This stuff fascinates me. Cryengine 3 (the engine behind Crysis 2) was already doing some lightweight photorealistic techniques like approximating light bounci

This stuff fascinates me. Cryengine 3 (the engine behind Crysis 2) was already doing some lightweight photorealistic techniques like approximating light bouncing around with a technique called light propagation volumes: http://www.youtube.com/watch?v=vPQ3BbuYVh8 http://www.youtube.com/watch?v=vPQ3BbuYVh8 But the OP's video is much more brute force from what I understand.