• Adobe After Effects Expressions

  Randomising scale between 2 values with hold

  Posted by Mark Warner on May 14, 2015 at 3:43 pm

  I’ve search everywhere but need help!

  I have various layers that need to be scaled uniformly picking a random values between 45 and 60% over the course of the timeline. They need to hold for a certain length of time but that hold time needs to vary before jumping to another scale between 45 and 60%. Each layer needs to look different, i.e., a different seed so there’s no obvious sync between layers.

  The closest examples I’ve found have min and max hold times with min and max values and manipulate the seedRandom – but all the layers work together or smoothly animate between values.

  Can someone help?

  Mark Warner replied 11 years ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  May 14, 2015 at 5:15 pm

  Try this:

  minVal = 45;
  maxVal = 60;
  minDur = .5;
  maxDur = 1.5;
  t = inPoint;
  seedRandom(index,true);
  while (t <= time) t += random(minDur,maxDur);
  seedRandom(t,true);
  s = random(minVal,maxVal);
  [s,s]

  Dan
• 

  Mark Warner

  May 14, 2015 at 5:23 pm

  That’s brilliant Dan, thank you. It looks deceptively simple!!

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