[Gmsh] import + meshing of step file

Christophe Geuzaine cgeuzaine at ulg.ac.be
Fri Oct 15 07:38:47 CEST 2010

On 14/10/10 16:44, jb.leydet wrote:
> Hello,
> I'm facing a problem with gmsh:
> I'm trying to import and mesh a step file. All surfaces seem to have meshed properly, but then I get an error while trying to mesh the volume.
> I attach the error text (featuring some weird "Info : Starting subloop 4 in Line Loop 4 (are you sure about this?)" messages... maybe that could be the source of the pb?).

Hi Jean-Baptiste - don't export the .step into a .geo file! Just mesh 
the .step directly.

Let me repeat again for the list: saving "unrolled geo" files is mainly 
provided for debugging purposes. The .geo language is not as rich as the 
underlying abstract CAD descriptions: you loose information when you 
perform the .geo export.

Your model meshes nicely over here, but for some element sizes the 2D 
mesh self-intersects. You need to fine-tune mesh sizes a bit by hand in 
this case. Recent nigtly builds have also improved automatic 
curvature-based mesh size calculation, so you can e.g. use

gmsh air-channel.stp -clcurv -clscale 0.2

> I also attach the original step file and the final geo file.
> Thank you!
> Jean-Baptiste
> PS: beside that issue, I've been using gmsh to pre-process a few CFD simulations and it's been very helpful!
> Une messagerie gratuite, garantie à vie et des services en plus, ça vous tente ?
> Je crée ma boîte mail www.laposte.net
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Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science