CGAL users discussion list

[Peter Hachenberger <>]

Hi Ruben,

I've never seen that happen before. CAn you please send me the whole
code, i.e., with type definitions. As far as I can see, this part of the
code is fine.

Peter

On Fri, 2007-08-03 at 12:49 +0200, Rubén Martínez wrote:
> My problem reside in de transformation from Nef 3 to Polyedron, this code:
> 
> N1.convert_to_Polyhedron(P);
> 
> 
> My complete code is this:
> 
> main(){
> 
> Polyhedron P;
>   char *path;
>   path = "polyhedron.off";
> 
>   P = readOFF (path);
> 
>   if(P.is_closed()) {
>     Nef_polyhedron N1(P);
> 
>     if(N1.is_simple()) {
>         N1.convert_to_Polyhedron(P);
>       std::cout << P;
>         std::cout << "Número de Vértices: ";
>         std::cout <<  P.size_of_vertices ();
>     }
>     else
>       std::cerr << "N1 is not a 2-manifold." << std::endl;
>   }
> }
> 
> And when I convert N1 (Nef 3) to P (Polyedron) i observe that the
> vertex are duplicated, for example:
> 
> In this tetrahedron, i f I load this in the Nef 3, i have this:
> 
> OFF
> 8 6 0
> # vertices
>  -1 -1  1
>  -1  1  1
>   1  1  1
>   1 -1  1
>  -1 -1 -1
>  -1  1 -1
>   1  1 -1
>   1 -1 -1
> # facets
>   4  3 2 1 0
>   4  0 1 5 4
>   4  6 5 1 2
>   4  3 7 6 2
>   4  4 7 3 0
>   4  4 5 6 7
> 
> 
> but if I execute the code N1.convert_to_Polyhedron(P); i obtain this result
> OFF
> 16 12 0
> 
>  -1 -1  1
>  -1  1  1
>   1  1  1
>   1 -1  1
>  -1 -1 -1
>  -1  1 -1
>   1  1 -1
>   1 -1 -1
>  -1 -1  1
>  -1  1  1
>   1  1  1
>   1 -1  1
>  -1 -1 -1
>  -1  1 -1
>   1  1 -1
>   1 -1 -1
> 
>   4  3 2 1 0
>   4  0 1 5 4
>   4  6 5 1 2
>   4  3 7 6 2
>   4  4 7 3 0
>   4  4 5 6 7
>   4  12 15  11 8
>   4  12  8  9 13
>   4  8  11  10  9
>   4  12  13  14  15
>   4  15  14  10  11
>   4  13  9  10  14
> 
> Anyone know any solution for this problem?????
> 
> Thanks
> 
> RMG
>