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

[Matthew Knepley]

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/>
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