CGAL-based mesh generation often fails

[Prof Garth Wells]

CGAL-based mesh generation often fails with the message:

CGAL error: assertion violation!
Expression : 
File       : /Users/buildbot/local/include/CGAL/Mesh_3/Refine_facets_3.h
Line       : 573
Explanation: Mesh_3 ERROR: A facet is not in conflict with its refinement point!

A possible solution is to change the CGAL kernel type. See

http://cgal-discuss.949826.n4.nabble.com/remeshing-crash-a-problem-of-the-surface-mesh-generator-td2225698.html

[Prof Garth Wells]

Appears that exact kernel is not supported for polyhedra with features.

Some parameters changes appear to have helped.

[Prof Garth Wells]

Still failing often.

[Prof Garth Wells]

Many errors were due to STL bug that been fixed.