> #local Spline=Distribution(0,1,array[3]{<0,0,0><1,0,0><2,1,0>})
> Add_Distribution(Spline,1,2,array[3]{<2,1,0><3,2,1><2,2,2>})

  That's quite longer. And it needs you to repeat points (<2,1,0> above).
  Compare to the equivalent in my proposal:

#local Spline=spline{ {0,<0,0,0>} <1,0,0> {1,<2,1,0>} <3,2,1> {2,<2,2,2>} }

(And that {1,<2,1,0>} could just be <2,1,0>, but I wanted it to be completely
equivalent to your example.)

-- 
#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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