[Gmsh] about surface loop

[David Colignon]

As a first step, don't bother with the orientation of the surfaces, just build the "surface loop" list of surfaces 
delimiting your volume, and try to mesh the volume to see if everything is OK.
If you use the GUI to build your volume, the orientation of the surfaces is automatically accounted for.

Dave


Heye Zhang wrote:
> Hi david
> 
> thanks for your prompt reply. I am converting another file format(cmgui) 
> into geo file(gmsh). In cmgui, there is no orientation of surface. So I 
> am trying to figure out how to define the orientation for surface. To 
> lineloop, it is quite simple and the sign is determined by the 
> connecting node.
> 
> but for surfaceloop, i just do not have a clue how to define the 
> orientaion so that i can get a closed surface. It seems that in the 
> manual this has not been stated.
> 
> thanks
> 
> On Thu, Jul 23, 2009 at 7:02 PM, David Colignon 
> <David.Colignon at ulg.ac.be <mailto:David.Colignon at ulg.ac.be>> wrote:
> 
>     Hi,
> 
>     you can visualize the orientation of the surfaces (and the influence
>     of the minus sign) by putting a non-zero value in
>     Tools->Options->Geometry->Visibility->Normals box.
> 
>     idem for the mesh in Tools->Options->Mesh->Visibility->Normals
> 
>     Cheers,
> 
>     Dave
> 
>     -- 
>     David Colignon, Ph.D.
>     Collaborateur Logistique du F.R.S.-FNRS
>     CÉCI - Consortium des Équipements de Calcul Intensif
>     ACE - Applied & Computational Electromagnetics
>     Sart-Tilman B28
>     Université de Liège
>     4000 Liège - BELGIQUE
>     Tél: +32 (0)4 366 37 32
>     Fax: +32 (0)4 366 29 10
>     WWW:    http://hpc.montefiore.ulg.ac.be/
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> 
> 
> 
>     Heye Zhang wrote:
> 
>         HI there
>          I am newer to gmsh. I read the tutorial and I have a question
>         now. For line loop, there will be a sign to define the proper
>         connection. but in for volume loop how to determine whether I
>         should put a sign overthere? according to the normal of surface?
> 
>         -- 
>         Heye ZHANG
> 
> 
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> 
> 
> 
> -- 
> Heye ZHANG