[vtkusers] Vtk Data

[Zhizhong Zhang]

Hi, my name is Mike and I just started using VTK and
just joined the mailing list. I have a question I hope
somebody can answer. 

I wonder if there is document on the data sets. I 
am using the data 'headsq', but I don't understand 
the data. For example, why is it that I should set the
data dimension to 64x64?  When I read the examples,
I come across the vtkPiecewiseFunction where the
certain points (8 points) are set. Why are they set
in that way, etc. I suppose that its determined by the
dataset itself. But how do I find the information on
them, so that when I will be able to use other
datasets? I know my question may be naive, but I 
searched the vtk site and I didn't find an answer. 
Thank you!
Best,
Mike

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