Re: the spring bounce back movement, with only 1 kf and an expression?

Something like this should give a little bounce at the last keyframe:

k = .05; // spring constant
d = 10; // damping constant
freq = 4; // oscillation frequency

if (numKeys > 0){
if (time > key(numKeys).time){
t0 = key(numKeys).time;
t = time - t0;
v = velocityAtTime(t0)*(k*Math.cos(freq * t * Math.PI * 2)/Math.exp(t*d));
valueAtTime(t0) + v;
}else{
value
}
}else{
value
}


Dan