[Gmsh] Structured surface meshes and export to XYZ or structured CGNS

[Guillaume Florent]

Hi Christophe,

Thanks for your crystal clear answer. Its leaves the options either 
create a converter from the current Plot3d P3D export (to plot3D XYZ) or 
to help with the CGNS structured export...

Cheers,

Guillaume

Le 21/01/2020 à 14:24, Christophe Geuzaine a écrit :
> Hi Guillaume,
>
> Indeed Gmsh handles most (if not all) meshes as unstructured. Our new CGNS importer now handles structured meshes as input ; but the exporter still currently exports even structured meshes as unstructured. We plan to add simple structured CGNS grids for our transfinite meshes - but it's not done yet. Any help with this would actually be welcome.
>
> Best,
>
> Christophe
>
>
>> On 16 Jan 2020, at 10:59, Guillaume Florent <florentsailing at gmail.com> wrote:
>>
>> Hello,
>>
>> This is my first message on the mailing list, so please apologize any wandering off the Gmsh community culture ...
>>
>> I want to create a structured/block-structured (obviously quads) surface mesh and export it to either Plot3D XYZ format or to CGNS structured format to use it as an input for another hyperbolic mesher.
>>
>> Starting with a simple cube, I realized that:
>>
>> - I could not find an exporter to Plot3D XYZ format (I yet have to see if the P3D export format can be converted to XYZ)
>>
>> - even for a simple transfinite surface mesh on a cube face, I get an unstructured CGNS mesh when exported ('Unstructured' is in plain text in the exported file and the hyperbolic mesher complains about that since it expects a structured mesh).
>>
>> Am I missing something or hitting a Gmsh limit?
>>
>> Best regards,
>>
>> Guillaume Florent (Yacht Design + Engineering)
>>
>>
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> —
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science
> http://www.montefiore.ulg.ac.be/~geuzaine
>
>
>