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

[Matthew Knepley]

On Thu, Jan 11, 2024 at 12:53 PM Noam T. <dontbugthedevs at proton.me> wrote:

> 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.
>

Here is the MR: https://gitlab.com/petsc/petsc/-/merge_requests/7178

If you build that branch, you can use -dm_plex_gmsh_use_generic to turn on
those labels.

  Thanks,

     Matt


> 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/>
>
>
>

-- 
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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