CGAL users discussion list

[Rash <>]

Here is the solution

https://stackoverflow.com/questions/51148826/get-primitive-from-aabb-tree-intersection/51162811#51162811

Cgal has some nice features, but could realy use more documentation.

Am 03.07.2018 um 19:14 schrieb Rash:
> Dear Readers,
>
> I fail horribly at retrieving the primitive which causes the 
> intersection. I calculate a hit:
>
>                  boost::optional<Primitive_id> hit = 
> tree.first_intersected_primitive(rays[this->transformCoordinates(y,x)]);
>
> Then check if a hit happened:
>
> if(hit)
>
> And then the chaos starts. There is simply no "getIntersectedPrimitive" 
> member function of primitive id. What I am doing wrong? How can I do it 
> right?
>
> Currently I am getting an iterrator for faces (at least this is what I 
> think what I am doing). Then I get the first face. This seems to be a 
> pretty strange approach. How can I get the the normal of 
> I_Polyhedron_facet and how do I get the intersection point?
>
>
> CGAL::internal::In_place_list_iterator<CGAL::HalfedgeDS_in_place_list_face<CGAL::I_Polyhedron_facet<CGAL::HalfedgeDS_face_base<CGAL::HalfedgeDS_list_types<CGAL::Simple_cartesian<double>, 
> CGAL::I_Polyhedron_derived_items_3<CGAL::Polyhedron_items_3>, 
> std::allocator<int> >, CGAL::Boolean_tag<true>, 
> CGAL::Plane_3<CGAL::Simple_cartesian<double> > > > >, 
> std::allocator<CGAL::HalfedgeDS_in_place_list_face<CGAL::I_Polyhedron_facet<CGAL::HalfedgeDS_face_base<CGAL::HalfedgeDS_list_types<CGAL::Simple_cartesian<double>, 
> CGAL::I_Polyhedron_derived_items_3<CGAL::Polyhedron_items_3>, 
> std::allocator<int> >, CGAL::Boolean_tag<true>, 
> CGAL::Plane_3<CGAL::Simple_cartesian<double> > > > > > > it = *hit;
>
>
> CGAL::I_Polyhedron_facet<CGAL::HalfedgeDS_face_base<CGAL::HalfedgeDS_list_types<CGAL::Simple_cartesian<double>, 
> CGAL::I_Polyhedron_derived_items_3<CGAL::Polyhedron_items_3>, 
> std::allocator<int> >, CGAL::Boolean_tag<true>, 
> CGAL::Plane_3<CGAL::Simple_cartesian<double> > > 
>  >::Halfedge_around_facet_circulator ipfacet = it->facet_begin();
>
> Kind regards
> Rashid