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L-Systems.JS
============
A full, 3D L-Systems implementation in JavaScript
Syntax
------
- `F`: move one unit vector forward
- `+` / `-`: turn right / left by angle `alpha`
- `&` / `^`: pitch up / down by angle `alpha`
- `<` / `>`: roll right / left by angle `alpha`
- `|`: reverse vector direction
- `[` / `]`: push / pop current tree state
Usage
-----
```js
var lsys = new LSystem('F', { 'F' : 'F-F+FF' });
var tree = lsys.iterate(2);
console.log(tree) // F-F+FF-F-F+FF+F-F+FFF-F+FF
```
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