http://bsmooth.de/BSolutions/#Radiosity Klaus Busse posted his tips about blurry reflection / fake radiosity ages ago. I'd seen people mention blurry reflection here before and assumed the only reason they weren't using it much is because of the render times. It's a very powerful technique and is probably as close as Bryce5 can come to simulating radiosity. Unfortunately, the reflections aren't really 'blurry' enough (check out unnatural 'shadow' under AgentSmith's orb), and colours are reflected too strongly (a blue sky will cause the ground and objects to be absurdly blue). In the basic tests above the only 'light' is the Bryce sun, and there are no ambient settings at all. The rest of the illumination on the objects comes from reflective interaction with the sky, ground and other objects. I have some other images here somewhere; I'll post later.