• Adobe After Effects Expressions

  Random intervals between LoopOut (‘pingpong’)

  Posted by Saulo Dal pozzo on January 31, 2023 at 5:57 pm

  Hey! Thanks for your time.

  So I have a shape layer with 2 keyframes in its scale from 0 to 100 with a specific easing. I wanted to use the LoopOut PingPong expression in such a manner that the animation randomly holds, for a random duration, at both 0 and 100 before continuing with the loop.

  It would look like this: the shape goes from 0 to 100 scale, stays at 100 for a random amount of time, then goes back to 0 and stays at 0 for a random amount of time.

  Is it possible?

  Saulo Dal pozzo replied 3 years, 6 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  January 31, 2023 at 6:38 pm

  I think it will look something like this:

  minHold = .1;
  maxHold = .75;
  t1 = key(1).time;
  t2 = key(2).time;
  d = t2 - t1;
  if (time >= t1){
    t = tPrev = t1;
    while (t <= time){
      tPrev = t;
      seedRandom(tPrev,true);
      h1 = random(minHold,maxHold);
      h2 = random(minHold,maxHold);
      t += d*2 + h1 + h2;
    }
    tDiff = time - tPrev;
    if (tDiff < d)
      valueAtTime (t1 + tDiff)
    else if (tDiff < d + h1)
      key(2).value
    else if (tDiff < 2*d + h1)
      valueAtTime(t2 - (tDiff - (d + h1)))
    else
      key(1).value;
  }else
    value
• 

  Saulo Dal pozzo

  January 31, 2023 at 6:45 pm

  Worked like a charm! Thanks a lot

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