Francois Dispot <woz### [at] NOSPAMclub-internetfr> wrote in article
<35f447ba.943075@news.povray.org>...
>  Nieminen Mika <war### [at] assaricctutfi> wrote:
> 
> >  I just discovered that you can make also focal blur with the targa
> >averager.
> >  You may say "Hey! There is focal blur in povray already."
> >  That's right. But you may have noticed that focal blurred images made
with
> >povray are grainy, with random and annoying noise, no matter how many
blur
> >samples you use. I don't know exactly why this happens, but I suppose
that
> >it's because povray shoots the blur samples at random, with different
random
> >values from pixel to pixel. This seems to produce that random noise.
> >  The focal blurred images made by averaging are a lot smoother.
> >
> >  For more info see http://iki.fi/warp/PovUtils/average/focalblur.html
> >
> >-- 
> >                                                           - Warp. -
> 
> One of the problems (the other comes from focal_point and aperture
> which can be easily solved now) of focal blur comes from the fact that
> the values (even the "best" ones) provided in the documentation are
> far from being accurate. If you dare to use really sharp values for
> sampling, like:
> 
>    blur_samples 100
>    confidence 0.999
>    variance 1/255
> 
> you can easily get something like this:
> 
> http://www.geocities.com/Vienna/7709/s17.jpg
> 
> And here again, the problem is time... as always!
> But here you can control the depth of field more efficiently.

	This is nothing to do with focal blur, I just wanted to say WOW! Excellent
image ! Every now and then I see an image and think "If only I had the
skill to produce something that photorealistic with POV", this was one of
those times.

-- 
Scott Hill
Sco### [at] DDLinkscouk
Software Engineer (and all round nice guy)
Company homepage : http://www.ddlinks.demon.co.uk

"The best trick the devil ever pulled was convincing people he didn't
exist..."
								- Verbal Kint.

"the Internet is here so we can waste time talking about nothing in 
 particular when we should be working" - Marcus Hill.

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