TBH I think this is more of a show-off of DX10 (I presume this is DX10 at least) and a lot of hard work by the gfx animators. To bad we never see realism like this in video games, only lame ATi demo videos

.
nV would rather spend their time developing new tech than making fancy show-off demo videos

This demo prolly looks even better on a G80
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