The seed is used to determine the starting point for the random function
at the so called random generator. This chip contains a large amount of
numbers which are accessed by the rand() function. Even changing the
seed value by one should give you a completly new set of "random"
numbers, but you should get these numbers again if you use this seed
value again. If don't want this repetion you could try (I don't know if
this can be done in povray!) to use for example the system time as seed
value.

I hope this answered your question.


Greetings

Marc

-- 
Marc Schimmler
Institut fuer Computeranwendungen
Universitaet Stuttgart

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