: The message is right. Pig() returns vector (or color). You should add .gray
: operator or change pigment to pattern if you want MEGAPOV's behaviour.

  The latter is, IMHO, better. Why overburdern the engine with color
calculations when you will not ne using the colors for anything?

-- 
#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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