Mental Ray & Global Illuminasion

Today when i got home i read about information on how to use Mental ray. One thing that i found it interesting is that with Mental Ray (MR) it can produce and reflect colors off surfaces. and MR works along side with GI (Global Illumination). It was good to see the effects and the good lighting it can produce. the shadows the colors and lights bouncing off surfaces. well yeah, here is the link to how its done =D

http://toi.bk.tudelft.nl/toi-pedia/index.php?title=Mental_Ray_Physical_Sky_tutorial