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[Ianic <>]

> No. It is a Cell_handle pointing to:
>   + an infinite cell, i.e. a cell which is incident to the infinite
> vertex (you could have a look in 3D Triangulation package documentation,
> and also here:
> http://www.cgal.org/Manual/last/doc_html/cgal_manual/TriangulationDS_3/Chapter_main.html).
>
>  + a finite cell which is not part of the domain discretization

So, I assume that c3t3.is_in_complex(neighbor) will issue false for both of
these cases, is that right?

As for the facets, your suggestion is spot-on! When a circulator went over
facets it sometimes looked at them from a different cell, so they were not
present in my map. In this case I now take its mirror facet as a key for my
std::map and obtain the correct facet number. Thank you for your help,
Stephane.
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