The VolVis link off that page also has related images.
http://www.cs.sunysb.edu/~vislab/volvis_home.html

So the steps are

Generate the matrix in POV via a 3d render.
Encode the matrix with compression.
View the Matrix from any point.

No fancy lighting of the Volume is required as the original 3d render will 
supply this data. A good radiosity render should be a "fun" object to look 
at.

Daniel Matthews wrote:

> Yes! Thank you, that hint + google.com gave me this link
> 
> http://www.acm.org/jgt/papers/KarabassiEtAl99b/
> 
> 
> Dave Dunn wrote:
> 
>> Could this be what you are looking for?
>> 
>>  A Fast Depth-Buffer-Based Voxelization Algorithm

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