[Gmsh] Triangles in .msh file

[Zenker, Dr. Matthias]

Hi,

I dont' know the answer to your question, but here is what you can do to find it out:
Open your msh file with a text editor and delete all tetrahedrons manually. Don't forget to adjust the number of entities accordingly. When you open the file with gmsh, I think you will see immediately where the triangles are.

HTH,

Matthias

-----Ursprüngliche Nachricht-----
Von: Gmsh User [mailto:amrit_pou at hotmail.com] 
Gesendet: Donnerstag, 5. Mai 2011 04:53
An: gmsh at geuz.org
Betreff: Re: [Gmsh] Triangles in .msh file

mianzhi <wangmianzhi1 at ...> writes:

> 
> Hello,
> Hopefully my answer would be helpful.
> 1. All Tri.s are on the boundary.
> 2. The 2nd "tag" of each Tri., the "geometric entity", tells you which 
> boundary surface the Tri. belongs to.
> (find "number-of-tags" on this page
> http://geuz.org/gmsh/doc/texinfo/gmsh.html ) 3. You may see the 
> "geometric entity index" of all boundary surfaces in gui of gmsh via 
> enabling "Tools/Options/Geometry/Surface numbers".
> 
> Mianzhi


I think I am not understanding what you meant my Tri.s . Is this an operator or something?

Could you clarify what you meant by that? 

Just to give you more info about what I am actually doing, after I finish meshing a geometry, I save the mesh in .msh file format and export it to MATLAB.
This is the only file I have, and this file clearly contains nodal numbers and coordinates of bunch of triangles along with that of points, lines and tetrahedrons. I need nodal numbers and coordinates of SURFACE TRIANGLES ONLY, and my question was whether the triangles appearing in .msh file are indeed the SURFACE TRIANGLES ONLY. 

I am sorry if this is what you meant, but a clarification would certainly help.

Thanks for replying!

~Gmsh User