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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?

/**********/
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;
                        
                }