Keyframe Overshoot
freq = 3;
decay = 5;
n = 0;
if (numKeys > 0){
? n = nearestKey(time).index;
? if (key(n).time > time) n--;
}
if (n > 0){
? t = time - key(n).time;
? amp = velocityAtTime(key(n).time - .001);
? w = freq*Math.PI*2;
? value + amp*(Math.sin(t*w)/Math.exp(decay*t)/w);
}else
? value
Keyframe Bounce Back
e = .7;
g = 5000;
nMax = 9;
n = 0;
if (numKeys > 0){
? n = nearestKey(time).index;
? if (key(n).time > time) n--;
}
if (n > 0){
? t = time - key(n).time;
? v = -velocityAtTime(key(n).time - .001)*e;
? vl = length(v);
? if (value instanceof Array){
? ? vu = (vl > 0) ? normalize(v) : [0,0,0];
? }else{
? ? vu = (v < 0) ? -1 : 1;
? }
? tCur = 0;
? segDur = 2*vl/g;
? tNext = segDur;
? nb = 1; // number of bounces
? while (tNext < t && nb <= nMax){
? ? vl *= e;
? ? segDur *= e;
? ? tCur = tNext;
? ? tNext += segDur;
? ? nb++
? }
? if(nb <= nMax){
? ? delta = t - tCur;
? ? value +? vu*delta*(vl - g*delta/2);
? }else{
? ? value
? }
}else? value
