[Gmsh] problem with gmsh to Freefem mesh?

Thu May 7 16:24:17 CEST 2015

It’s in the GUI. You calculate your mesh and then click on Mesh > Optimize3D.
There is certainly a command for scripts but I don’t know it by heart. See the documentation…

Matthias

Von: Julien Derr [mailto:julien.derr at gmail.com]
Gesendet: Donnerstag, 7. Mai 2015 16:21
An: Zenker, Dr. Matthias
Betreff: Re: [Gmsh] problem with gmsh to Freefem mesh?

Hi Mathias, and thanks to the answer,

 How do you use this option exactly ?
Julien

On Thu, May 7, 2015 at 10:37 AM, Zenker, Dr. Matthias <Matthias.Zenker at erbe-med.com<mailto:Matthias.Zenker at erbe-med.com>> wrote:
Hi,

I didn’t run your example, but how about Mesh > Optimize3D? This has solved problems with malformed meshes for me in the past.

HTH,

Matthias

Von: Julien Derr [mailto:julien.derr at gmail.com<mailto:julien.derr at gmail.com>]
Gesendet: Mittwoch, 6. Mai 2015 14:54
An: Geordie McBain
Cc: gmsh at geuz.org<mailto:gmsh at geuz.org>
Betreff: Re: [Gmsh] problem with gmsh to Freefem mesh?

Hi Georgie,
here is a minimum example: if you run the script.sh you would get the error,
thanks a lot!
Julien

On Wed, May 6, 2015 at 2:19 AM, Geordie McBain <gdmcbain at freeshell.org<mailto:gdmcbain at freeshell.org>> wrote:
2015-05-06 2:20 GMT+10:00 Julien Derr <julien.derr at gmail.com<mailto:julien.derr at gmail.com>>:
> Hi again, I am back again with the same error message!
>
> but this time I checked that I didn't have twice the same points. He re is
> the problem:
>
>  What happen is that I have 3 points perfectly aligned, and it seems gmsh is
> making a flat triangle with them.

Hello.  I wouldn't have thought that collinearity would present a
problem, necessarily, depending on how the points are used to define
surfaces.  I wasn't sure that I'd come across this before so created a
simple degenerate quadrilateral, as attached; Gmsh & FreeFem++ seemed
happy enough.
  Or do you mean that the three points are coincident rather than
merely collinear?
  Do you have an exemplary .geo file that you could share?

I agree that having to reduce the characteristic length to avoid the
problem would be inconvenient and undesirable, but I'm hopeful that
there's another way.

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