[vtkusers] Image Extents: What's the difference?

[Volpe, Christopher R (CRD)]

Can anyone shed some light on the difference between "GetExtent()" and "GetWholeExtent()" in a
vtkImageData? Particularly as it applies to the *input* ImageData in a filter. Note that in
vtkImageGradient there is the seemingly self-contradictory code fragment:
  wholeExtent = inData->GetExtent();

thanks,
Chris
> g GE Corporate Research & Development 
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Christopher R. Volpe
Computer Scientist
Visual Information Program
Bldg KW, Room C215
P.O. Box 8, Schenectady, NY 12301

(518) 387-7766, Dial Comm: 8*833-7766, Fax: (518) 387-6981
e-mail: volpecr at crd.ge.com    web: http://www.crd.ge.com/~volpecr