I accidentally posted this under povray.tools.general, I think, sorry.

I think would be useful if there was a way to generate different random 
streams each time a render is run without changing the seed value each 
time.  Perhaps something where:

#declare r1 = seed(100);
#declare r2 = rseed();

Or perhaps no arguments to 'seed' means to use a random initial value 
generated from the current time or entropy file or /dev/random, etc.

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