Add “Inertial Bounce” Expression to a current Expression

[Dan Ebberts]

Hmmm…. I don’t think it will work. Because of the ease, the x-rotation will have zero velocity at the times corresponding to the y-rotation’s keyframes. No velocity, no inertial bounce. If you use the y-rotation’s velocity the bounce won’t look right.

Dan

[Roland R. kahlenberg]

Thanks Dan. For my, rotation script, I changed its ‘source’ layer to a proxy layer with KFs identical to the original ‘source layer’. The proxy is of course a Null and I can apply the Inertial Bounce script to its KFs.

This works but requires the proxy layer to be created and updated manually.

Cheers
RoRK

Intensive AE & Mocha Training in Asia.

[Dan Ebberts]

I think you could modify the proxy layer’s bounce expression to point at the keyframed property on the original source layer. That way you wouldn’t have to update the proxy. I haven’t tested it, but it would look like this:


p = thisComp.layer("Page 01").transform.yRotation;
n = 0;
if (p.numKeys > 0){
n = p.nearestKey(time).index;
if (p.key(n).time > time) n--;
}
if (n == 0){
t = 0;
}else{
t = time - p.key(n).time;
}

if (n > 0){
v = p.velocityAtTime(p.key(n).time - thisComp.frameDuration/10);
amp = .05;
freq = 4.0;
decay = 2.0;
p.value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);
}else{
p.value;
}


Dan

[Roland R. kahlenberg]

That works very well Dan. Thanks a bunch!

Regards
RoRK

Intensive AE & Mocha Training in Asia.