CGAL users discussion list

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Dear CGAL users,
I want to attach an item per vertex to a set of points for which I want the
convex hull (let say an index).
I have understood that I need to refine CGAL::Polyhedron_items_3 as in the
examples:

examples/Polyhedron/polyhedron_prog_color.cpp
examples/Surface_mesh_simplification/edge_collapse_enriched_polyhedron.cpp

however in these examples, the custom field of the face/edge is filled after
the construction, but I would like to provide a point with the appropriate
index before a call to convex_hull_3.
It probably means that I have to define my own kind of point (probably derived
from one of the CGAL class).
As I am not sure if this is even possible, I would be really happy if somebody
can share her/his experience with such a problem such that I can switch to an
other implementation as quickly as possible if my understanding is correct.

Is there an example of such a specialization somewhere in the documentation
that I missed?
Did somebody already have solved this kind of problem?


- thank you in advance,

Manuel