[vtkusers] extracting a volume of interest

[Shiva Bissoon]

Hi Prabhu and others,
I was wondering if you may be able to give some advice and perhaps see my 
problems.I am trying to extract a vloume of interest, i.e. the plane where 
the particles intersect the plane.However, it runs the error that it cannot 
convert a vtkPolydata type to vtkStructedGrid...
Attached is the code in tcl.Could you give it a try and see if you could 
sopt what is wrong and perhaps how I might go about changing the 
code.thanks,
Shiva
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