POV-Ray : Newsgroups : povray.pov4.discussion.general : Basic blur : Re: Basic blur Server Time
18 Sep 2021 00:01:46 EDT (-0400)
  Re: Basic blur  
From: Alain
Date: 22 Jan 2019 12:05:14
Message: <5c474d4a$1@news.povray.org>
Le 19-01-22 à 09:00, clipka a écrit :
> Am 22.01.2019 um 12:27 schrieb Kenneth:
> 
>> Depending on the bump_size (the 0.001, vs. a larger value), the 
>> resulting image
>> *might* look a bit noisy-- but my own recourse would be to render the 
>> scene
>> with, say, 5 frames of an animation (no camera movement, but moving 
>> the bumps
>> pattern in  x via the clock, by some large random amount; then bring 
>> those
>> images back into POV-Ray and 'average' them together (using the'average'
>> pattern) and then re-photograph the result 1-to-1 for the *final* 
>> render. This
>> should help blend the noise.
> 
> As I said, the new anti-aliasing mode 3 is your friend there: Just scale 
> the bumps small enough, and it will take care of the rest, no extra work 
> needed. It does this by randomly jittering the sample rays within the 
> pixel, and adapting the number of samples to the variance it finds.


The anti-aliasing mode 2 may also be used here, but you need to increase 
the recursion level to 4 or 5 and reduce the threshold to 0.1 or less. 
The result won't be as good as with mode 3, but will probably be a 
little faster.

Another option is to use a small amount of focal blur. Make the aperture 
less than 1/1000 of the distance to the focal plane. This will force a 
fair amount of oversampling.


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