[Gmsh] Avoid duplicate entities with Geometry.OCCAutoFix = 0

[Christophe Geuzaine]

> On 9 Nov 2018, at 18:48, Juan Córcoles <juan.corcoles at uam.es> wrote:
> 
> Dear gmsh-list,
> 
> I have gone through several previous posts in the list archive to find a way to avoid the creation of duplicate surfaces when building a volume from a surface loop using the opencascade kernel (assuming I am merging a stp/igs file). I found that setting Geometry.OCCAutoFix = 0 should do the trick as I don't care about orientation. However, I am unable to make it work since the behaviour both with this flag set to 0 or 1 looks the same. Please find attached a small commented example in case anyone can help me.

Starting for IGS is a bad idea: all the entities are already duplicated in the file - load the IGS file alone and display e.g. the curve or surface tags to convince yourself. If you cannot create the geometry directly within Gmsh I would advise importing your geometry as a STEP file (or BREP if you build it with an OpenCASCADE-based CAD modeler).

Christophe

> 
> Thank you very much in advance,
> 
> -- 
> Juan Córcoles
> http://rfcas.eps.uam.es/juan.corcoles
> 
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— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine

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