[Gmsh] about surface loop

[Heye Zhang]

Hi david

thanks again.

cheers
On Thu, Jul 23, 2009 at 9:04 PM, David Colignon <David.Colignon at ulg.ac.be>wrote:

> 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/
>>    Agenda:
>>    http://www.google.com/calendar/embed?src=david.colignon%40gmail.com
>>
>>
>>
>>    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
>>
>
>


-- 
Heye ZHANG
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