[Gmsh] Problem when extruding a surface

[Christophe Geuzaine]

> On 5 Feb 2019, at 16:34, Michel Cassagnes <michel.cassagnes at noos.fr> wrote:
> 
> Dear all,
> 
> I have a surface containing points and lines (file enclosed).
> 
> When I extrude this surface, without extruding points and lines inside, Gmsh doesn't keep lines correctly. What can be seen on screen doesn't even match with script file. Please try with the file and comment/uncomment Extrude lines.
> 
> For example, line 19 on screen is between points 19 and 23, in script it is between points 22 and 23.
> 

You need to decrease the tolerance before the extrusion, e.g. set Geometry.Tolerance = 1e-3 before the Extrude command. (For extrusions the tolerance is relative to the size of the bounding box of the model -> the absolute tol at that point is about tol * 30).

> Thanks for your help !
> 
> Michel Cassagnes
> <fondations.model.geo><ExtrudeLinesUncommented.JPG><ExtrudeLinesCommented.JPG>_______________________________________________
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— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine