[Gmsh] API: Intersection + physical groups

[Christophe Geuzaine]

On 21 Mar 2013, at 10:54, Albert Ziegenhagel <aziegenhagel at web.de> wrote:

> Hi,
> 
> I need to cut out a part of a CAD geometry (stored in a GModel object) and preserve the physical groups in it.
> 
> 
> So what I have is a first CAD geometry that has physical groups set on it (e.g. the whole surface is one group and the whole volume is another).
> Then I have a second geometry that is always a simple box without any physical groups on it.
> Now I want to get the part of the first geometry, that intersects the second one but includes the (parts) of the physical groups as well.
> 
> 
> I tried to use the computeBoolenIntersection method provided by the GModel class, but it seems to discard the physical groups. The resulting geometry allways comes without any physical groups set.
> 
> 
> I'm I missing anything? Is this simply not implemented or is it a bug?

Hi Albert - It's just not implemented. Our current interface with external CAD creation routines is still quite "beta": we should definitely include a system that tries to preserve physical tags (as much as possible) when modifying a model.


> If it is not implement: could there by any other way to achieve the things I need?
> 
> 
> Thank you for your help in advance!
> 
> 
> Regards,
> Albert
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine