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I was doing a render earlier today, and I got to wondering about
something... Suppose you write something like

#declare A = seed(...);
#declare J = rand(A);
#declare K = rand(A);

POV-Ray's rand() function returns random numbers in the (closed?)
invertal 0..1. But what is the minimum difference between J and K?
Presumably if you're really fluky they might just happen to have the
exact same value (improbable but not impossible). Assuming this is
not the case, what is the smallest amount they can differ by?
Specifically, I presume that POV-Ray does its calculations using some
finite level of precition. Is the minimum difference in random
answers equal to the minimum possible difference at this precition,
or is it larger? (If that makes sense!)

It's not earth-shatteringly important for me to find out the answer,
I'm just curiose ;-)

Andrew.

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