CGAL users discussion list

[Cody Rose <>]

Hello,

I have run into a repeated problem where I have a Polyhedron_3 such that 
is_valid() and is_closed() both return true, but conversion to 
Nef_polyhedron_3 (using the Nef_polyhedron_3 constructor) fails. In 
Debug builds, an assertion is violated, and in Release builds, my 
program just crashes. I see in the documentation that this conversion is 
only possible if the point set is an oriented closed 2-manifold, and the 
function Polyhedron_3::is_closed() tests this, but this is clearly not 
the only failure mode, and the fact that any other failure modes that I 
don't anticipate results in crashes for my users is extremely 
unfortunate. Is there any way to force CGAL to fail this conversion in a 
predictable, catchable way even with NDEBUG defined? (Alternatively, is 
this just a bug? If so I can provide an example polygon that does this.)

Thank you,
Cody Rose