I see a potential problem here. Consecutive seeds can give numbers that are
markedly non-random. For example, make a loop to generate a string of spheres,
whose y position is a random number whose seed changes linealrly:

#declare C=0;
#while(C<100)
  #declare S=seed(C);
  #declare R=rand(S);
  sphere{<C,R,0>,1}
  #declare C=C+1;
#end

Chris Huff wrote:
> 
> The only situation I can think of is where you want a bunch of different
> versions of an object. In that case I simply seed the stream with a
> large number multiplied by clock.
> 
> #declare globalRandStream = seed(50000*clock);
> 
> Then I just make an animation of it, and pick out the good versions.
> 
> Not saying this is better or anything, just the way I do it.

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