20 Aug Inertia Bounce Script for After Effects

amp = .07;
freq = 2.0;
decay = 10.0;

n = 0;
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){
v = velocityAtTime(key(n).time – thisComp.frameDuration/10);
value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);
}else{value}
by Harry J. Frank, graymachine.com

(Min. Version: After Effects CS3, Category: Useful things, Type: Expressions)

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