[vtkusers] VTK MPI examples test promble

[Yu Kang]

Hi every
I have four machines (node1-node4) installed mpich1.2.7 and have passed
"cpi"test programme.
When I try the vtk parallel processing example ParallelIso.cxx I get try
troubles.
I run the command
"mpirun -np 1 ParallelIso" the result is correct

BUT when I run
"mpirun -np 2 ParallelIso" I get these error message

ERROR: In /usr/local/vtk/IO/vtkImageReader2.cxx, line 531
vtkImageReader (0x9109790): Initialize: Could not open file
../../../../VTKData/Data/headsq/quarter.46

and only half part of images are rendered in the windows, when 3 nodes take
in part only one third part are rendered
I think this may be vtkdata sharing promble but I don't know how to sovle
it.
My VTK_DATA_ROOT=/home/mpiuser/prog_mirror/vtkdata witch is NFS share disk
between node1-4
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