simplex-noise.js
simplex-noise.js is a fast simplex noise implementation in Javascript. It works in the browser and on nodejs.
Demos
- Simple 2D plasma on codepen.io.
- 3D voxel world generation example.
- Film grain in analog film emulator.
Install
npm install @amilajack/simplex-noiseUsage
By default simplex-noise.js will use Math.random() to seed the noise.
import SimplexNoise from '@amilajack/simplex-noise';
// initializing a new simplex instance
// do this only once as it is relatively expensive
const simplex = new SimplexNoise();
const value2d = simplex.noise2D(x, y);
const value3d = simplex.noise3D(x, y, z);
const value4d = simplex.noise4D(x, y, z, w);You can also pass in a seed string which will then be used to initialize the noise using the built in alea PRNG.
import SimplexNoise from '@amilajack/simplex-noise';
const simplex = new SimplexNoise('seed');
const value2d = simplex.noise2D(x, y);
const sameSeed = new SimplexNoise('seed');
const differentSeed = new SimplexNoise('different seed');
sameSeed.noise2D(x, y) === value2d
differentSeed.noise2D(x, y) !== value2dYou can also pass an alternative random function to the constructor that is used to build the permutation table. This can be used with a custom pseudo random number generator:
import SimplexNoise from '@amilajack/simplex-noise';
import Alea from 'alea';
const random = new Alea(seed);
const simplex = new SimplexNoise(random);
const value2d = simplex.noise2D(x, y);The ALEA PRNG can be found on in the npm package alea.
node.js
Node.js is also supported, you can install the package using npm.
const SimplexNoise = require('simplex-noise');
const simplex = new SimplexNoise(Math.random);
const value2d = simplex.noise2D(x, y);Benchmarks
For development you can open perf/index.html and watch the console or run node perf/benchmark.js in a shell.
There is also a rake task for comparing your current changes can also run make compare.
The command works using git stash.