Norbert Kern wrote:
> 
> interesting, but in the end I want to do it with more than 1000000 discs.
> IIRC you can add so many patterns in a single function.
> 

Then use branches:

fa = max(fb, fc)
fd = max(fe, ff)
fg = max(fa, fd)

You're only going to see a white blob with 1 million discs. To get an 
idea, set your background to rgb <0,0,0> and place 1 million discs with:

color_map {
   [0.0  rgb 1.0 transmit .5 filter 0]
   [0.3  rgb 1.0 transmit 0 filter 0]
   [0.9  rgb 1.0 transmit 1 filter 0]
   [1.0  rgb 1.0 transmit 1 filter 0]
}

Won't be exactly what you're trying to do, but it will give you an idea 
(until you reach max_trace_level).

  -Shay

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