simplex-noise

simplex-noise.js

simplex-noise.js is a fast simplex noise implementation in Javascript. It works in the browser and on nodejs.

Requirements

It requires typed arrays, if you want to use it in browsers without support you will need to use a polyfill like typedarray.js.

Demo

Simple 2D plasma demo on jsfiddle.net.

Usage

// initializing a simplex instance
// do this only once it's relatively expensive
var simplex = new SimplexNoise(),
    value2d = simplex.noise2D(x, y),
    value3d = simplex.noise3D(x, y, z),
    value4d = simplex.noise2D(x, y, z, w);

You can also pass an alternative random function to the constructor that is used to build the permutation table:

var simplex = new SimplexNoise(Math.random),
    value2d = simplex.noise2D(x, y);

node.js

Node.js is also supported, you can install the package using npm.

var SimplexNoise = require('simplex-noise'),
    simplex = new SimplexNoise(Math.random),
    value2d = simplex.noise2D(x, y);

Benchmarks

• Comparison between 2D and 3D noise
• Comparison with simplex implementation in three.js

Tests

There are some simple buster.js tests for this library to run them first install buster.js and jshint:

npm install buster.js
# if you haven't done so already
npm install -g jshint
make tests

Changelog

2.1.1

• Increased entropy by fixing a little initialization issue.

2.1.0

• AMD support

2.0.0

• Changed node.js api, SimplexNoise is now exported directly.
• Added unit tests

1.0.0

• Initial Release

Credits

This is mostly a direct javascript port of the Java implementation by Stefan Gustavson and Peter Eastman.