mone schrieb:

> I see. So as a rule of thumb it would be good to use the save_file/load_file
> options together with high quality parameters for a low-res image, so the
> sampled data can be used again for the high-res image?

That depends.

Just rendering the scene at low resolution with save_file, and then 
rendering it at high resolution with load_file, will give you not much 
of an advantage; to the contrary: You'll just force POV-Ray to run the 
main render twice (though at low resolution the first time).

It only pays off in case you can somehow manage to simplify the scene in 
a manner that does not affect radiosity calculation much; good 
candidates for this would be minor media  effects, micronormals for 
slightly blurred reflections, or low-res versions of textures. (Make 
sure not to change any actual geometry though.) In that case it's worth 
running the radiosity pretrace with this simplified scene, with low 
resolution to not waste much time on the not-really-main render; for the 
final render, you can then get away with a single, very coarse pretrace 
(IIRC POV-Ray always does at least one pretrace pass, even if you load 
previously generated data).

(Note that with POV-Ray 3.7, the syntax for saving and loading radiosity 
data has changed.)

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