CGAL users discussion list

[Sean Hardesty <>]

I have a collection of meshes that overlap slightly, so I am going through a loop removing overlapping pieces. It works for a while, but eventually I run into trouble. I am calling PMP::corefine_and_compute_difference (CGAL 4.11) on a pair of meshes that satisfy

!CGAL::Polygon_mesh_processing::does_self_intersect
CGAL::Polygon_mesh_processing::does_bound_a_volume

and I get the following:

terminate called after throwing an instance of 'CGAL::Assertion_exception'
  what():  CGAL ERROR: assertion violation!
Expr: hedge!=start
File: /usr/local/include/CGAL/Polygon_mesh_processing/internal/Corefinement/Visitor.h
Line: 663
Aborted (core dumped)

They are fairly small, so I wrote them to .off format and attached them to this message. I am aware from your documentation pages that there can be problems with sequential boolean operations, so I am using the kernel with exact predicates and exact constructions. Maybe the precision in the .off format is inadequate to diagnose the problem. I would be grateful for any help that can be provided.

    Sincerely,

    Sean Hardesty

Attachment: mesh1.off
Description: Binary data

Attachment: mesh2.off
Description: Binary data