jhu schrieb:

> Does focal blur affect the radiosity data? My guess would be no. And how much
> smaller is an acceptable resolution to generate radiosity data for the main
> render?

In some sense focal blur does affect radiosity data: You potentially get 
a better sample coverage, because more rays are shot - and from slightly 
different origins. So as a result, this may force POV-Ray to take 
samples at places that would be missed otherwise. Other than that, there 
is no effect on radiosity.

Thinking of the "main pre-render" as an additional pretrace step, I'd 
suggest a resolution of (roughly) 2/pretrace_end in whatever dimension 
is larger; the other dimension should be chosen according to the 
intended aspect ratio of the main render. This way, you indeed mimick an 
additional pretrace step (so you may choose a larger pretrace_end in the 
first place).

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