[Gmsh] gmsh and Plot3d interactions MISCOMMUNICATION 101

[Christophe Geuzaine]

> On 28 Dec 2020, at 01:43, Miroslav Grulovic <miro_grulovic at yahoo.com> wrote:
> 
> Hello Christophe, merry Christmas, hope you are safe.
> 
> I am sorry but appears that there is some sort of miscommunication btw us.
> Reading in and creating p3d files in GMSH  works well, bu that is not issue.
> Problem is once p3d wile is read in GMSH and then saved as NASTRAN bdf, GMSH does not recognize it as STRUCTURED mesh , thus whensame geometry previously saved as bdf is read in GMSH and tried to export as p3d, program is failing.
> 
> Issue is how to set GMSH to recognize structured mesh in NASTRAN format and then export it as p3d.
> 

That's indeed normal, as Gmsh only import/exports unstructured Nastran mesh files.

Christophe



> 
> Cheers, and stay safe. Season greetings
> 
> Miro
> 
> 
> 
> On Wednesday, December 2, 2020, 12:51:29 PM EST, Christophe Geuzaine <cgeuzaine at uliege.be> wrote:
> 
> 
> 
> 
> > On 27 Nov 2020, at 11:20, Christophe Geuzaine <cgeuzaine at uliege.be> wrote:
> > 
> > 
> > 
> >> On 26 Nov 2020, at 20:00, Miroslav Grulovic <miro_grulovic at yahoo.com> wrote:
> >> 
> >> Hello there
> >> 
> >> Ia am involved in little project using NASA PMARC14 software, and recently noticed some Plot3D capabilities which are aso build in GMSH. However I have noticed that GMSH  ( version 4.5.6 ) perfectly read p3d files and exporting them to NASTRAN format bdf, but when tried to convert very same file back to Plot3D format, error message pops up .
> >> Error reads  " Warning : No structured grid to save " and creates empty p3d file.
> >> Appears that software does not recognizes its own routine so please advise, do I am doing something wrong or software is not capable of such as transformation.
> >> 
> > 
> > Indeed, currently when we read structured meshes we import them as general unstructured grids.
> 
> Well actually I was wrong, and we do actually already keep track of the structured information in the reader.
> 
> To test:
> 
> // create p3d file
> gmsh benchmarks/3d/sphere_in_cube_hexa.geo -3 -o a.p3d
> 
> // read it back and save it again
> gmsh a.p3d -save -o b.p3d
> 
> Works fine with the latest Gmsh.
> 
> Christophe
> 
> 
> > The P3D reader could be changed to keep track of the structured information. Maybe open an issue on the gitlab to keep track of this feature request?
> > 
> > Christophe
> > 
> > 
> >> Cheers thanks for response and stay safe.
> >> 
> >> 
> >> Miro  
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> > 
> > — 
> > Prof. Christophe Geuzaine
> > University of Liege, Electrical Engineering and Computer Science 
> > http://people.montefiore.ulg.ac.be/geuzaine
> 
> > 
> > 
> > 
> > 
> > 
> > _______________________________________________
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> 
> — 
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science 
> http://people.montefiore.ulg.ac.be/geuzaine
> 
> 
> 
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— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://people.montefiore.ulg.ac.be/geuzaine