Jaime Vives Piqueres wrote:

>   But, if so, how Gilles radiosity scenes look so nice? I my self tried
> just now pretrace start and end to 1 with my current irtc entry, and the
> result is a 30% faster than with the recommended settings. And,
> strangely, the result seems to be more "natural" although it has some
> artifacts.

To be frank, it's very confusing. I just tested this and the truth is that I
don't have a proper answer. In one little test scene, using Christoph's rad
"IndoorHQ" settings, using pretrace values <1 is better than pretrace 1
values : slightly lower rendering times, slightly less artifacts (but
artifacts nonetheless).
Now I'm sure to have experienced the same speed boost as you just noticed,
which is why I've been using these settings for almost a year with no
visible problems (I think that it was Xplo who found this trick). Note that
this could also explain why I don't have artifacts when I stop and resume
radiosity scenes (something I've been doing systematically to save memory,
even with 640 Mb of RAM).
I guess we should test this on full scenes. I just launched one of these
(800*320) with pretrace activated, and will render it again without. I
should have some answers on Saturday...

G.

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