[vtkusers] Wrong extent after SetInput

[Benjamin King]

Hi,

I'm doing some volume rendering and the source for the mapper is a 
vtkImageCast object. When my program is started, vtkImageCast has a 
generated volume (built with vtkImageEllipsoidSources, 
vtkImageMathematics and vtkImageGaussianSmooth) as its input.
The user can load a volume from disk (using a vtkImageReader2). When I 
change the input of the vtkImageCast to this reader, the extent from the 
old volume is kept. Thus the mapper draws only a portion of the input.

If I destroy the mapper and generate a new one after the input to 
vtkImageCast changed, all works as expected.

This problem has been mentioned by a few people on the list, but I 
couldn't find an answer.

thanks for your help,
   Benjamin King

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