CGAL users discussion list

[Ruud Vlaming <>]

Hi Laurent,

Thank your for replying, i really appreciate it! 
The version i use seems to be 4.4:

  $ port installed | grep cgal
  cgal @4.4_0 (active)

The file CGAL/Mesh_3/Protect_edges_sizing_field.h has a date-stamp
of 21 September 2013:

  $ ls -la /opt/local/include/CGAL/Mesh_3/Protect_edges_sizing_field.h
  -rw-r--r--  1 root  admin  53901 Sep 21  2013 
/opt/local/include/CGAL/Mesh_3/Protect_edges_sizing_field.h

so this is probably not from the CGAL-4.5-beta1.

Btw, i have removed all internal 'structure' of the object,
and made it a lot less fine grained. The same error remains.
Also, i closely looked at the spots at which the error 
occurs. They are on an edge indeed, but they are not vertices themselves, 
and i cannot see anything special at that location. The object has
no unconnected vertices, is a manifold, etc.

Other possibilities?

kind regards,
Ruud

On 08/10/14 10:42, Laurent Rineau (CGAL/GeometryFactory) wrote:
> Le Tuesday 07 October 2014 17:12:25 Ruud Vlaming a écrit :
>> Hey Guys,
>>
>> I get the error:
>>
>> Point p[-9.91211 -13.5246 -10.8856], dim=1 and q[-9.9571 -13.5666 
>> -10.9184],
>> dim=1 form an edge but do not intersect ! CGAL error: assertion violation!
>> Expression : minimal_size_ > 0 || c3t3_.is_valid()
>> File       : /opt/local/include/CGAL/Mesh_3/Protect_edges_sizing_field.h
>> Line       : 370
>>
>> and stumbled on this link:
>>
>>   
>> http://cgal-discuss.949826.n4.nabble.com/Problem-when-meshing-polyhedron-wi
>> th-sharp-features-td4659217.html
>>
>> Are those issues solved in CGAL 4.4_0?
>>
>> If so, what might be causing this? The stl used
>> was checked with MeshLab to be singly connected,
>> but has same very sharp features and "tunnels".
>>
>> Thank you for any assistance.
> 
> There is a bug in the file <CGAL/Mesh_3/Protect_edges_sizing_field.h>, in
> CGAL-4.5-beta1. I assume that you are using that version of CGAL. The bug is
> not present in the previous released version CGAL-4.4, and it will be fixed 
> in
> next version CGAL-4.5, coming soon.
>