CGAL users discussion list

[babaOroms <>]

Thanks for your reply.
So with your advice, I think I am on the good way.
The intersection gives me a set of points but not segment.
So : Does my Build_polygon<HDS>::operator()( HDS&  hds ) function (in the
first post) is the good way to populate my polyhedron, i.e only one facets
of several points (about one hundred)
Here is my code to have the intersections :
typedef CGAL::Simple_cartesian<double>          Kernel;
    typedef CGAL::AABB_polyhedron_segment_primitive<Kernel,Polyhedron>
Primitive;
    typedef CGAL::AABB_traits<Kernel, Primitive> Traits;
    typedef CGAL::AABB_tree<Traits> Tree;
    typedef Tree::Object_and_primitive_id Object_and_primitive_id;

    typedef Kernel::FT FT;
    typedef Kernel::Point_3 Point;
    typedef Kernel::Vector_3 Vector;
    typedef Kernel::Plane_3 Plane;
    typedef Kernel::Segment_3 Segment;
    typedef Polyhedron::Halfedge Halfedge;

    foreach(RPolygon3d* poly3d, RCavity3d::cavity->polygons()) { //iterates
all my polygons
        poly3d->createCGALPolyhedron(); //create the polyhedron with
Build_polygon method
        Polyhedron* m_pPolyhedron = poly3d->polyhedron(); //get the
polyhedron pointer
        Tree
tree(m_pPolyhedron->halfedges_begin(),m_pPolyhedron->halfedges_end());

        Vector normal((FT)0.0,(FT)0.0,(FT)1.0);
        FT z = firstDepth;
        Point p((FT)0.0, (FT)0.0, z);
        Plane plane(p,normal);

        std::list<Object_and_primitive_id> intersections;
        tree.all_intersections(plane,std::back_inserter(intersections));
        std::list<Object_and_primitive_id>::iterator it;
        std::list<Segment> m_segments;

        for(it = intersections.begin();
            it != intersections.end();
            it++)
        {
            Object_and_primitive_id op = *it;
            CGAL::Object object = op.first;
            Segment segment;
            if(CGAL::assign(segment,object)) {
                m_segments.push_back(segment); //never succeed because
result is points
            }
        }
    }
I think I'm not so far.

Thanks in advance

And other question : Is it possible on this forum to write c++ code with
formatting (automatic color syntax and indentation)



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