Wolfgang Wieser <wwi### [at] gmxde> wrote:
> #declare f_besselJ = function { internal(81) }
> #declare f_besselJD = function { internal(82) }
> #declare f_CAVITY = function { internal(83) }

  You should really use functions by their official names. The internal()
ID numbers are reserved and should not be used (because they can change
at any time with a new version, without any notice, and can break old
scenes).
  I tried this scene with POV-Ray 3.5 and it says

Parse Error: Function 'internal(81)' does not exist.

  Are you using some kind of patched version?

-- 
#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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