• Adobe After Effects Expressions

  how apply inertial bounce on parented layer

  Posted by Fernando Huezo on May 20, 2015 at 5:38 pm

  Hi there!
  I need help with something
  I want know how to apply a inertial bounce expression on parented layer
  I tried only apply the expression but it does not work, only using keyframes in the own layer.
  Some idea?

  Fernando Huezo replied 10 years, 12 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  May 20, 2015 at 7:22 pm

  Assuming the keyframes are on the layer’s parent’s position property, something like this could work:

  
freq = 3;
decay = 5;

  p = parent.transform.position;
n = 0;
if (p.numKeys > 0){
n = p.nearestKey(time).index;
if (p.key(n).time > time) n--;
}
if (n > 0){
t = time - p.key(n).time;
p1 = toWorld(anchorPoint,p.key(n).time);
p0 = toWorld(anchorPoint,p.key(n).time - .01);
amp = (p1 - p0)/.01;
w = freq*Math.PI*2;
value + amp*(Math.sin(t*w)/Math.exp(decay*t)/w);
}else
value


  Dan
• 

  Fernando Huezo

  May 20, 2015 at 8:10 pm

  Its works!
  I just change the P value for the slider that control the X position, Here is where are the keyframes, I guess that is much easier if I apply the values on the null position and define the lowest and highest distance.

  Thank you very much!

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