Actually the whole macro can be replaced with a function (which calls
other functions). I tried this once, and by doing this the "rendering"
speeds up by about 30% (IIRC).

  There are other (simple) optimizations that could be added to the code,
such as caching the last shadowing sphere for each light source, but I feel
that would be a bit out of the scope of the tutorial.

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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