[vtkusers] visualize a 3d matrix?

[TheSaint 555]

Im new to VTK and have a few questions before I start using it.

I have an NxNxN matrix (N typically being 15-30). Each element is in the 
range [0-3]. I would like to visualize the matrix as a collection of NxNxN 
little cubes each colored only if the value is non zero (and be able to 
rotate it with the mouse). I would like the zero-values elements to be fully 
transparent. What is the easiest way to do this in VTK? Is there already a 
class that implements this?

I would like to also be able to slice the matrix arbitrarily along the axes 
and view the intersection of the elements with the cross section plane.

And is there an easy way to generate postscript of these image?

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