CGAL users discussion list

[David Coeurjolly <>]

Dear cgal-discuss,

I'm having issues with a customization of CGAL Polyhedron_3 and after 
discussing about that with couple of CGAL gurus, I'm posting my problem here. 

I would like to construct a Polyhedron_3 upon a specific point class (not a 
custom vertex class via wrappers). More precisely, I would like to use  
Weighted_point  class which decorated a template class point with "weights" 
(note: Weighted_Point inherits from the given class Point). Hence, my new 
class of points satisfies with the point concept and many of the 
methods/functions dealing with points can use the weighted points.... except 
Polyherdon_3...

More precisely, I'm doing something like that:

typedef CGAL::Exact_predicates_inexact_constructions_kernel     K;
struct My_items : public CGAL::Polyhedron_items_3 
{
  template <class Refs, class Traits>
  struct Vertex_wrapper {
    typedef CGAL::Weighted_point<typename Traits::Point_3, double>  Point;  
//CustomPoints
    typedef CGAL::HalfedgeDS_vertex_base<Refs,CGAL::Tag_true,Point>  Vertex;
  };
  template < class Refs, class Traits>
  struct Halfedge_wrapper {
    typedef CGAL::HalfedgeDS_halfedge_base<Refs>                      
Halfedge;
  };
  template < class Refs, class Traits>
  struct Face_wrapper {
    typedef typename Traits::Plane_3 Plane;
    typedef CGAL::HalfedgeDS_face_base<Refs, CGAL::Tag_true, Plane>   Face;
  };
};
typedef CGAL::Polyhedron_3<K, My_items >     Polyhedron_3;

but when I want to use it (for example to compute the convex hull of weighted 
point considering only the point coordinates), I get an compilation error in 
the Polyhedron_3 class  (not matching function 
‘CGAL::HalfedgeDS_in_place_list_vertex<...) which seems to be related to 
Halfedge containers. Note: for the rest of the process, I really need the 
weights to be associated with the points and not the polyhedron 3 vertices...
 
Am I doing something wrong ? How can I customize the Point class in 
Polyhedron ? 

thanks in advance,
David Coeurjolly


----------------
David Coeurjolly - Directeur de recherche CNRS
CNRS, LIRIS-UMR 5205
Université de Lyon
Batiment Nautibus
43 boulevard du 11 novembre 1918, 69622 Villeurbanne cedex, France
Tel : (+33) [0]4.72.44.82.40  Fax : (+33) [0]4.72.43.15.36
http://liris.cnrs.fr/david.coeurjolly

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