Blue Herring nous illumina en ce 2008-05-21 13:36 -->
> Alain wrote:
>>> pretrace_start 0.32
>> Changing the pretrace_start usualy have little to no effect. Keep the 
>> default of 0.08.
>> Changing by some small value may, in some cases, get rid of some 
>> artefacts near corners.
> 
> I had some vague notion that it helped with sample distribution, but it
> was likely my imagination.
> 
>>> pretrace_end   0.02
>> Default value.
>> Try reducint this to 0.01, 0.005 or 0.0025
>>> count 400
>> Maybe a larger value here? Try 600 or 800.
>>> nearest_count 5
>> That's the default value.
>> You can go up to 20. Low effect on render time, can greatly improve 
>> end result.
> 
> Gotcha.  I was shooting for more defined shadows than I got, so I didn't
> really want to average them out too much.
> 
>>> error_bound 1
>>> recursion_limit 3
>> Default value.
>>> low_error_factor 0.5
>> Meybe try a somewhat smaller value. Will take more time on the final 
>> pretrace step.
>>> gray_threshold 0
>> Default value.
>>> minimum_reuse 0.015
>> Default value.
>> You may need a value larger OR smaler. Don't go over 0.02. Don't go to 
>> small, as smaller values will increase the render time.
> 
> Gotcha.
> 
>>> brightness 1
>> Default value.
>>> adc_bailout 0.01/0.4
>> That's 0.025, probably to large. Try adc_bailout 0.01/3 or 0.01/4.
> 
> Thanks, I'll bet this isn't helping.  It didn't seem right, but I didn't
> really know where to go with it.
> 
>>> normal off
>> Default value.
>>> media off
>> Default value.
>>>
>> Every time you use a default value, you can skip that option.
>>
> 
> Thanks for the advice, I appreciate it.  I usually put all the options
> in there deliberately, even though its often redundant.  My memory of
> the defaults is fuzzy, so I like to be sure I know exactly the value I'm
> using.  I also like to see all the values, for me it makes it easier to
> tweak them around.  Lastly, I think some part of my personality
> distrusts default values =)
> 
> 
> 
When I say that you can skip a parameter with default value, I never sayd that 
you /must/ keep those set at default value. If keeping those help you, then keep 
them.

-- 
Alain
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