[Gmsh] Meshing STL File

[Christophe Geuzaine]

jbi35 at student.canterbury.ac.nz wrote:
> Hello Christophe,
> 
> yes I can send you the stl files with which the problem occurs. Please find two stl files
> of the same geometry but different element sizes attached to this email

Hi Jonas - The problem comes from the STL import: since there is no
connectivity in STL files, Gmsh has to use a geometrical tolerance to
determine when vertices are identical.

The default tolerance is a bit to large in your case, resulting in nodes
being merged that shouldn't have been. Add

Geometry.Tolerance = 1.e-12;

at the begining of your .geo file: it will decrease the tolerance and
should fix the problem.




> 
> kind regards
> jonas biehler
> 
> 
> 
>  On Thu 19/06/08  6:12 PM , Christophe Geuzaine cgeuzaine at ulg.ac.be sent:
>> jbi35 at student.canterbury.ac.nz wrote:
>>> Hi there,
>>> i am currently using gmsh to create 3d volume meshes
>> from an stl file, which describes the surface. In order to create meshes
>> with different mesh sizes i can create finer or coarser surface meshes(
>> stl's) The problem is that gmsh does not work for some mesh sizes
>>> e.g it works for 0.002 and 0.0022 but not for 0.0019 or
>> 0.0021.
>>> Has anybody had similar problems in the past ? Or knows
>> a remedy??
>>
>>
>> Could you send me the files? I cannot reproduce this problem with our 
>>
>> benchmark suite.
>>
>>
>>
>>
>>
>>
>>
>>> thanks for your help
>>> cheers jonas
>>>  
>>> _______________________________________________
>>> gmsh mailing list
>>> gmsh at geuz.org
>>> http://www.geuz.org/mailman/listinfo/gmsh
>>>
>>
>>
>>
>>
>> -- 
>>
>> Prof. Christophe Geuzaine
>>
>> University of Liege, Electrical Engineering and Computer Science
>>
>> http://www.montefiore.ulg.ac.be/~geuzaine
>>
>>
>>


-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine