Wasn't it David Wallace who wrote:
>If you are going to generate a large number of rocks you might want to pass
>an actual seed into the macro rather than just an integer.  That way you get
>new rocks each time you call the macro.

But that very fact makes it less appropriate for Daniel's original
purpose. He wanted to LOOK at a a large number of rocks, and then choose
a few that happened to look nice to use in a real scene. So it's more
appropriate to have a macro that produces the same rock when passed the
same parameters.

-- 
Mike Williams
Gentleman of Leisure

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