CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

Look at this file:

include/CGAL/convex_hull_3_to_polyhedron_3.h

and more precisely to the operator().

I am doing exactly what you want.

Maybe you could use that function:
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Convex_hull_3_ref/Function_convex_hull_3_to_polyhedron_3.html


Sebastien.


horstmann wrote:
> Thank you so much for your help. Now I have the data I needed
>
> I understand why we must consider only facets incident to an infinite cell,
> and I have read your links, but I'm not sure how to do it correctly (sorry
> about my ignorance in CGAL).
>
> At the moment, I'm doing that:
>
>
>         std::vector< std::pair<Point,unsigned> > points; // aux for
> triangulation
>         int **triangles; // Store resulting triangles indexes
>
>         for(i=0;i<NSPOINTS;i++)
>                 points.push_back( 
> std::make_pair(Point(GRID[i].x,GRID[i].y,GRID[i].z),i));
>
>         // building Delaunay triangulation.
>         Delaunay dt( points.begin(),points.end() );
>
>         // memory allocation for triangles
>         triangles = (int**)malloc(nt*sizeof(int*));
>         for(i=0;i&lt;nt;i++)
>                 triangles[i] = (int*)malloc(3*sizeof(int));
>
>         // Get &amp; Store the triangles
>         int n_triangles = 0,k1;
>         Delaunay::Finite_facets_iterator fit;
>         for (fit = dt.finite_facets_begin(); fit != dt.finite_facets_end(); 
> fit++){
>                 for(k1=1;k1&lt;=3;k1++)
>                         triangles[n_triangles][k1-1] = fit->first->vertex( 
> (fit->second+k1)%4
> )->info();
>                 n_triangles++;
>         }
>
> And works. So, how can I choose only the *surface triangles* among all the
> finite facets?
> I suppose, using "t.incident_cells" and "
> cell_handle->index(t.infinite_vertex())  " and probably others functions
> together with the Finite_facets_iterator, but I don't know how exactly...
>
>
> Thank you so much again in advance!!
>
> --
> View this message in context: 
> http://cgal-discuss.949826.n4.nabble.com/Help-getting-triangles-coordinates-from-Delaunay-Triangulation-tp3955310p3986844.html
> Sent from the cgal-discuss mailing list archive at Nabble.com.