> For the complete documentation index, see [llms.txt](https://frangiordano96.gitbook.io/ae-expressions/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://frangiordano96.gitbook.io/ae-expressions/after-effects-school-of-fish.md).

# 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:

{% embed url="<https://www.youtube.com/watch?v=fWXND_1bfUI>" %}

Code for the position of the fish:

```javascript
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;
```