Just an FYI to the folks who are interested: Christoph's radiosity fixes
have been integrated and see to work very well. A hearty 'thanks' to him
for this! I intend to do a release in the next day or two that incorporates
the new code.

On my system (8 cores), cornell.pov at 1280x1024 AA 0.3 renders in 20
seconds with a speedup ratio of about 7x. I haven't looked into what might
be chewing up the rest of the CPU time, other than to note that the cores
aren't quite 100% pegged in the first five or so seconds of the render. (I
am guessing it may be related to the early sampling and octree code but
either way I'm happy enough with it just as it is:)

I haven't tried any animations yet or anything.

-- Chris

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