[Gmsh] Identifying nodes on boundaries and their order

[Melanie Roberts]

Thanks Oliver for the solution, and taking the time to explain how the 
earlier does answer my problem.  Much appreciated! 

Melanie



From:   Oliver <oliver.willekens at gmail.com>
To:     Melanie Roberts/Australia/IBM at IBMAU
Cc:     gmsh at geuz.org
Date:   21/09/14 12:55 AM
Subject:        Re: [Gmsh] Identifying nodes on boundaries and their order



Actually, that solution does solve your problem. Gmsh by itself does not 
have that functionality, but it does provide the facilities with which you 
could extract those things easily (post-processing the generated mesh). 
Just label the boundaries as 'Physical Line' (in your case, for others it 
might be Physical Surfaces). Then, when the mesh is generated, extract all 
lines that have the id you assigned to this collection of physical lines. 
You'll end up with a list of all the boundary nodes. 
Not sure what the program you're using means by "list in order", so I 
can't help you there.
Kind regards, 
Oliver.
Op 20 sep. 2014 11:31 schreef "Melanie Roberts" <
melanie.roberts at au1.ibm.com> het volgende:
Hi, 

In order to use my gMSh generated mesh in another program I need to list, 
in order, the nodes that make up the various boundaries of the domain - is 
there a way to do this in gMSh? 

as an example, I have the mesh 

and want to be able to extract that one boundary segment is 1 - 8 - 2 -3, 
a second is 3-4-5, a third 5 - 6 - 7 and the final 7 - 9 - 1.  If I were 
to have a single list that loops around the entire shape I can manually 
split into the various segments without any problem. 



I found this http://www.geuz.org/pipermail/gmsh/2014/009188.html in the 
archive - but I do not think this answer my problem 

Thanks 

Melanie
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