[Gmsh] Mesh file format v4

Christophe Geuzaine cgeuzaine at uliege.be
Thu Aug 30 13:19:10 CEST 2018

> On 27 Aug 2018, at 11:33, Alessandro Vicini <alessandro.vicini at sitael.com> wrote:
> I generate a mesh using the latest v4.0 executable. If I look at the statistics I see 24207 nodes and 125393 tetrahedra.
> I export the mesh file using both v2 and v4 ascii formats. Now, in the v2 format file I see:
> $Nodes
> 22775
> While in the v4 format file I see:
> $Nodes 
> 887 24177
> My question is: why the total number of nodes is different in the two files, and why is it different from what I see in the statistics?

In MSH4 we currently save some nodes that are generated but not used in elements: this will be fixed in the next bug fix release.

> By the way, if I generate the mesh with version 3.0.6 I obtain a different number of nodes and tetrahedral using the same meshing options; do I have to expect this?

Yes: the algorithms have been reworked a lot, so you should expect a (slightly) different number of elements.


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

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