[Gmsh] visualization problem ?

[Christophe Geuzaine]

> On 11 Feb 2016, at 15:20, walter.steffe at alice.it wrote:
> 
> 
> 
>           I al already using the last stable version (gmsh 2.11.0)
> 
> I have investigated a little bit more and I have seen that the msh file contains a few lines as the followings
> 2 4 259
> Affine -0.9999999999999994 1.110223024625157e-16 0 0 -1.110223024625157e-16 -0.9999999999999994 0 0 0 0 1 0 0 0 0 1
> 64
> 14624 23986
> -1 23987
> -1 23990
> 
> The problem is related with the -1 value associated with the tags of some slave vertices.
> I have used GDB with a breackpoint  inside of the function writeMSHPeriodicNodes  (GModelIO_MSH.cpp line 574)
> I have also used a break point condition  (v1->getIndex() < 0) in order to spot the problematic data.
> So I have discovered that the slave vertex is good (for what concerns the geometrical position) but has an index= -1.
> 
> The problem now is that I do not know where the wrong index was generated.
> The slave vertex was created inside of the copyMesh(...) function:
>   MVertex *vt =new MFaceVertex ...
> But this function seems not to be the responsible for the index value of -1 (the MFaceVertex constructor sets that value to 0).
> 

The indexing is done in GModel::indexMeshVertices(). It looks like if the vertices keep the -1 index, it's because they do not belong to elements (triangles) that need to get saved !?

Let us know if you find the issue...


> And why most of the slave indices were properly renumbered with the exeption of those associated with face 4 (having master face=259) and a few others ?
>   
> 
> >I don't think so: the actual mesh is indeed incomplete. The problem is most probably in the generation of the slave mesh. Quite a bit of work has been going on on periodic meshes in recent releases: I would try with the latest stable release to see if the problem >persists.
> 
> 
> 
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine

Tetrahedron V, July 4-5 2016: http://tetrahedron.montefiore.ulg.ac.be
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