[Gmsh] CAN GMsh export line information?

[Christophe Geuzaine]

Chijie Zhuang wrote:
> Dear all,
> Sorry to trouble you.
> In .msh file, gmsh does not export all line informations.  It only 
> exports some of the lines in the section of $Elements.
>  
> There are different types of elements, nodes, lines, cells... for 
> example, each triangle contains three lines, each line contains some 
> nodes. When coding discontinuous Galerkin method, it is better to get 
> all the line information. 

Gmsh does not save edge/face information at the moment. We might add 
features to do this in the future. In the meantime, generating this info 
from the data saved in a msh file is trivial: just loop over the 
elements and create the edges on the fly (e.g. by using a set of 
oriented pairs of node numbers).


> If so, once one knows a cell index, he can easily get the lines the cell 
> have, and next step, he can also get the node index.
>  
> So I wonder if gmsh itself can export all the line informations directly?
> Thank you all.
>  
> Chijie Zhuang
>  
> 
> 
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine