[Gmsh] 1D mesh from .igs file

Christophe Geuzaine cgeuzaine at ulg.ac.be
Fri Jul 25 16:40:34 CEST 2008

Olivier Pierard wrote:
> Dear all,
> Please find in attachment a very simple 1D .igs file (which is a not 
> closed curve).  When I open it in Gmsh, it tries to close the curve so 
> that the mesh is far from what I expect.  Why is it behaving so and is 
> there any way to avoid it ?

Disabling OpenCascade CAD healing for small edges seems to fix the
problem: use "Geometry.OCCFixSmallEdges=0;" in a script, or
"Tools->Geometry->General->Remove small edges..." in the GUI.

PS: if possible use STEP files instead of IGES. The geometrical
tolerances required by IGES files are an unending source of problems.

> Thanks for any hint,
> Olivier Pierard
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Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science