Perlin noise implementation


This is a simple library for 2d & 3d perlin noise and simplex noise in javascript. Noise is pretty.

The library is pretty fast (10M queries / sec). But its still way slower than using a shader. For example, if you try and update an entire screen's worth of pixels, it'll be slow.

The code is based on Stefan Gustavson's implementation. Do whatever you want with it, etc.

// value passed into the constructor is used as a seed 
var noise = new Noise(Math.random());
for (var x = 0; x < canvas.width; x++) {
  for (var y = 0; y < canvas.height; y++) {
    // noise.simplex2 and noise.perlin2 return values between -1 and 1. 
    var value = noise.simplex2(x / 100, y / 100);
    image[x][y].= Math.abs(value) * 256; // Or whatever. Open demo.html to see it used with canvas. 

The library exposes a constructor function called Noise with the following instance methods:

  • simplex2(x, y): 2D Simplex noise function
  • simplex3(x, y, z): 3D Simplex noise function
  • perlin2(x, y): 2D Perlin noise function
  • perlin3(x, y, z): 3D Perlin noise function
  • seed(val): Seed the noise functions. Only 65536 different seeds are supported. Use a float between 0 and 1 or an integer from 1 to 65536.