• Adobe After Effects Expressions

  Overshoot position expression with ease in keyframe

  Posted by Daniel Lorenzo on August 5, 2015 at 2:53 pm

  Hi everybody

  I’m trying to apply the overshoot expression from Ebberts to a position animation, but it seems to work only with linear keyframes. I would like to reduce velocity as we approach the second keyframe, but when I convert it to ease in bezier, the expression doesn’t work anymore. Does anybody know how to combine the overshoot expression with an ease in animation? Thanks a lot!

  freq = 3;
decay = 5;

  n = 0;
if (numKeys > 0){
n = nearestKey(time).index;
if (key(n).time > time) n--;
}
if (n > 0){
t = time - key(n).time;
amp = velocityAtTime(key(n).time - .001);
w = freq*Math.PI*2;
value + amp*(Math.sin(t*w)/Math.exp(decay*t)/w);
}else
value

  Daniel Lorenzo replied 10 years, 10 months ago 2 Members · 3 Replies
• 3 Replies

• 

  Dan Ebberts

  August 5, 2015 at 3:42 pm

  I don’t think that will work. The overshoot is based on velocity coming into the keyframe. If you ease in, there’s no velocity.

  Dan
• 

  Daniel Lorenzo

  August 5, 2015 at 4:09 pm

  Thanks Dan for your quick reply. I understand what you mean. So, if you want to gradually reduce the velocity of your animation and overshoot at the end, would you suggest manual keyframing, then?
• 

  Daniel Lorenzo

  August 5, 2015 at 4:47 pm

  Thanks to your explanation, I found myself the answer. It was just a matter of tweaking the velocity graph, changing the incoming speed of the second keyframe to anything above 0. Thanks for your help!

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