> Rand takes a special seed value as an argument.  It should be like this:
>
> camera{}
> light_source{0 color rgb 1}
> #declare Seed = seed(5);
> #declare testval=rand(Seed);


Ooops. That was the way I used it (with #local, not #declare to be precise),
but I simplified it too much while I was chasing for my mistake. I'll try
again this evening...

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