CGAL users discussion list

[Manuel Caroli <>]

Thomas Zangl wrote:
> Hi!
>
> I want to add some stati to a facet of a Triangulation_3. I found 
> vertex_base_with_info and cell_base_with_info. So, what would you 
> recommend to use to add some information on a per facet base? (best 
> practice) I would need some structure (the info/statis) to be easly and 
> fast accessable when iterating over the facets of the triangulation with 
> a facet iterator.
A facet is represented by a (Cell_handle,int) pair. Thus I would store 
the information in a four-tuple in the cell (each entry of the 
four-tuple corresponds to one facet). Then you can access it like:
facet->first->info()->get_entry(facet->second) The only drawback is that 
you have to store the info twice per facet. But right now I don't see a 
possibility to overcome this.
If you store it in the vertex, then it is much more complicated to 
"find" the corresponding facet. And also you don't know how many facets 
are incident to a vertex.

best

Manuel