[petsc-dev] VTK viewer design question

[Patrick Sanan]

I'm looking at the VTK viewer implementation  and I notice that
PetscViewerVTKAddField() [1]
accepts a parameter which, despite being called "dm", is of type
PetscObject.

I think that this is used, amongst other things, to ensure that vectors
being queued up to be written all come from the same DM.

I'd like to relax this to only require that the vectors all come from
*compatible* DMDAs, but this would require the DM API in vtkv.c.

My questions: is this argument of type PetscObject for any reason other
than not wanting to bother including petscdm.h ? Might this be something
other than a DM in some case (and in which case, why is the argument called
"dm")? Am I missing a reason that I'll get into trouble eventually if I
change this?

(Similar question for the "vec" argument).

[1] http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Viewer/
PetscViewerVTKAddField.html
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