imclab/noisejs

Javascript 2D Perlin & Simplex noise functions

NOISE!

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.

How to make noise:

noise.seed(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].r = Math.abs(value) * 256; // Or whatever. Open demo.html to see it used with canvas.
  }
}

The library exposes an object called noise with the following properties:

• 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.