POV-Ray: Newsgroups: povray.general: Simple trick for getting different random numbers in each render: Simple trick for getting different random numbers in each render

POV-Ray : Newsgroups : povray.general : Simple trick for getting different random numbers in each render : Simple trick for getting different random numbers in each render		Server Time 10 Aug 2024 21:08:34 EDT (-0400)

From: Nieminen Juha
Date: 30 Oct 1999 04:30:12
Message: <381aac94@news.povray.org>

People continously are asking for a way for getting different random numbers
from render to render.
  Well, the solution to this is so simple that I'm ashamed of not having
discovered it until now.

  Add this at the beginning of your .pov file:

#if(file_exists("seed.dat"))
  #fopen ifile "seed.dat" read
  #read(ifile,R)
  #fclose ifile
  #declare Seed=seed(R);
#else
  #declare Seed=seed(0);
#end

  Then use rand(Seed) in your pov code.

  Then add this at the end of your .pov file:

#fopen ofile "seed.dat" write
#write(ofile,int(rand(Seed)*1000000))
#fclose ofile


  It's that simple. Stupid me.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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