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free wiggle, rubber, bounce, throw, inertia expressions i find useful
These expressions save so much time, you might get home earlier tonight just by reading this post. If you’ve ever animated these sorts of things manually, you’ll know what I mean. Most will need to be tweaked to your specific needs, but it’s just a matter of playing with the numbers a little, and understanding how they’ll change your animation. Here’s the goods:
Jumpy Wiggle 1 makes wiggle skip and hold rather than move fluidly.
// Jumpy Wiggle 1 (moves at a random FPS)
v=wiggle(5,50);
if(v < 50)v=0; if(v > 50)v=100;
vJumpy Wiggle 2 is similar to 1, but works at a defined FPS so your “jump” will happen at a regular pace.
// Jumpy Wiggle 2 (moves at a defined FPS)
fps=5; //frequency
amount=50; //amplitude
wiggle(fps,amount,octaves = 1, amp_mult = 0.5,(Math.round(time*fps))/fps);Inertial Bounce is like making your moves “rubbery.” Layers will overextend, then settle into place on position and rotation keyframes.
// 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 = .05;
freq = 4.0;
decay = 2.0;
value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);
}else{
value;
}Sometimes you just want something to move constantly without keyframing it. Use throw.
// Throw (move at a constant speed without keyframes)
veloc = -10; //horizontal velocity (pixels per second)
x = position[0] + (time – inPoint) *veloc;
y = position[1];
[x,y]Same as throw, but for rotation.
// Spin (rotate at a constant speed without keyframes)
veloc = 360; //rotational velocity (degrees per second)
r = rotation + (time – inPoint) *veloc;
[r]A shoutout to the brilliant folks at aenhancers.com who provided in whole or in part the basis for all of these expressions.
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16 Replies
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Thanks Chris!
-Andy
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very useful, thanks Chris
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Found very useful. Please illustrate how to use the following: –
Inertial Bounce is like making your moves “rubbery.” Layers will overextend, then settle into place on position and rotation keyframes.// 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 = .05;
freq = 4.0;
decay = 2.0;
value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);
}else{
value;
}Inertial Bounce is like making your moves "rubbery." Layers will overextend, then settle into place on position and rotation keyframes.// 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 = .05;
freq = 4.0;
decay = 2.0;
value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);
}else{
value;
} -
for Inertial Bounce, keyframe a shape layer changing direction, then alt click for expression, paste in code, the circle shape will stretch with centrifugal force to the other side back and forth. It’s useful for camera movements too if set low.
https://technicolorsoftware.hostzi.com/
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Thanks, Mr. Chris
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Thanks for these great time saving scripts!
Could anyone clarify how the variables freq, amp and decay work exactly? It seems like the higher the value of decay, the shorter the decay is? Any info would take some of the guess work out for script non-experts like myself 🙂
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It is an old but still GREAT topic!
I really love those expressions but it seems they dont work that well in CS6?What needs to be changed or updated?
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Can you be more specific? In what way are they not working?
Dan
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I have been using Jumpy Wiggle 2 without any issues in CS 6.
// Jumpy Wiggle 2 (moves at a defined FPS)
fps=5; //frequency
amount=50 //amplitude
wiggle(fps,amount,octaves = 1, amp_mult = 0.5,(Math.round(time*fps))/fps); -
In CS6 I’m having a new problem with the inertial bounce expression that I’ve used for a long time.
it only has a problem in AE CS6.Here is the expression
amp = .1;
freq = 1.0;
decay = 4.0;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){
v = velocityAtTime(key(n).time – thisComp.frameDuration/10);
value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);
}else{value}here is a screen cap of the error warning
it works sometimes and then other times it gives an error.
any input for a fix would be appreciated.amp = .1;
freq = 1.0;
decay = 4.0;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){
v = velocityAtTime(key(n).time - thisComp.frameDuration/10);
value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);
}else{value}
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