[vtkusers] vtkImagePermute without copying the data

[John Biddiscombe]

> > Hi there.  Would anybody out there have a class that does the same
> > thing vtkImagePermute does, but that only changes the attributes
> > (extents,dimensions,etc.) and references the input data for it's own?
>
>This isn't possible.  You can't rearrange the x,y,z of vtkImageData
>without re-ordering the data in memory.

 >I'm building a viewer with 3 views for each data set (x,y,z) and the

The only likely solution would be to redo the mappers (one for each axis) 
such that they display data in a different order (like copy it to 
textures). its just about conceivable if you were creating textures in 
graphics memory and not user memory - then you could get away with one copy 
of the raw data and N copies of "rendered" stuff.  Not sure I've thought 
this through properly...hmmm