>>> Also they use a global illumination system.
>>
>> No, they don't.
>>
>> According to Wikipedia, they use "occlusion mapping", which is a 
>> comparatively cheap way to fake global illumination.
> 
> Well yes of course it is faked (like almost every other GPU effect), I 
> wasn't expecting them to have invented a way to do physically correct 
> per-pixel global illumination in real-time!  I just meant they were at 
> least attempting to have some GI effect, not simply ignoring it as most 
> games do.

Most games just precompute GI. (Usually at too low resolution...)

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