"Vadim Sytnikov" <syt### [at] rucom> wrote in message
news:3e4a7ee8$1@news.povray.org...

> To be even more specific: think about blocks with scattered trees. If your
> streams' sub-sequences overlap, you may end up with many *equally* (not even
> "similarly") shaped and located trees in different blocks. Hope you got the
> idea...

True - however the sheer length of the stream would make this unlikely. Also,
consider:

#declare R1 = seed(3245);
#declare R2 = seed(7342);

#while(true)
    #declare A1 = rand(R1);
    #declare A2 = rand(R2);
    #declare A3 = rand(R2);
    .....
#end

Because R2 is hit twice, but R1 only once, A1 and A2 will never show the same
sequence (afaik).

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