[vtkusers] VOI Extraction

[Brian Rowe]

I'm trying to visualize a volume from within the Visible Human data 
set.  I'm trying to use the vtkImageReader::SetDataVOI() method.  I'm 
invoking it like this:

reader->SetDataVOI(x_start, delta_x, y_start, delta_y, z_start, z_end);

where: x_start == 568, delta_x == 1292 - 568,
	    y_start == 258, delta_y == 967 - 258,
	    z_start == 1141, z_end == 1159

These values correspond to pixel coordinates in the original image 
files.  They are all within the original image files' extents 
(2048x1216), but the slices being rendered are shifted as if these 
values are out of the valid extent.

I was wondering, does the SetDataVOI function expect pixel coordinates, 
or some other set of coordinates (perhaps camera space?).

Thanks for your time,
Brian
---
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