>>> Oh yeah, and "Smoke". Simple little demo, but I have *no clue* how it 
>>> manages to do that in realtime...
>>
>> Using the GPU...  the GPU is good for doing that sort of thing.
>
> I'm still mystified (get it?) as to how it manages to render with 
> absolutely no visible grain of any kind to it. Even POV-Ray struggles to 
> do that given many *days* of rendering time...
>
> Clearly some kind of trick must be involved.

Not really, just utilising the GPU's ability to handle 3D textures and 
smooth blending really efficiently.  Don't forget the GPU version is not 
scattering light like POV does...

This links shows some details about a DX10 smoke simulation, I expect a DX9 
version uses a similar method (probably just not as efficient).

http://developer.download.nvidia.com/presentations/2007/gdc/RealTimeFluids.pdf

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