This has actually been a recent topic in several groups,
Here's a few to look for:

1.In povray.binaries.images check out a thread called "#macros".
  Steve made a useful contribution with a small tutorial and 
  examples. I found it very helpful(thanks Steve!).
2.In povray.general look for the subject title "Macro tutorial"
  started by Andrew Cocker.
3.In povray.unofficial.patches  "POV+for()" TonyB
  (Really you just want the end of this thread)
4.And there's some more in povray.unofficial.patches. the thread you
  want is POV+for() ;the second half really. 
5.You may also want to look through povray.utilities which has
  several examples of macros, for example: "Replace macro" "The most
  unuseful macro" and "Useless macro challenger"(which I found a use
  for <smile>).
6.And of course the povray help file...

Phil
-- 
...coffee?...yes please! extra sugar,extra cream...Thank you.

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