dragonmage nous apporta ses lumieres en ce 19-03-2007 22:20:
> Warp <war### [at] tagpovrayorg> wrote:
>> dragonmage <dra### [at] gmailcom> wrote:
>>> It would appear from the online doc
>>> (http://www.povray.org/documentation/view/3.6.1/223/) that jittering is not
>>> used when antialiasing is turned off: "If anti-aliasing is not used one
>>> sample per pixel is taken regardless of the super-sampling method
>>> specified."
>>> Is this a correct interpretation of the text?
>>> Are there any random sampling algorithms used when antialiasing is turned
>>> off?
>>   Just to make sure that you don't have a confusion about this:
>> Antialiasing jittering is only done inside a pixel for the extra rays
>> for the antialiasing. It's not randomized raytracing as in "send rays
>> in random directions".

>>   If you randomize the rays more than a pixel, you'll just get a noisy
>> image (in fact, even if you randomize inside a pixel but without antialising
>> you will also get noise).
>>   You can actually simulate what it looks like by adding something like
>> this at the end of your camera definition block:

>> normal { bumps .01 scale 1e-5 }

>> --
>>                                                           - Warp

> ok, so jitter won't "move" a pixel but may change its rendered colour?
> I have "    jitter 0" in the global settings, photons anyway so, according
> to the manual there will be no jitter subsampling.

> thanks



There will be no jittering in the subsampling. All subsamples will be taken in a 
nice, regular array of points.

-- 
Alain
-------------------------------------------------
I'm interested in the fact that the less secure a man is, the more likely he is 
to have extreme prejudice. (Clint Eastwood)

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