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if you are interested in rendering, don't miss out John's talk at 5pm dallas time today: "Principles of Lightining and Rendering with John Carmack" http://www.quakecon.org/event-schedule/ Should also be streamed on the quakecon twitch stream. according to the keynet video, it is supposed to be a talk he has given internally at id before and was urged to redo it at quakecon.

"John will present a lecture-style presentation on the physics of light transport and rendering. He will discuss how light behaves in the real world, and the approximations and compromises that are involved in simulating the behavior with computers. Note: not for the technically faint at heart."