Test with pretrace_start and pretrace_end set to 1
against pretrace_start 0.04, pretrace_end 0.01. Without
pretrace the render was 20% faster but the image is patchy.

http://www.pp.htv.fi/kkivisal/pretrace.jpg

It seems that pretrace forces an even distribution of radiosity
samples so the rad lighting will be smooth everywhere.


_____________
Kari Kivisalo

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Kari Kivisalo wrote:
> 
> Test with pretrace_start and pretrace_end set to 1
> against pretrace_start 0.04, pretrace_end 0.01. Without
> pretrace the render was 20% faster but the image is patchy.
> 
> http://www.pp.htv.fi/kkivisal/pretrace.jpg
> 
> It seems that pretrace forces an even distribution of radiosity
> samples so the rad lighting will be smooth everywhere.

That's about right i think, as discussed in p.b.i. recently, it much
depends on the settings (specifically error_bound) whether it's
faster/better without pretrace.

You can still see my recent tests on this matter BTW:
http://www.schunter.etc.tu-bs.de/~chris/rad/radiosity_pretrace.html

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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