CGAL users discussion list

[Nicholas Mario Wardhana <>]

Hi all

I am trying to do convex decomposition given a closed boundary mesh.
In particular, I am using the code written in:

http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Convex_decomposition_3/Chapter_main.html

to decompose some models delivered in CGAL package. I have tested
different kernels, namely
CGAL::Exact_predicates_exact_constructions_kernel and
CGAL::Cartesian<CGAL::Gmpq>. It turned out that actually only a few
meshes can be decomposed into convex partitions, for example cross.off
and star.off, which are both of genus 0, and only possess a few
vertices, edges, and facets (each below 100). For other meshes, even
though they satisfy the precondition (I ran is_bounded() to know
whether a Nef Polyhedron is bounded, and many of these meshes are
bounded), the code fails and gives the following error:

CGAL error: assertion violation!
Expression :
File       : 
D:\nixx\Project\Testbed\dependencies\CGAL-3.8\include\CGAL/Convex_decomposition_3/SM_walls.h
Line       : 363
Explanation: wrong handle
Refer to the bug-reporting instructions at http://www.cgal.org/bug_report.html

I am wondering whether anybody knows what causes the error. FYI, I am
using CGAL 3.8, Visual Studio 2008, and Windows 7.

Thank you.

Best regards,
Nicholas

PS: sorry for sending two e-mails in less than 1 day, I just started
using this particular module and got confused