This is "normal" : by default the tolerance to distinguish separate
points/vertices is set to 1e-6 times the size of the model bounding box. Set
Geometry.Tolerance = 1e-12;
at the beginning of your script.
> On 21 Sep 2016, at 14:26, look <ml...@me.com> wrote:
> Hello all,
> I think I found a bug related to the extrusion (and recombination) of
> relatively small surfaces.
> The problem occurs when you try to extrude very small 2-D cells into the
> third dimension while having a huge domain, like it is often necessary for a
> resolved boundary layer mesh for a 2-D airfoil simulation.
> Gmsh then fails to recombine the extruded mesh into quadrangles.
> You can test this with the attached minimal example. It creates the mesh well
> until you uncomment the last line. You can then see in the GUI
> statistics-panel, that gmsh created triangles, which is obviously not
> Please see also the related discussion at cfd-online.com:
> Best regards,
> gmsh mailing list
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
Free software: http://gmsh.info | http://getdp.info | http://onelab.info
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