After Effects - School of Fish

Here you'll find the tutorial and expressions for the School of Fish Animation. This animation uses a combination of valueAtTime() and random() Expressions.

Full Tutorial:

Code for the position of the fish:

var timeDisp = thisComp.layer("CONTROLLER").effect("time displacement")("Slider");
var xDisp = thisComp.layer("CONTROLLER").effect("xDisp")("Slider");
var yDisp = thisComp.layer("CONTROLLER").effect("yDisp")("Slider");
var zDisp = thisComp.layer("CONTROLLER").effect("zDisp")("Slider");

seedRandom(thisComp.layer("CONTROLLER").effect("seed")("Slider"), timeless = true);

var myTimeDisp = random(0, timeDisp);
var myXDisp = random(-xDisp, xDisp);
var myYDisp = random(-yDisp, yDisp);
var myZDisp = random(-zDisp, zDisp);
var posDisp = [myXDisp, myYDisp, myZDisp];

thisComp.layer("CONTROLLER").transform.position.valueAtTime((time - myTimeDisp)) + posDisp;