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https://github.com/mysterypancake/after-effects-fun
Expressions, scripts and projects for Adobe After Effects
https://github.com/mysterypancake/after-effects-fun
adobe adobe-after-effects after-effects fun html javascript js jsx
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Expressions, scripts and projects for Adobe After Effects
- Host: GitHub
- URL: https://github.com/mysterypancake/after-effects-fun
- Owner: MysteryPancake
- License: mit
- Created: 2020-09-24T11:53:25.000Z (over 4 years ago)
- Default Branch: master
- Last Pushed: 2024-05-28T12:49:39.000Z (7 months ago)
- Last Synced: 2024-05-29T04:24:13.131Z (7 months ago)
- Topics: adobe, adobe-after-effects, after-effects, fun, html, javascript, js, jsx
- Language: JavaScript
- Homepage: https://mysterypancake.github.io/After-Effects-Fun/
- Size: 10.6 MB
- Stars: 41
- Watchers: 5
- Forks: 5
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# After Effects Fun
Expressions, scripts and projects for Adobe After Effects.
Usually created by myself or others on the [/r/AfterEffects Discord](http://discord.gg/aftereffects).
## Projects
These were made using [custom exploits](#break)!
[Playable Pong (JavaScript only)](projects/PONG)
[
](https://youtu.be/3HMT1M9F5yA)
[Drawing (JavaScript only)](projects/DRAW)
[
](https://youtu.be/XxiwhegTduI)
## Expressions
[Limitless linear](expressions/linear.js)
[
](expressions/linear.js)
[Custom easings](expressions/easing2.js)
[
](https://youtu.be/6qnkLmMJ2AE)
[](https://youtu.be/jy5WZwaGMhY)
[Spring easing](expressions/easing4.js)
[
](expressions/easing4.js)
[Path rotation](expressions/pathRotation.js)
[](https://youtu.be/_G5AHLrX-jU)
[Spiral path](expressions/spiralPath.js)
[
](expressions/spiralPath.js)
[Camera snapping](expressions/cameraSnap.js)
[](https://youtu.be/VJOOgkROCwU)
## Tools
[Image to expression converter](https://mysterypancake.github.io/After-Effects-Fun/tools/imagetoexpression)
[](https://youtu.be/sEwBKQni7kU)
[](https://youtu.be/OfXQXMyMp-U)
**WARNING: These are all unpredictable to work with!**
To have fun in After Effects, I often need to store data in memory and share it between expressions.
Often this is considered impossible, but there are several ways to do it:
### 1. Variable Leaking (JavaScript only)
I discovered variable names aren't properly deleted by After Effects:
```javascript
// Write a variable named "leak"
var leak = 5;
// Read all variable names
Object.keys(this); // ["leak"] (among others)
```
Variable names are shared between all expressions, and remain in memory until After Effects is restarted.
[`Object.keys(this)`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys) reads variable names, but not values. Therefore to store values, I put them in the name itself:
```javascript
// Write a variable named "leak_5"
var leak_5;
```
[`eval()`](https://www.w3schools.com/jsref/jsref_eval.asp) allows dynamic variable names:
```javascript
// Write any variable name you want
const name = "hello";
eval(`var ${name}`);
```
To tell whether a variable is built-in, you can add a prefix:
```javascript
// Add a "leak_" prefix to identify custom variables
const data = "hello";
eval(`var leak_${data}`);
```
```javascript
// Read all variable names
Object.keys(this); // ["leak", "leak_5", "hello", "leak_hello"] (among others)
```
Using this concept, you can store multiple types of data in one variable name:
```javascript
// Write 2 values into a single name
const writeX = 5;
const writeY = "hi";
eval(`var leak_${writeX}_${writeY}`);
```
```javascript
// Read values by splitting
const parts = Object.keys(this).pop().split("_"); // ["leak", "5", "hi"]
const readX = parseInt(parts[1]); // 5
const readY = parts[2]; // "hi"
```
You can delete variable names like so:
```javascript
// Delete variable named "leak_5_hi"
delete leak_5_hi;
```
[Many characters aren't allowed in variable names](https://www.dummies.com/web-design-development/javascript/naming-javascript-variables/), so [you have to be creative](projects/PONG/PONG.js#L92-L100).
### 2. The Debug Object (JavaScript + ExtendScript)
[@stibinator](https://github.com/stibinator) [told me](https://blob.pureandapplied.com.au/the-global-object-in-after-effects/) about the [debug object `$`](https://helpx.adobe.com/cy_en/after-effects/using/legacy-and-extend-script-engine.html#dollar-object).
`$` is shared between all expressions, and remains in memory until After Effects is restarted.
```javascript
// Write number
$.leak = 5;
// Read number
$.leak; // 5
```
[`Object.keys`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys) works on `$`:
```javascript
// Read all keys
Object.keys($); // [{ leak: 5 }] (among others)
```
`$` allows any type of data to be stored:
```javascript
// Write complex data
$.leak2 = [
{
name: "Jeff",
age: 20
},
{
name: "Joe",
age: 1
}
];
// Read complex data
$.leak2; // [{ name: "Jeff", age: 20 }, { name: "Joe", age: 1 }]
```
`$` allows custom keys:
```javascript
// Write using a custom key
const key = "leak3";
$[key] = 123;
// Read using a custom key
$[key]; // 123
```
`$` also works in ExtendScript, but `Object.keys` doesn't.
### 3. Environment Variables (ExtendScript only)
I discovered ExtendScript has a method which [sets environment variables](https://extendscript.docsforadobe.dev/extendscript-tools-features/dollar-object.html#setenv):
```javascript
$.setenv(key, value);
```
However it only writes string values:
```javascript
$.setenv("leak", 5);
$.getenv("leak"); // "5"
```
### Summary
|Exploit|Engine|Get|Set|Capable of storing|
|:---|:---|:---|:--|:--|
|Variable leaking|JavaScript|`Object.keys(this)`|```eval(`var ${value}`)```|Strings (excluding special characters)|
|The debug object|Both|`$.key`|`$.key = value`|Anything|
|Environment variables|ExtendScript|`$.getenv(key)`|`$.setenv(key, value)`|Strings|