: ...if macros are defined strictly as mere copy-and-paste
: operations

  But they aren't.

  This:

#macro A()
  #local Val = 2;
#end

#local Val = 1;
A()
// Val is 1 at this point

is *not* what a copy-and-paste macro scheme would do:

#local Val = 1;
#local Val = 2;
// Val is 2 at this point

-- 
#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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