Alain wrote:

> It's looks like it's based on tubes. You travel a tube and it encounters 
> other tubes at various angles. Any triangle that is inside any tube is 
> removed. All edges are smoothed, a little like for a blob.

Yeah, but it looks a little more complex than that. There are large 
chambers that don't appear to be "tube-like", and there are passages 
that aren't quite circular, and so on. (Maybe the tube diammeter varies 
or something?)

Well anyway, it looks like it could be *awesom* with true 
light-sourcing, global illumination, and maybe some volumetric light 
scattering. ;-)

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