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[<>]

OH.

  I forgot something to say. The detail about
Triangulation_vertex_base_with_info_2 can refercnce to this page:

http://www.cs.tau.ac.il/CGAL/Manuals/doc_html/basic_lib/Triangulation_2_ref/Class_Triangulation_vertex_base_with_info_2.html#Cross_link_anchor_30

  In my sample file, I use following code to access my own structure likes:


        int tri_id = 0;
        for( Finite_faces_iterator fit = cdt.finite_faces_begin() ;
                fit != cdt.finite_faces_end();
                fit++ , tri_id ++)
        {
                CDT::Face faces = *fit;
                (fit->info()).Ttiangle_ID = tri_id++;
                ...
        }


                                                                              
eapping.