[Gmsh] R: Mesh file format v4

[Alessandro Vicini]

Ok, just tried it. What I get is:

1) From tools->statistics: 24122 Nodes, 124740 elements

2) In mesh file V2: 22689 nodes, 147030 elements

3) In mesh file V4: 24092 nodes, 147030 elements.

The number of elements is ok (the one in the mesh file includes elements of type 2), but there are still perhaps some inconsistencies in the number of nodes...?



-----Messaggio originale-----
Da: Christophe Geuzaine [mailto:cgeuzaine at uliege.be] 
Inviato: giovedì 30 agosto 2018 14:44
A: Alessandro Vicini
Cc: gmsh at onelab.info
Oggetto: Re: [Gmsh] Mesh file format v4



> 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 
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> 2F~geuzaine&e=3f60b0be&h=b241737e&f=y&p=y
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