CGAL users discussion list

[Lettuce <>]

Hello,
firstly i use CGAL::poisson_suface_reconstruction_delaunay to creat a mesh
here is the code

CGAL::poisson_surface_reconstruction_delaunay
                (points.begin(), points.end(),
                CGAL::First_of_pair_property_map<Pwn>(),
                CGAL::Second_of_pair_property_map<Pwn>(),
                P, average_spacing);

then i want to use opengl to rending it and the code is

void gl_draw_facet(Polyhedron::Facet_iterator f){
        Polyhedron::Halfedge_around_facet_circulator he = f->facet_begin();
        do{
        const Point& p = he->vertex()->point();
                glVertex3d(p.x(), p.y(), p.z());
        } while (++he != f->facet_begin());
}

void drawPoint(){
        Polyhedron::Vertex_iterator v;
        Polyhedron::Facet_iterator f;
        Polyhedron::Edge_iterator eit;
        Polyhedron::Halfedge_handle h_handle;
        double x, y, z;

        CGAL::Polygon_mesh_processing::compute_normals(P,
                boost::make_assoc_property_map(vnormals),
                boost::make_assoc_property_map(fnormals));
                
        glBegin(GL_TRIANGLES);
                for (f = P.facets_begin(); f != P.facets_end(); f++){
                        xx = fnormals[f].x() / 
sqrt((fnormals[f].x()*fnormals[f].x()) +
(fnormals[f].y()*fnormals[f].y()) + (fnormals[f].z()*fnormals[f].z()));
                        yy = fnormals[f].y() / 
sqrt((fnormals[f].x()*fnormals[f].x()) +
(fnormals[f].y()*fnormals[f].y()) + (fnormals[f].z()*fnormals[f].z()));
                        zz = fnormals[f].z() / 
sqrt((fnormals[f].x()*fnormals[f].x()) +
(fnormals[f].y()*fnormals[f].y()) + (fnormals[f].z()*fnormals[f].z()));
                        glNormal3f(xx, yy, zz);
                        gl_draw_facet(f);
                }
                glEnd();        
}
but the result shows there is something wrong with the normals. here is the
result
<http://cgal-discuss.949826.n4.nabble.com/file/t375948/cat.png> 

i dont know what's wrong with my code.

need help,thank you.





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