[vtkusers] cylindrical ROI

[David Gillard]

I've got vtkImageData that I'm sifting through. I'd like to be able to 
create a region of interest, preferably an elliptical cylinder.

I'm thinking of creating the region with vtkQuadric and 
vtkContourFilter, but am not certain if this is the best way to go about 
doing it. I don't know how to manipulate only the data enclosed by the 
ROI, for instance.

Any tips or suggestions would be greatly appreciated.

D.G.