"Alain" <ele### [at] netscapenet> wrote in message 
news:45edf061@news.povray.org...
> I always wonder WHY peoples think that they need very low error_bound?

www.beantoad.com/newimages/shaker16.jpg
versus
www.beantoad.com/newimages/shaker20b.jpg

If you're dealing with a situation where you want deep shadows, a lower 
error bound keeps objects from floating on the floor.  Unfortunately, it 
results in some splotchies, so I then turned on focal blur to smooth them 
out a bit.  (Yes, in the above, my "sun" was a bit too yellow)

> (0.1 IS very low: 1/18 default value) It increase the rendering time, 
> requier higher count value (500 is to low in your case) and tend to cause 
> major slpotchiness. It also greatly increase memory use.
> If you need more samples increase count first. Try using a smaler 
> pretrace_end, like 0.01 or 0.005.  You may set low_error_factor to a 
> smaler value than default, like 0.3 or somewhat less.
> Upping nearest_count can help reduce splotchiness, it maxes out at 20.
> You may have to increase max_trace_level by 2 or 3, maybe more, during the 
> second pass.
>

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