CGAL users discussion list

[Rash <>]

Hi guys,

for learning CGAL I wanted to write a small ray tracerIt works fine for 
hit detection and but I am not able to get the primitive which the ray 
has hit. So I can't compute the normal of the primitve.

#include <CGAL/AABB_tree.h>
#include <CGAL/Polyhedron_3.h>

    typedef CGAL::AABB_face_graph_triangle_primitive<Polyhedron> Primitive;


                boost::optional<Primitive_id> hit = 
tree.first_intersected_primitive(rays[this->transformCoordinates(y,x)]);

//okay we have a hit. Nice but how do we get the primitve?

std::cout << *hit << std::endl; //does not work, strange iterrator
std::cout << hit << std::endl; //does not work
std::cout << &hit << std::endl; //damn
std::cout << boost::get<Point>(&(hit)) << std::endl; //come one
std::cout << boost::get<Point>((hit)) << std::endl; //google doesnt help
std::cout << boost::get<Point>(*hit) << std::endl; //write an email

After using googled for two hours I gave up. Sorry, I am not too familar 
with boost.

Kind regards
Rashid