As noted somewhere else in this thread, the aa_level doesn't help this 
artefact, it seems it occurs in some way that aa_level is oblivious to. I 
tried aa_level 6 aa_threshold 0.1 and still had exactly the same artefacts.

-- 
Tek
http://evilsuperbrain.com

"Tom York" <alp### [at] zubenelgenubi34spcom> wrote in message 
news:web.456de89b417043dd7d55e4a40@news.povray.org...
> =?ISO-8859-15?Q?=22J=E9r=F4me_M=2E_Berger=22?= <jeb### [at] freefr> wrote:
>>  Then you should try to raise the aa_level (default is 4) and lower
>> the samples back. Start at samples 20 aa_level 6 for example...
>
> I think the default for aa_level is 3 in 3.6 and later versions.
>
> Tom
>
>

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