[vtkusers] extract volume part

[EvilMax]

I'll try, don't warry. :)

To extract part of the volume and render it like new one in separate window
just use vtkExtractVOI class. It will produce new vtkImageData containing
specified VOI. Look on VTK example - it does the thing.

Cons: you can extract cubic VOI with sides parallel to axes. If you want
ability to extract any VOI, you must implement it by yourself.

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