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Carlos Yasik
Thursday, 08 August 2019 / Published in Blog, Filmmaking, Motion Graphics

Inertial Bounce Expression For After Effects

Inertial Bounce Expression

This inertial bounce expression for Adobe After Effects will help your animations, like text, to bounce more organically, with will take out the robotic look of your motion graphics.

Just copy this text and paste the expression on the stopwatch icon on any parameter you want to apply. I usually use it for position, but it also works for size and rotation.

amp = .1;
freq = 2.0;
decay = 2.0;
n = 0;
time_max = 4;
if (numKeys > 0){
n = nearestKey(time).index;
if (key(n).time > time){
n--;
}}
if (n == 0){ t = 0;
}else{
t = time - key(n).time;
}
if (n > 0 && t < time_max){
v = velocityAtTime(key(n).time - thisComp.frameDuration/10);
value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);
}else{value}
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Tagged under: action script, after effects, expression, expressions

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