CGAL users discussion list

Le Mar 17 juillet 2007 19:34, Thomas Zangl - Home a écrit :
> I use the CGAL::Polyhedron_incremental_builder_3 to build a Polyhedron
> out of those sets. After inserting all points and all facets I get an
> assertion:
>
> CGAL::Polyhedron_incremental_builder_3<HDS>::
> lookup_halfedge(): input error: facet 2 shares a halfedge from vertex 86
> to vertex 16 with facet 1.
> CGAL error: assertion violation!

> I know that facet 2 and facet 1 have a common edge. That is by
> intention (the faces are from a triangulation). Is this a problem for
> the incremental builder?

If I remember correctly, someone talked recently about this subject on the
list.

Your facets should not share a halfedge: if they share an edge, you should
give them consistent orientations so that the halfedge of facet 2 is the
opposite of the halfedge of facet one.
-- 
Camille