> I have some questions about the radiosity save_file and
> load_file, hope someone can help.

Hi Bill!

What you want to do is the following: use pretrace_start 1 and pretrace_end
1 on the second pass where you load the data. There is no need for
pretracing when you're loading the data.

So, yes, the data gets used. always_sample on would introduce new samples in
the final render whenever POV-Ray's statistics (or whatever method it uses)
determine that an extra sample is needed. Especially for animations this can
add noise to the scene.

AFAIK, Antialiasing will only be used on the final render, not during the
pretracing, and as you should be using always_sample off, there shouldn't be
a need to use antialiasing on the first pass.

<shameless plug>
You might also want to have a look at my Radiosity-Experiment to be found
here:
http://www.nolights.de/past_pros/radiosity/radiosity.html
It not only covers what you've asked, but goes further and uses a method
that has been developed here in the newsgroups: smoothening the
radiosity-data on the second pass. It can reduce artifacts, but also loses
detail. As far as I'm concerned, less artifacts is better.
</shameless plug>

Regards,
Tim
-- 
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>

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