CGAL users discussion list

[Qingnan Zhou <>]

Dear all,

I noticed that CGAL's Nef Polyhedron gave incorrect result when the input contains multiple nested shells such as the nested_ball.off, which consists of 4 concentric spheres with normals pointing outward and inward in an alternating fashion.  When intersecting it with rectangular block, box.off, it produces the following output: out.off:

Where the correct output should be the following:

Is there anything special I need to do when using CGAL's Nef polyhedron class?  Thanks in advance!

best,

James