[Gmsh] About tags.
cgeuzaine at ulg.ac.be
Fri Jun 22 10:03:31 CEST 2007
Cécile Giorla wrote:
> I have a question about how we can tag elements in GMSH.
> In my case, I create surface elements with extrusion (in z direction)
> from various ground surfaces (creating buildings).
> So I can not control the number of the elementary geometrical entity for
> this surfaces.
Since Gmsh 2.0.7 you can retrieve the "lateral" surface ids from the
list returned by extrusion commands. Would that solve the problem?
> I control the number of the physical entity by assigning the same number
> for all the elements of the ground and the surfaces created. (the ground
> AND the buildings' surfaces then are a unique surface).
> But I need to keep an information about from which ground surface a
> building is created. I know GMSH has information about mesh partition,
> but how can I assign this number?
> Or maybe there is a way in GMSH to assign user defined tag when we
> create elements (other than the physical number)?
> Thank you.
> Cecile Giorla.
I'm not sure I understand your question... Couldn't you just label the
surfaces with *multiple* physical tags?
(Patition numbers are designed to assign tags "element-by-element",
disregarding any elementary or physical geometrical entities.)
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Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science