[Gmsh] Mesh file format v4

[Christophe Geuzaine]

> On 30 Aug 2018, at 13:21, Alessandro Vicini <alessandro.vicini at sitael.com> wrote:
> 
> 
> Ok, thanks.
> 
> At present, is it possible to know in advance which are the nodes not used in elements, or is it necessary to look at the elements connectivity list?

The patch has been merged - give the new automatic snapshot a try.


> 
> A.
> 
> 
> 
> -----Messaggio originale-----
> Da: Christophe Geuzaine [mailto:cgeuzaine at uliege.be] 
> Inviato: giovedì 30 agosto 2018 13:19
> A: Alessandro Vicini
> Cc: gmsh at onelab.info
> Oggetto: Re: [Gmsh] Mesh file format v4
> 
> 
> 
>> 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.
> 
> Christophe
> 
> 
>> Thanks.
>> 
>> A.
>> 
>> 
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> 
> —
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science https://urlsand.esvalabs.com/?u=http%3A%2F%2Fwww.montefiore.ulg.ac.be%2F~geuzaine&e=3f60b0be&h=b241737e&f=y&p=y
> 
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— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine

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