On Fri, Mar 14, 2025 at 12:15 PM Preda Silvia via petsc-users < petsc-users@mcs.anl.gov> wrote:
> Hi, > > > > We are having a hard time understanding how the degrees of freedom are > projected after a dmforest adaption. Having used before the P4EST library > directly, we recall that there, a index mapping from quadrants present in > the grid before and after adaption (1 to 1, 1 to many, many to 1, for > unaltered, refined, coarsened quadrants, respectively) was available. Would > it be possible to access the same information for a dmforest? > > > > Thank you for all the suggestion! > I do not understand exactly what you want yet. A projection of the dofs would necessarily depend on the function space you are using to represent the field. So you might instead be asking, can I get the refinement pattern like the parent of a given cell. You can get this https://urldefense.us/v3/__https://petsc.org/main/manualpages/DMPlex/DMPlexGetTreeParent/__;!!G_uCfscf7eWS!aAk0LSbDAPHyCjCzQ3Fa3FjQxqV-5Cx8PkJvYW2BWAfdWeBJcXe9U9MriWyHncDo0mnS_NKfIJJCq7vFlz-x$ There are few users (except us), so we would be happy to listen to interface suggestions. I will also note that Toby is the expert, and I am an amateur. Thanks, Matt > Silvia > -- 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://urldefense.us/v3/__https://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!aAk0LSbDAPHyCjCzQ3Fa3FjQxqV-5Cx8PkJvYW2BWAfdWeBJcXe9U9MriWyHncDo0mnS_NKfIJJCq_i0Ymri$ <https://urldefense.us/v3/__http://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!aAk0LSbDAPHyCjCzQ3Fa3FjQxqV-5Cx8PkJvYW2BWAfdWeBJcXe9U9MriWyHncDo0mnS_NKfIJJCq5ohAd9A$ >
