OK ... here is it ...
after 10h its complete with 30000 spheres ...
... not enough as you can see ...

But:
 I used quite high FB-settings, and I have
a feeling, that the focal blurring doesn't
really work as it should. I wonder if this
hard edge between the BLACK and the smooth
gradient is supposed to be there or with a
better process can be avoided ...

My Camera is like this:

camera

  cylinder 1
  location  <0.0, 1, -4.0>
  sky <0.25,1,0>
  right x*8/3
  angle 120
  look_at <0.0, 0.6,  0.0>

  aperture 0.10
  blur_samples 1024
  focal_point <0,1,5>
  confidence 0.999
  variance 1/10240
}

Any idea anyone ?

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Download 'simpleBackground.jpg' (28 KB) Download 'FB-Errors.png' (68 KB)

Preview of image 'simpleBackground.jpg'

Preview of image 'FB-Errors.png'