[petsc-users] [Gmsh] Access both default sets and region names

[Noam T.]

There could be some overlapping/redundancy between the default and the user-defined groups, so perhaps that was the intended behavior. Glad to hear it's possible to have access to everything.

Thanks,
Noam
On Thursday, January 11th, 2024 at 6:31 PM, Matthew Knepley <knepley at gmail.com> wrote:

> On Thu, Jan 11, 2024 at 11:59 AM Noam T. <dontbugthedevs at proton.me> wrote:
>
>> Without using the flag -dm_plex_gmsh_use_regions, the DMGetNumLabels says there are 5, named celltype, depth, cell/face/vertex sets.
>> With the flag, the labels are celltype, depth, my_vol, my_surface (using the same example as before).
>> Am I misusing the flag somehow, and I should be able to access those of cell/face/vertex as well?
>
> Shoot, yes this changed after another request. Yes, we can put in a flag for that. Should not take long.
>
> Thanks,
>
> Matt
>
>> PS: Using PETSc 3.20.3
>>
>> Thanks,
>> Noam
>> On Thursday, January 11th, 2024 at 5:28 PM, Matthew Knepley <knepley at gmail.com> wrote:
>>
>>> On Thu, Jan 11, 2024 at 11:18 AM Noam T. via petsc-users <petsc-users at mcs.anl.gov> wrote:
>>>
>>>> Would it be feasible to have an option (e.g. new flag along the lines of -dm_plex_gmsh_...) that allows the user to access both the default sets (Cell / Face / Vertex) together with user-defined gorups (those under $PhysicalNames, available when using -dm_plex_gmsh_use_regions)?
>>>
>>> I am not sure I understand the question. When you turn on regions, it makes extra labels, but the generic labels still exist.
>>>
>>> Thanks,
>>>
>>> Matt
>>>
>>>> That is, with a *.msh file containing
>>>>
>>>> $PhysicalNames
>>>> 2
>>>> 2 100 "my_surface"
>>>> 3 200 "my_vol"
>>>>
>>>> the return of DMGetLabelName(dm, n, name) would be (order may differ)
>>>>
>>>> n = 0, name = "celltype"
>>>> n = 1, name = "depth"
>>>> n = 2, name = "Cell Sets"
>>>> n = 3, name = "my_vol"
>>>> n = 4, name = "Face Sets"
>>>> n = 5, name = "my_surface"
>>>> ...
>>>>
>>>> I poked into src/dm/impls/plex/plexgmsh.c and have managed to print all the labels after changing a couple of variable values, so perhaps it is doable.
>>>> The changes made are not a solution, simply naively set some variables to skip checking for the use_regions flag, so it understandably crashes soon after.
>>>>
>>>> Thanks, Noam
>>>
>>> --
>>>
>>> What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
>>> -- Norbert Wiener
>>>
>>> [https://www.cse.buffalo.edu/~knepley/](http://www.cse.buffalo.edu/~knepley/)
>
> --
>
> What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.
> -- Norbert Wiener
>
> [https://www.cse.buffalo.edu/~knepley/](http://www.cse.buffalo.edu/~knepley/)
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