Bounce Expression in After Effects

How to apply the bounce expression in After Effects?

1. Animate your property with at least 2 linear keyframes.
2. Alt-click on the property and paste the expression below.

amp = .025; // amplitude
freq = 2.0; // frequency
decay = 3.0; // decay

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;
}

Change amp, freq and decay variables to modify the bounce.

How to fix “Invalid numeric result” error in bounce expression?

Try making your composition shorter or reducing decay value.