[Gmsh] gmsh slow at drawing

Guido Giuntoli giuntoli1991 at gmail.com
Tue Aug 2 02:57:15 CEST 2016

Dear German, thank you very much for you quick answer, this post shows an
interesting tool and we can take advantage of that. Our idea is to use
another code that we are developing for solving the neutron diffusion
problem with the partitioning domain technique (and SPMD parallel
philosophy) in order to solve with very high performance. We need the 20
different Physical Entities across the Z axis to compare results with PCE2c
and to have a ".geo" file that describes all the domain neutron features
(we have different code philosophies...in our case all the neutron features
have to be in a .geo we don't like to specify that to the code by hand ). I
will send the .geo tomorrow,  it has approximately 100000 lines (minimum)
of geometry definition, I think this is our gmsh performance
problem...Thanks again, Guido.

2016-08-01 8:15 GMT-03:00 German Theler <gtheler at seamplex.com>:

> Hi Guido
> You did not share the geo file so we cannot tell much. Nevertheless, if
> you want to use milonga with this mesh and extrude 20 times each
> individual channel, you are missing the design basis of the code. Each
> channel is a single physical entity, not twenty different ones.
> On the other hand, I think you may get a better performance by
> generating the geometry in FreeCAD using its Python interface, then
> connecting the solids to obtain a CompSolid (perhaps Bernd can help you
> better than myself) and then finally mesh in Gmsh.
> See the post that coincidentally Bernd shared last week:
> http://forum.freecadweb.org/viewtopic.php?f=18&t=16750&p=132256
> On Wed, 2016-07-27 at 12:30 +0000, Giuntoli Guido Alfredo wrote:
> > Hi ! I want to extrude a surface like “geometry.jpg”. The problem is
> > that when I extrude and open the GUI interface, gmsh becomes very slow
> > drawing the 3D geometry (in “geometry1.jpg” I extruded some of these
> > surface elements). I think that the problem here is the huge quantity
> > of definitions that are in the .geo file. As you can see in the figure
> > “geometry.jpg” each quadrilateral is a different physical entity. What
> > can I do to solve my problem ? I mean, draw the geometry in a
> > reasonable time  (in my case each quadrilateral should be extruded 20
> > times because I should define different phisical entities in the z
> > axis.
> >
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