[Gmsh] terrain meshing with an stl file

[Julien Hess]

Hi Laurent,
Indeed, if you could have your terrain surface as a topology in e.g. 
STEP format, you could then import it in Gmsh and use it to "slice" a 
box (using boolean operations through the OCC kernel). I have done it 
multiple times.
A work-around is to do that with freecad (see e.g. the attached 
commands) and load the resulting STEP file in Gmsh.
Julien
On Wed, 20 Mar 2019 08:01:41, Christophe Geuzaine <cgeuzaine at uliege.be> 
wrote: Hi Laurent, It's doable, but since you would need to connect this 
discrete surface with new CAD surfaces to build a volume, it would be 
easier if the input mesh had a topology, i.e. if you provided the 
surface + the bounding curves + points for the 4 corners. Then new 
surfaces and a volume could be constructed, connected to these 
curves/points, and all the standard meshing algorithms could be used. 
Christophe

> On 19 Mar 2019, at 21:54, Laurent BRICTEUX<Laurent.BRICTEUX at umons.ac.be>  wrote:
>
> Dear all,
>
> Is it possible to obtain a volume mesh starting from an stl terrain surface (see attachment)?
> I would like to make a CFD mesh consisting in a volume box for which the bottom surface is a prescribed terrain.
> The elements should be tets only.
> Is there any example geo file that could help to solve my problem ?
>
> Thank you for your help and the nice piece of soft.
>
> Laurent
>
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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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