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[MaelRL <>]

Hello,

A triangulation facet "f" is a pair of a Cell_handle "ch" (= f.first) and an
index "i" (= f.second) that is such that ch->vertex(i) is the opposite
vertex of "f" in "ch". Thus, you can get the three vertices of your facet
with:
f.first->vertex((f.second+1)%4) 
f.first->vertex((f.second+2)%4)
f.first->vertex((f.second+3)%4)

Then, by default a triangulation vertex does not contain a global index in
the triangulation, so you must either build a map<Point_3, index> or use
vertex_with_info
(https://doc.cgal.org/latest/Triangulation_3/classCGAL_1_1Triangulation__vertex__base__with__info__3.html)
and fill the map / info as you insert in the triangulation.



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