news:web.416881092fa1b46b31e6d870@news.povray.org...
> When I save radiosity data to a file, does it save the pre-render data
only,
> or does it also save samples taken during the render phase? It seems to be
> the pre-render only, but I want to be sure of this.

No, it save all radiosity samples, the ones taken during the pre-trace and
the ones during the final trace.

> Is the save file independent of resolution? Can I save radiosity data on a
> 160x120 image and then load it on a 1600x1200 image? My guess is that it
is
> not resolution-dependent, but again, I want to be sure.

Yes.

> In what situations do people normally use save/load of radiosity?

It is used for the 2 pass rendering technic. This technic consist of doing a
first pass at a relatively low resolution without anti-aliasing and with a
simplified geometry but with high quality radiosity parameters. The
radiosity samples are saved and reused in a second render with
anti-aliasing, high resolution, complete geometry. For this final render, no
radiosity samples should be computed, only the ones from the first render
should be use so there is no pre-trace (pretrace_start and pretrace_end set
to 1) and no radiosity computation during the final phase (always_sample
off)
See "Dummy radiosity" on this page http://www.ignorancia.org/t_tips.php

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