• Adobe After Effects Expressions

  Bounce y pos at each marker

  Posted by Andres Torres on September 16, 2012 at 6:37 pm

  I’m simply trying to write an expression to bounce y position at each marker. My current code produces unnatural results where the position immediately jumps at each marker.

  Thanks.

  n = 0;
if (marker.numKeys > 0){
n = marker.nearestKey(time).index;
if (marker.key(n).time > time){
n--;
}
}

  if (n == 0){
  value;
  } else {
  freq = 1.0; //oscillations per second
  amplitude = 90;
  decay = .5;
  t = time - marker.key(n).time;

  posCos = Math.abs(Math.cos(freq*t*2*Math.PI));
y = amplitude*posCos/Math.exp(decay*t);
position - [0,y]
}

  Andres Torres replied 13 years, 10 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  September 16, 2012 at 7:34 pm

  Just change Math.cos to Math.sin

  (Edit) Actually, I’d also change posCos to posSin, just so the variable name would match what it’s used for.

  Dan
• 

  Andres Torres

  September 16, 2012 at 8:22 pm

  Thanks Dan, you’re amazing.

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