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Rotate with an inertial bounce? Also scale?

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Jim Dodson
Rotate with an inertial bounce? Also scale?
on Oct 12, 2012 at 4:10:15 am

My new favorite expression (new to me at least) gives a nice inertial bounce on position values.

Here it is (with Dan's fix for divide by zero error):

amp = .03;
freq = 3.0;
decay = 9.0;
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 && t < 1){
v = velocityAtTime(key(n).time - thisComp.frameDuration/10);
value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);
}else{value}

My question is: Is there a similar inertial bounce expression for Rotation? ALSO
For scale?

Thanks guys!!

Jim Dodson

8 Core Intel -- Mac - OSX


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Dan Ebberts
Re: Rotate with an inertial bounce? Also scale?
on Oct 12, 2012 at 5:07:59 am

Did you try it with scale and rotation? It should be property agnostic.

Dan



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Jim Dodson
Re: Rotate with an inertial bounce? Also scale?
on Oct 12, 2012 at 2:36:54 pm

** Success**

Turns out it works for scale (the amplitude was subtle so had to be increased to be noticeable). But, I got this error on orientation:

"Velocity is not supported for the orientation property."
So it had to be used on "Rotation" where it worked PERFECTLY. (I really did test this before I posted Dan, I just didn't see the bounce in the smaller icons because they were subtle -- increasing amplitude helped.)

As always Dan, thank you for your amazing talents!!

Jim Dodson

8 Core Intel -- Mac - OSX


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