[petsc-users] What exactly goes into DMPlexSetRefinementLimit

[Justin Chang]

When I enter values  like 1/16, 1/12, 1/24, and so on, I was expecting to
get roughly the same dm object as if I simply did -dm_refine <0/1/2/3>.
Instead it seems I get highly unstructured grids, and the smaller the
number gets, the fewer additional cells I get. Is there a way to make the
refinement limit uniform?

On Wed, Aug 17, 2016 at 9:38 AM, Matthew Knepley <knepley at gmail.com> wrote:

> On Wed, Aug 17, 2016 at 5:23 AM, Justin Chang <jychang48 at gmail.com> wrote:
>
>> Hi all,
>>
>> Playing around with SNES ex12.c and I am attempting to tinker around with
>> 3D options. I am trying to understand what kind of values go into
>> -refinement_limit for 3D simplices.
>>
>
> The cell volume limits for any cells created out of the existing cells.
> This is how TetGen understands refinement. I think a
> better way is to use a metric tensor field, and we now have an interface
> to pragmatic for this (I think currently I only hooked it up
> to DMCoarsen() but it does both). Clearly the interface is immature, but
> this is the way we are headed.
>
>   Matt
>
>
>> Thanks,
>> Justin
>>
>
>
>
> --
> 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
>
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