Very cool demo, I just can't get enough of it. It keeps amazing me that GPUs are capable of rendering cinema quality raytraced graphics. The image clears very fast on a GTX 480 at full screen resolution: http://www.youtube.com/watch?v=nEXeTXmCfdE
The OptiX team did a really great job with this. I hope they will build upon it, using more advanced algorithms like bidirectional pathtracing, Metropolis light transport or even stochastic progressive photon mapping, a combination of these three would probably be the ideal solution, which could handle 99.9% of lighting situations in a robust and efficient manner. The stochastic progressive photon mapping algorithm (SPPM), invented by Toshiya Hachisuka and Henrik Wann Jensen is ideally suited for GPU adaptation: it's progressive, consumes very little memory compared to normal photon mapping and can render effects like DOF and motion blur (and of course caustics). In fact there already is a working downloadable GPU version of it (not CUDA, but GLSL): available at http://graphics.ucsd.edu/~toshiya/gpusppm.zip, which hits 40 million photons per second on a HD4870. SPPM is also not biased in the way that photon mapping is, but it's more similar to unbiased algorithms: because SPPM is progressive, it will "eventually" converge to the correct solution (just like path tracing, bidirectional path tracing and Metropolis light transport).
Returning to the Design Garage demo, I can't wait to see what they're cooking for Fermi2/GTX500.
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