Gilles Tran wrote:
> 
> Xplo Eristotle wrote:
> 
> > It's been a while since I actually messed with pretrace parameters, but
> > IIRC, error_bounds > .1 benefit visually from a really precise pretrace
> > (although above .4 or so, the benefit may not be worth the time anyway),
> > whereas smaller error_bounds don't, so pretrace should be set to 1 to
> > save time. Don't take this as absolute gospel, though; these are
> > approximations off the top of my head, and not based on extensive testing.
> 
> My feeling too. My rule of thumb would be like this:
> [1] test renders with no quality requirement : pretrace 1 (saves time)
> [2] final renders with error_bound < 0.1 : pretrace 1 (saves time)
> [3] all other types of radiosity renders  : small pretrace values may save time
> and improve quality
> 

I have made some more test renders, available on the URL posted in the
other subthread.  The differences in speed are quite marginal and the
quality differences seem to diminish with lower error_bound, just like
Xplo said.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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