What makes you think GPUs are suitable for the problem? What does their global illumination model look like, and what are the limiting factors here? (I have ab

What makes you think GPUs are suitable for the problem? What does their global illumination model look like, and what are the limiting factors here? (I have absolutely no idea, and the advert..cougharticle is light on technical content, but the fact that they didn't use them makes me suspect they couldn't use them.)