CGAL users discussion list

[Pierre Alliez <>]

hi Bill,

one solution is to hack something like (assume member function of your 
enriched polyhedron)

  // write in obj file format (OBJ).
  void write_obj(char *pFilename,
                  int incr  = 1) // 1-based by default
  {
    std::ofstream stream(pFilename);

    // output vertices
    for(Point_iterator pPoint = points_begin();
        pPoint != points_end();
        pPoint++)
      stream << 'v' << ' ' << pPoint->x() << ' ' <<
                              pPoint->y() << ' ' <<
                              pPoint->z() << std::endl;

    // precompute vertex indices
    this->set_index_vertices();

// this assumes you have defined an index per vertex
// and the function:

  void set_index_vertices()
  {
    unsigned int index = 0;
    for(Vertex_iterator v = vertices_begin();
        v!= vertices_end();
        v++)
      v->index(index++);
  }
// or something with a STL map to associate one index per vertex


    // output facets
    for(Facet_iterator pFacet = facets_begin();
        pFacet != facets_end();
        pFacet++)
    {
      stream << 'f';
      Halfedge_around_facet_circulator pHalfedge = pFacet->facet_begin();
      do
        stream << ' ' << pHalfedge->vertex()->index()+incr;
      while(++pHalfedge != pFacet->facet_begin());
      stream << std::endl;
    }
  }