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Matteo Semplice <matteo.sempl...@uninsubria.it> writes:
>> The way that periodic coordinates work is that it stores a DG >> coordinate field by cell. Faces default back to the vertices. You >> could think about also putting DG coordinates on faces, but no one >> had asked, and it is potentially expensive. >> >> If you really need them to keep going, face coordinates can be >> extracted from cell coordinates. Otherwise, I can do it after the >> PETSc Meeting. Or, we are happy to take contributions adding this. > > Hi. > > I mainly wanted to check that this was expected and not a result of a > setup of my DM. No need to change Petsc now except maybe issuing a > warning if the fallback to continuous coordinates will give wrong > results. As for my code, I think I can extract the info from the cell > coordinates in a pre-processing phase and if this crazy FV methods I am > implementing will survive for long enough, I'll think about contributing. You can also check out the "isoperiodic" example (src/dm/impls/plex/tests/ex49.c) if you want the semantic that donor and image points are separate points that map to the same global dofs. This avoids having any "DG coordinate field".
