Bounce Expression in After Effects

How to apply the bounce expression in After Effects?

Animate your property with at least 2 linear keyframes.
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;
}

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.

Please log in or register to download files.