CGAL users discussion list

["Laurent Rineau (GeometryFactory)" <>]

Le mardi 29 septembre 2009 20:55:05, 

 a écrit :
> Hello,
> 
> I'm a (very) beginner and I do need help (to start) !!!
> 
> I'm wondering how can get  I from HDS (it's a Polyhedron) the proper vertex
>  to use afterwards
> for rendering in OpenGL.
> 
> For example, I want to convert HDS into triplet of point (forming a
>  triangle)
> 
> -> Can anybody helps ?
> 
> That you so much for this little "coup de pouce"

You should have a look at the source code of the polyhedron demo, in 
demo/Polyhedron/, with CGAL>=3.4.

In CGAL-3.5, see the "draw" methods in Scene_polyhedron_item.cpp, and 
Scene_nef_polyhedron_item.cpp, which use code from 
demo/Polyhedron/include/CGAL/gl_render.h and 
demo/Polyhedron/Scene_nef_rendering.cpp.

The nef case shows the non-triangular case, which is far more complicated, as 
one has to triangulate each face of the polyhedron.

I hope that can help.

-- 
Laurent Rineau, PhD
Release Manager of the CGAL Project
http://www.cgal.org/
R&D Engineer at GeometryFactory
http://www.geometryfactory.com/