[vtkusers] Converting PolyData into ImageData

[Michael Györffy]

Hello:

I have Polydata. Can save it using PolyDataWriter.

I would like to save it with PNMWriter, but I think I have to convert my
PolyData into ImageData. How do I do this?

Also, along a similar vein, I would like slice up my PolyData and save the
sections as TIFFs. I understand how to use ImageReslice, but it requires
ImageData which I don't have.

Any help or clues would be much appreciated.

Thank you,

Mike