[Gmsh] mehsing errors with extrusions

Christophe Geuzaine cgeuzaine at ulg.ac.be
Tue Jan 5 19:48:01 CET 2016

> On 05 Jan 2016, at 16:15, Florian Kolbl <fkolbl at essex.ac.uk> wrote:
> Hi
> I am generating a mesh from segmented pictures using contour detection to make FEM computation on nerves. Basically I can have a 2D geometry from the segmentation, one example of my script output is on the file 2Dtest_nerve.geo, basically when I mesh it using a simple 'gmsh -2 2Dtest....' everything is fine.
> However the next step is to have a 3D structure, so in the test_nerve.geo a new extruded nerve is biolt from the 2D previous geometry. The resulting geometry is exactly as I expected nevertheless I have problems when computing the 3D mesh... I have a lot or error named 'Could not find extruded vertex'. I guess it is a classic error, I tried to compute the distance between the nearest point for each point and give a lc that would increase the density but I still have these errors...the currious thing is that when I open the mesh to see where are the missing elements, I find them all in certain parts of the last layer from the extrusion.
> Is there a something missing in my geo or is there a way to avoid this kind of meshing error ?

Recent versions (>= 2.9) should fix this. This is what I get with the latest stable release:

> Thanks
> Florian
> -- 
> Dr. Florian Kolbl
> Senior Research Officer
> University of Essex
> School of Computer Science and Electronic Engineering
> Brain-Computer Interface Lab
> Room 3A.532D
> Telephone 01206 874384
> Winvenhoe Park
> Colchester - Essex CO4 3SQ
> United Kingdom
> <2Dtest_nerve.geo><test_nerve.geo>_______________________________________________
> gmsh mailing list
> gmsh at geuz.org
> http://www.geuz.org/mailman/listinfo/gmsh

Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 

Tetrahedron V, July 4-5 2016: http://tetrahedron.montefiore.ulg.ac.be
Free software: http://gmsh.info | http://getdp.info | http://onelab.info

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