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[Ianic <>]

Dear Stephane,

Thank you for your reply. I mesh a single-domain geometry that has one cell
family and one facet family, i.e. boundary of my domain. I essentially
follow the liver example in doing this, and I only change the meshing
criteria but keep the optimization parameters at their default values. I
believe it implies that there is a perturbation step at the end. 

In my case I actually relied on vertices' tags, because I have to:

- remove unreferenced vertices that are not part of any cell (our finite
element code won't accept a mesh otherwise). I thought it would be easier to
NOT output them in CGAL in the first place. For that I added a small if()
check in the File_medit.h file to write out a vertex only if its tag is not
-1.
- I also need to identify what vertices lie on a boundary, i.e. belong to
facet. My understanding was that if a node belongs to a boundary facet it
means that, following your terminology, it has dim=2 and therefore it will
have a facet tag (which is ok since I only have one facet family).

As a reference, my output mesh had appr. 900 000 vertices, of which 430-ish
had a tag of "-1" and of those only 2 belonged to a c3t3 cell.
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