CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

@Pierre, this won't work as here Surface_mesh is used and 2 identical 
ids might be associated with 2 different meshes.

The solution is to use set the AABB_tree template parameter
OneFaceGraphPerTree to false.

Sebastien.

On 12/26/2018 05:07 PM, Pierre Alliez wrote:
> 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