CGAL users discussion list

["Jingyi Jin" <>]

Hi Jari,

I think you can do somthing like:

 Point pt = h->point();
 cout << CGAL::to_double(pt[0]) << " " << CGAL::to_double(pt[1]) <<
CGAL::to_double(pt[2]) << endl;

I haven't used 3D Alpha Shapes, but I think its data structure should
be very similar to Triangulations...

Sincerely,

Jingyi

On 5/8/07, Jari Vauhkonen 
<>
 wrote:
> Hello,
>
> I'm a newbie with CGAL and programming overall. I've been trying to build 3D
> alpha shapes from point clouds, in which I have also succeeded.
>
> Now I'm interested in separating the points belonging to the interior, and
> correspondigly to the exterior, of the alpha shape computed, and outputting 
> the
> point coordinates into an ASCII file.
>
> I've got a list with Vertex_handle type and an iterator over it. Then, I have 
> no
> idea how to proceed: I've tried to explore for a method to convert a
> Vertex_handle into a Vertex, a point representation or straight into a
> coordinate string to print, with no success. What to do?
>
> Here's a piece of my code:
>
>        std::list<Vertex_handle> vertices;
>        as.get_alpha_shape_vertices (back_inserter(vertices), cells_type);
>        FILE *koe;
>        koe = fopen("testi.txt", "w");
>        for ( list<Vertex_handle>::iterator vert_it = vertices.begin();
>           vert_it != vertices.end(); vert_it++ ) {
>                Vertex_handle h = *vert_it;
>                // ??????
>        }
>        fclose (koe);
>
> This is probably truly amateurish, but I can't figure it out myself. Please
> help!
>
>
> Best regards,
>  Jari
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