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.
--- 
Francois DISPOT
e-mail woz### [at] NOSPAMclub-internetfr
http://www.geocities.com/vienna/7709

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