Bouncy effect when an object stops moving?

[Ben G unguren]

Set your scale or position keyframes as you want without the bounce, then take your the keyframe where the bounce should happen, move it forward two or three frames, and make a new keyframe that is LARGER than the last keyframe. That causes the scale or position to go too far, then pull itself back. A bouncy effect.

For more advanced methods, search around for elasticity expressions….

Ben Unguren
Motion Graphics & Editing
http://www.mostlydocumentary.com

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[Drew Johnston]

Thanks for your help, I found what I think is the perfect expression but it doesn’t seem to work. I’ll copy and paste it below. it was found from this URL where they give an example: https://lesterbanks.com/2011/01/swinging-kinetic-text-expressions-for-after-effects/

A user commented and said that the expression’s minus signs are dashes and that is why it is not working. How on earth do you type a minus sign? I have a macbook pro and there is only one version of a minus sign and its not working (i guess its a dash.

Any thoughts?

// Inertial Bounce (moves settle into place after bouncing around a little)
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);
amp = .02;
freq = 3.0;
decay = 5.0;
value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);
}else{
value;
}

[Angie Taylor]

The Minus symbol can be typed using the number pad of your keyboard, it should be directly above the Plus symbol.

cheers,

Angie

Angie Taylor animation & illustration for television, film, web and devices

https://www.angietaylor.co.uk
Twitter: theangietaylor
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[Darby Edelen]

Well, here’s the expression with your dashes fixed:

// Inertial Bounce (moves settle into place after bouncing around a little)
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);
amp = .02;
freq = 3.0;
decay = 5.0;
value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);
}else{
value;
}

Darby Edelen

[Drew Johnston]

Thanks so much, this saved my life. I can use it now and my animation looks so much better!!

[Eliezer Cisner]

Thanks, Darby!
As you can vaguely see in the image I posted, the bounce starts with shrinking, and then it grows. This looked a bit fake when I tried it, since as when it arrived to end of the down-scale, it suddenly scaled down another bit, causing a jerky feel. Is there any possibility to tweak this expression it should start with growing instead?

Thank you!