[Gmsh] Strange behavior meshing / exporting

[Andreas Puettmann]

Thanks for your answers.

Yes, the batch mode seems to use the same random seed, when it is called 
multiple times in a row. But the seed (also for the batch mode) changes, 
when the GUI is started.
Is that intended?

Best regards
Andreas


On 05/03/2011 09:55 AM, Andreas Puettmann wrote:
>
>
> On 05/03/2011 01:26 AM, Geordie McBain wrote:
>> Hello.  I believe Gmsh's meshing algorithms are random, so even
>> repeating identically the meshing and saving options might give you a
>> different mesh.
>
> Ah OK, thank you for your hints. I noticed now that indeed none of the 
> results I sent is deterministic.
>
> However, I can reproduce the exact same .msh file when I do not use 
> the GUI but run the mesher in batch mode:
> $ gmsh -3 column.geo
>
> The console output tells me that in both cases (GUI and batch) the 
> same (?) Delaunay algorithm is used. So why does the GUI based 
> approach include a random element, while the batch mode obviously does 
> not? What is the difference between them? Maybe one of the developers 
> can shed some light on that?
>
> Andreas
>

-- 
Dipl.-Ing. Andreas Puettmann

German Research School for
Simulation Sciences GmbH
c/o Institute of Bio- and Geosciences 1
52425 Jülich | Germany

Tel +49 2461 61 5541
Fax +49 2461 61 3870
Web www.grs-sim.de

Members: Forschungszentrum Jülich GmbH | RWTH Aachen University
Registered in the commercial register of the local court of
Düren (Amtsgericht Düren) under registration number HRB 5268
Registered office: Jülich
Executive board: Prof. Marek Behr, Ph.D | Dr. Norbert Drewes