5 After Effects Expressions you need

vfxshare

Member
Sep 13, 2019
29
1
6
Bounce
First create an animation (ie. scale 100 to 120% or position from left to right). Next apply bellow’s expression to the property you’ve key-framed to make the animation bounce.
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);
amp = .06;
freq = 3;
decay = 5.0;
value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);
}else{
value;
}
Wiggle
Can be applied to any property, but works great on the position to create a natural camera movement.
wiggle(1,50);
Squash and Stretch
Apply it to the scale attribute of any object. Works best on icons or bullet points.
maxDev = 13; // max deviation in pixels
spd = 30; //speed of oscillation
decay = 1.0; //how fast it slows down
t = time - inPoint;
x = scale[0] + maxDev*Math.sin(spd*t)/Math.exp(decay*t);
y = scale[0]*scale[1]/x;
[x,y]
Motion Tail
First animate the position of an object. Then apply bellow’s expression to the position:
delay = 5; //number of frames to delay
d = delay*thisComp.frameDuration*(index - 1);
thisComp.layer(1).position.valueAtTime(time - d)

And this code to the opacity:
opacityFactor = .75;
Math.pow(opacityFactor,index - 1)*100
Now simply duplicate that entire layer (CTRL + D / CMD +D) a couple of times.
Timer Up or Down
Create a text layer and apply the expression to the source text attribute.
//Define time values
var hour = Math.floor((time/60)/60);
var min = Math.floor(time/60);
var sec = Math.floor(time);
var mili = Math.floor(time*60);
// Cleaning up the values
if (mili > 59){ mili = mili - sec*60; }
if (mili < 10){ mili = "0" + mili; } if (sec > 59){ sec = sec - min*60; }
if (sec < 10){ sec = "0" + sec; } if (min >= 59){ min = min - hour*60; }
if (min < 10){ min = "0" + min; }
// no hour cleanup
if (hour < 10){ hour = "0" + hour; }
//Output
hour + ' : ' + min + ' : ' + sec + ' : ' + mili;
VideoBlocks