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Hi,
I am working with a polyhedron_3, searching in it with an AABBTree. The
polyhedron is 2-Manifold and pure triangular mesh. My question is if I try to
use a Segment_3 that I know, in advanced, intersects in one vertice (with 5
facets around it) the tree.number_of_intersected_primitives(Segment) gives me 
5
intersections. But if I use the code to test what type of objects are. only 3
are Point_3. What are the other 2? 

This is is the code that I am using:
S is Segment_3
tree is AABBTree

std::cout << tree.number_of_intersected_primitives(S)
        << " intersection(s)" << std::endl;
        
std::list<Object_and_primitive_id> intersections;
tree.all_intersections(S, std::back_inserter(intersections));

std::list<Object_and_primitive_id>::iterator it;
std::cout << "intersections contains:\n";
for ( it=intersections.begin() ; it != intersections.end(); it++ ){
    Object_and_primitive_id op = *it;
    CGAL::Object object = op.first;
    Point_3 point;
    if(CGAL::assign(point,object))
         std::cout << "intersection object is a point : " << point <<
std::endl;
                        
     Segment segment;
    if(CGAL::assign(segment,object))
          std::cout << "intersection object is a segment : " << segment <<
std::endl;
                        
}