr = self.SetTopLevelObject (solid->GetSolid(), &surf);
            // self.GetTopLevelObject(tlonr) -> SetMaterial(solid->GetMaterial());
            self.GetTopLevelObject(tlonr) -> SetBCProp(surf.GetBCProperty());
            self.GetTopLevelObject(tlonr) -> SetBCName(surf.GetBCName());
            
            self.GetTopLevelObject(tlonr) -> SetRGB(solid->GetRed(),solid->GetGreen(),solid->GetBlue());
            self.GetTopLevelObject(tlonr)->SetTransparent(solid->IsTransparent());
          }),
         py::arg("surface"), py::arg("solid")
         )
    .def("AddSplineSurface", FunctionPointer
	 ([] (CSGeometry & self, shared_ptr<SplineSurface> surf)
	  {
	    auto cuttings = surf->CreateCuttingSurfaces();
	    auto spsol = make_shared<SPSolid>(new Solid(&*surf));
	    for(auto cut : (*cuttings)){
	      spsol = make_shared<SPSolid>(SPSolid::SECTION,spsol,make_shared<SPSolid>(new Solid(cut)));
	    }
	    spsol->AddSurfaces(self);
	    int tlonr = self.SetTopLevelObject(spsol->GetSolid(), &*surf);
	    for(auto p : surf->GetPoints())
		self.AddUserPoint(p);
	  }),
	  py::arg("SplineSurface"))

    .def("CloseSurfaces", FunctionPointer
         ([] (CSGeometry & self, shared_ptr<SPSolid> s1, shared_ptr<SPSolid> s2, py::list aslices )
          {
            Array<int> si1, si2;
            s1->GetSolid()->GetSurfaceIndices (si1);
            s2->GetSolid()->GetSurfaceIndices (si2);
            cout << "surface ids1 = " << si1 << endl;
            cout << "surface ids2 = " << si2 << endl;

            Flags flags;

            try
            {
                int n = py::len(aslices);
                Array<double> slices(n);
                for(int i=0; i<n; i++)
                {
                    slices[i]= py::extract<double>(aslices[i])();
                }
                flags.SetFlag("slices", slices);
            }
            catch( py::error_already_set const & ) {
                cout << "caught python error:" << endl;
                PyErr_Print();
            }

            const TopLevelObject * domain = nullptr;
            self.AddIdentification
              (new CloseSurfaceIdentification
               (self.GetNIdentifications()+1, self,
                self.GetSurface (si1[0]), self.GetSurface (si2[0]),
                domain,
                flags));
          }),
         py::arg("solid1"), py::arg("solid2"), py::arg("slices")
         )
    .def("CloseSurfaces", FunctionPointer
         ([] (CSGeometry & self, shared_ptr<SPSolid> s1, shared_ptr<SPSolid> s2, int reflevels)
          {
            Array<int> si1, si2;
            s1->GetSolid()->GetSurfaceIndices (si1);
            s2->GetSolid()->GetSurfaceIndices (si2);
            cout << "surface ids1 = " << si1 << endl;
            cout << "surface ids2 = " << si2 << endl;

            Flags flags;
            const TopLevelObject * domain = nullptr;
            self.AddIdentification 
              (new CloseSurfaceIdentification 
               (self.GetNIdentifications()+1, self, 
                self.GetSurface (si1[0]), self.GetSurface (si2[0]),
                domain,
                flags));
          }),
         py::arg("solid1"), py::arg("solid2"), py::arg("reflevels")=2
         )
    
    .def("PeriodicSurfaces", FunctionPointer
         ([] (CSGeometry & self, shared_ptr<SPSolid> s1, shared_ptr<SPSolid> s2)
          {
            Array<int> si1, si2;
            s1->GetSolid()->GetSurfaceIndices (si1);
            s2->GetSolid()->GetSurfaceIndices (si2);
            cout << "identify surfaces " << si1[0] << " and " << si2[0] << endl;
            self.AddIdentification 
              (new PeriodicIdentification 
               (self.GetNIdentifications()+1, self, 
                self.GetSurface (si1[0]), self.GetSurface (si2[0])));
          }),
         py::arg("solid1"), py::arg("solid2")
         )
    
    .def("GetTransparent", FunctionPointer
         ([] (CSGeometry & self, int tlonr)
          {
            return self.GetTopLevelObject(tlonr)->GetTransparent();
          }),
         py::arg("tlonr")
         )
    .def("SetTransparent", FunctionPointer
         ([] (CSGeometry & self, int tlonr, bool transparent)
          {
            self.GetTopLevelObject(tlonr)->SetTransparent(transparent);
          }),
         py::arg("tlonr"), py::arg("transparent")
         )

    .def("GetVisible", FunctionPointer
         ([] (CSGeometry & self, int tlonr)
          {
            return self.GetTopLevelObject(tlonr)->GetVisible();
          }),
         py::arg("tlonr")
         )
    .def("SetVisible", FunctionPointer
         ([] (CSGeometry & self, int tlonr, bool visible)
          {
            self.GetTopLevelObject(tlonr)->SetVisible(visible);
          }),
         py::arg("tlonr"), py::arg("visible")
         )
    .def("SetBoundingBox", FunctionPointer
         ([] (CSGeometry & self, Point<3> pmin, Point<3> pmax)
          {
            self.SetBoundingBox(Box<3> (pmin, pmax));
          }),
         py::arg("pmin"), py::arg("pmax")
         )
    .def("Draw", FunctionPointer
         ([] (shared_ptr<CSGeometry> self)
          {
             self->FindIdenticSurfaces(1e-6);
             self->CalcTriangleApproximation(0.01, 20);
             ng_geometry = self;
          })
         )
    .def_property_readonly ("ntlo", &CSGeometry::GetNTopLevelObjects)
    ;

  m.def("GenerateMesh", FunctionPointer
          ([](shared_ptr<CSGeometry> geo, MeshingParameters & param)
           {
             auto dummy = make_shared<Mesh>();
             SetGlobalMesh (dummy);
             dummy->SetGeometry(geo);
	     ng_geometry = geo;
             geo->FindIdenticSurfaces(1e-8 * geo->MaxSize());
             try
               {
                 geo->GenerateMesh (dummy, param);
               }
             catch (NgException ex)
               {
                 cout << "Caught NgException: " << ex.What() << endl;
               }
             return dummy;
           }))
    ;

  m.def("Save", FunctionPointer 
          ([](const Mesh & self, const string & filename, const CSGeometry & geom)
           {
             ostream * outfile;
             if (filename.substr (filename.length()-3, 3) == ".gz")
               outfile = new ogzstream (filename.c_str());
             else
               outfile = new ofstream (filename.c_str());
             
             self.Save (*outfile);
             *outfile << endl << endl << "endmesh" << endl << endl;
             geom.SaveToMeshFile (*outfile);
             delete outfile;
           }))
    ;



  m.def("ZRefinement", FunctionPointer
          ([](Mesh & mesh, CSGeometry & geom)
          {
            ZRefinementOptions opt;
            opt.minref = 5;
            ZRefinement (mesh, &geom, opt);
          }))
    ;
}

PYBIND11_PLUGIN(libcsg) {
  py::module m("csg", "pybind csg");
  ExportCSG(m);
  return m.ptr();
}
#endif