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Grassblade nous apporta ses lumieres en ce 18-12-2006 17:34:
> "Dennis Clarke" <dcl### [at] blastwave org> wrote:
>> I have been trying to get rid of large black dots in some glass objects.
>> I have the following in my global settings :
>> global_settings {
>> assumed_gamma 1
>> max_trace_level 32
>> max_intersections 128
>> ..
>> ..
>> ..
>> an example of what I mean may be seen here :
>> http://www.blastwave.org/dclarke/povray_AMD64/media1_001.png
>> any ideas ?
>> Dennis
> Hmm, yes, I've got the same, only worse:
> http://i21.photobucket.com/albums/b288/aardpast/Real%20pics/RingsMaxTrace20.png
> I've tried cranking up Max Trace level to 50, but the result doesn't change
> much, in fact it's slightly worse in places. I even tried a Max_trace_level
> of 250, which is just as bad.
> I have two spotlights that are inside the ruby, if I move them outside the
> ruby, the black spots disappear. No amount of looks_like or union of the
> light and the ruby changes anything. An adc_bailout of 0 with max trace of
> level 200 doesn't seem to ever get to the ruby. And adc_bailout of 1/200048
> with Max trace of 50, is a *lot* worse, with black dots peppering the ruby.
> It looks like the only thing that works is to make sure your lights aren't
> contained in any solid objects. Reducing media might possibly work too.
adc_bailout 0 turn it completely off as any change is larger than 0.
A value of 1/200048 is ridicously small, still to small if outputing as 48 bit
PNG or TGA. In this case, the floor value is 1/65536, as it's the smalest
difference you can find.
Instead of making adc_bailout smaller, try to make it LARGER! Try adc_bailout
1/128 or 0.01 to start.
This works best when coupled with some contained media or some fade_color.
--
Alain
-------------------------------------------------
Don't cry because it is over, smile because it happened.
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