CGAL users discussion list

[Pierre Alliez <>]

hi Lucio,

you could build a property map, that maps a face ID to each instance.
or you can also provide your own primitive, which would store the 
instance ID.

did you try this ?

pierre

Le 19/12/2018 à 06:44, Lucio Santi a écrit :
> Hello,
>
> I have an AABB tree storing triangular faces coming from different 
> surface mesh instances. I'm using that data structure to compute 
> intersections with rays, but currently the primitive ID that I obtain 
> for each intersection query is just a face index (i.e., an instance of 
> CGAL::Surface_mesh<Point_3>::Face_index). I would like to know which 
> surface mesh this face belongs to. Is there a clean way to do this? I 
> was thinking of providing my own AABB primitive somehow, but I'm not 
> sure if this is the proper way to do it (and in fact I'm not even sure 
> how this can be done).
>
> Thanks in advance for your help,
>
> Lucio


--
Pierre Alliez
Délégué scientifique (head of science)
Inria Project-team TITANE
Inria Sophia Antipolis - Mediterranee
http://www-sop.inria.fr/members/Pierre.Alliez/