• Adobe After Effects Expressions

  Random Number Expressions

  Posted by Cameron Crook on September 24, 2010 at 5:18 am

  Hi, I am trying to create a matrix rain type effect. I am using a custom particle i am creating driven by the random() expression function to generate random integers between 0 and 9 and it also has the posterized function to keep it from changing every frame. Is there an expression i can use to ensure that each time the integer changes it doesn’t end up being the same integer as the previous. These are the expressions i have in my source text as of now:

  Thanks for any help

  posterizeTime(10);
s=random(9);
Math.round(s)

  Cameron Crook replied 15 years, 10 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  September 25, 2010 at 12:28 am

  This expression should give you a different digit every three frames:

  holdFrames = 3;
  seedRandom(index,true);
  f = timeToFrames();
  seg = Math.floor(f/holdFrames);
  r = Math.floor(random(10));
  for (i = 0; i < seg; i++) r = (r + Math.floor(random(1,10)))%10;
  r

  Dan
• 

  Cameron Crook

  September 25, 2010 at 2:54 am

  Thanks that is exactly what i needed.

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