[vtkusers] VOI Extraction

[Amy Henderson]

Hi Brian,

The parameters you pass to SetDataVOI should be the minimum and maximum 
pixel value in each dimension, not the minimum and an offset. The example 
you listed would then be:
reader->SetDataVOI(x_start, x_end, y_start, y_end, z_start, z_end);
where: x_start == 568, x_end == 1292,
          y_start == 258, y_end == 967,
          z_start == 1141, z_end == 1159

- Amy

At 04:40 PM 4/21/2004, Brian Rowe wrote:
>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
>---
>1.79 x 10^12 furlongs per fortnight -- it's not just a good idea, it's the 
>law!
>
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