[vtkusers] how to access 3D volume

[Michnay Balázs]

Dear Ravi,

Here's how you can access a slice of a volume:

vtkExtractVOI *sliceExtractor = vtkExtractVOI::New();
sliceExtractor->SetInput(volume);
sliceExtractor->SetVOI
(xmin,xmax,ymin,ymax,frameNumber,frameNumber);

where both xmin and ymin should be 0, xmax and ymax should be the 
size of the frame.
frameNumber is the number of frame you'd like to extract.

The extracted image data can then be accessed by calling:

sliceExtractor->GetOutput();

Best of all,

 Michnay

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