[Paraview] Is there any point to compiling with MPI but without offscreen rendering?

[Cook, Rich]

We have large clusters and some of them have graphics cards on them.  Most don't.  So normally I expect to be using -DVTK_USE_OFFSCREEN:BOOL=ON   -DPARAVIEW_USE_MPI:BOOL=ON with cmake.  
I got to thinking.  First, if I compile with -DVTK_USE_OFFSCREEN:BOOL=ON then why do I have to use --use-offscreen-rendering to launch the pvservers.  Secondly, can pvservers render to graphics cards for distributed rendering under MPI?  If so, does it make sense to do -DVTK_USE_OFFSCREEN:BOOL=OFF   -DPARAVIEW_USE_MPI:BOOL=ON ?? 

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✐Richard Cook   
✇ Lawrence Livermore National Laboratory
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Information Management & Graphics Grp., Services & Development Div., Integrated Computing & Communications Dept.
(opinions expressed herein are mine and not those of LLNL)