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[WChXiong <>]

Hi, I'm new on CGAL.
When I use CGAL::make_surface_mesh() to get surface mesh, I need to get
consistency normals of every facets.Here my code:
        for (C2t3::Facet_iterator face= c2t3.facets_begin(); face !=
c2t3.facets_end(); ++face)
        {
                C2t3::Cell_handle ch;
                ch = face->first;
                int index = face->second;
                Point pt0 = ch->vertex((index+1)&3)->point();
                Point pt1 = ch->vertex((index+2)&3)->point();
                Point pt2 = ch->vertex((index+3)&3)->point();

                Vector normals = CGAL::cross_product(pt1 - pt0, pt2- pt0);
                normals = normals / CGAL::sqrt(normals * normals );
       }
But the result is not correct. The normals is not consistent. The
points(pt0, pt1, pt2) of face are not oriented ?? How I can get consistency
normals of every facets. Thank you.



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