[petsc-users] GMSH entities

[Adrian Croucher]

hi Matt,

On 15/05/24 6:05 am, Matthew Knepley wrote:
> On Tue, May 14, 2024 at 9:07 AM Matthew Knepley <knepley at gmail.com> wrote:
>
>     On Mon, May 13, 2024 at 10:04 PM Adrian Croucher
>     <a.croucher at auckland.ac.nz> wrote:
>
>         On 14/05/24 1:44 pm, Matthew Knepley wrote:
>
>>         I wish GMsh was clearer about what is optional:
>>         https://urldefense.us/v3/__https://gmsh.info/doc/texinfo/gmsh.html*MSH-file-format__;Iw!!G_uCfscf7eWS!dbZ8R9PicaYRx4Y2IkPxvCoLlJ4lpsMbIAFBKbKZK5h5-2OTX5Ne-AwgOBHv2mJaHqg9uo5orDQYs2PaoAcpDmS65Au1g9uw$ 
>>         <https://urldefense.us/v3/__https://gmsh.info/doc/texinfo/gmsh.html*MSH-file-format__;Iw!!G_uCfscf7eWS!dbZ8R9PicaYRx4Y2IkPxvCoLlJ4lpsMbIAFBKbKZK5h5-2OTX5Ne-AwgOBHv2mJaHqg9uo5orDQYs2PaoAcpDmS65Au1g9uw$ >
>>
>>         They do talk about it, but not exhaustively. GMsh always
>>         writes and $Entities block from what I can tell.
>>         I can make it optional, it just might take until after the
>>         PETSc Meeting.
>
>         Looks like $Entities are optional:
>
>         https://urldefense.us/v3/__https://gitlab.onelab.info/gmsh/gmsh/-/commit/b5feba2af57181ffa946d3f0c494b014603c6efa__;!!G_uCfscf7eWS!dbZ8R9PicaYRx4Y2IkPxvCoLlJ4lpsMbIAFBKbKZK5h5-2OTX5Ne-AwgOBHv2mJaHqg9uo5orDQYs2PaoAcpDmS65ISaNx6E$ 
>         <https://urldefense.us/v3/__https://gitlab.onelab.info/gmsh/gmsh/-/commit/b5feba2af57181ffa946d3f0c494b014603c6efa__;!!G_uCfscf7eWS!dbZ8R9PicaYRx4Y2IkPxvCoLlJ4lpsMbIAFBKbKZK5h5-2OTX5Ne-AwgOBHv2mJaHqg9uo5orDQYs2PaoAcpDmS65ISaNx6E$ >
>
>         I can also load a GMSH 4.1 file without $Entities into GMSH
>         itself and it doesn't complain, suggesting that they are
>         indeed optional.
>
>     Yes, but they are not careful to specify when a file can be
>     inconsistent. For instance, omitting the $Entities, but then
>     specifying entity numbers in the $Nodes block. I think they also
>     thought this was inconsistent, but then got user complaints. The
>     minimal example they show does exactly this.
>
>         If the $Entities aren't strictly needed for anything in DMPlex
>         (which I'm guessing they aren't, as the GMSH file format 2.2
>         doesn't even have them) then it would be useful not to require
>         them.
>
>     I put in some code for this:
>     https://urldefense.us/v3/__https://gitlab.com/petsc/petsc/-/merge_requests/7546__;!!G_uCfscf7eWS!dbZ8R9PicaYRx4Y2IkPxvCoLlJ4lpsMbIAFBKbKZK5h5-2OTX5Ne-AwgOBHv2mJaHqg9uo5orDQYs2PaoAcpDmS65MnfH9Hr$ 
>     <https://urldefense.us/v3/__https://gitlab.com/petsc/petsc/-/merge_requests/7546__;!!G_uCfscf7eWS!dbZ8R9PicaYRx4Y2IkPxvCoLlJ4lpsMbIAFBKbKZK5h5-2OTX5Ne-AwgOBHv2mJaHqg9uo5orDQYs2PaoAcpDmS65MnfH9Hr$ >
>
>     It just ignores entity numbers when there is no section.
>
>
> This merged, so now it should be fixed for you.

Thanks, that seems to fix the problem. Great!

Cheers, Adrian

-- 
Dr Adrian Croucher
Senior Research Fellow
Department of Engineering Science
Waipapa Taumata Rau / University of Auckland, New Zealand
email:a.croucher at auckland.ac.nz
tel: +64 (0)9 923 4611
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