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Intertial Bounce

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Essentially, Inertial Bounce creates a bouncing motion of any parameter from one keyframe to the next, based on its velocity.
 After Effects CS3
Useful things
Expressions

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Being that true "velocity" includes the vector (or traveling direction in 3D space), the bounce happens in whatever direction the object is traveling. This also accounts for scalar or array values, so you'll find that this expression works just as well on 2D rotation as it does on 3D position. It's very cool!

This expression is a bit of a community effort. The seeds were certainly planted by the great Dan Ebberts, and then a modified version was posted on mograph.net. Although I've made a slight modification to it to make it a little more user friendly, it's nothing that I will lay claim to as my own code. Nonetheless, it's a great helper and I use it all the time.

Modify "amp" for the amplitude or how much bounce is present. The variable "freq" is the frequency, or how frequently the bounce occurs. The "decay" is like a friction or mass setting, a higher value means a shorter decay over time.
amp = .1;
freq = 2.0;
decay = 2.0;

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)
posted by MadDocc on Feb 24, 2010

 

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