Alain  wrote in message <497b6419$1@news.povray.org>:
> seed(pow(31*pi*clock,frame_number)}

What you are doing here is try to invent a brand new random function. There
are two problems with this method:

- Designing a random function is hard, and unexpected patterns often happen.
  Experts in cryptography around the world work very hard to create new
  ones, and they often fail.

- This particular function uses huge floating-point numbers, and quickly
  overflows.

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