Simplex 2D / 3D in Rust

Provides basic 2D and 3D simplex noise functions.

• https://en.wikipedia.org/wiki/Simplex_noise

This Rust version is ported from the public domain Java implementation described here:

Simplex noise demystified Stefan Gustavson, Linköping University, Sweden (stegu@itn.liu.se), 2005-03-22

• https://github.com/stegu/perlin-noise/blob/master/simplexnoise.pdf

• https://web.archive.org/web/20210506195658/http://weber.itn.liu.se/~stegu/simplexnoise/SimplexNoise.java

Usage

use simplex_23d::Simplex;

let seed: u64 = 42;
let noise = Simplex::new(seed);

// 2d noise
let value: f32 = noise.sample2d(1.0, 1.0);

// 3d noise
let value: f32 = noise.sample3d(1.0, 1.0, 1.0);

The Simplex object generates a permutation table using the rand crate from the given seed value. For frequency, you'd just multiply it with the input coordinate:

let freq: f32 = 0.001234;
let x: f32 = 1.0 * freq;
let y: f32 = 1.0 * freq;
let value: f32 = noise.sample2d(x, y);

Visualizations

Changelog

• 0.2.1 fix perm_mod12 optimization
• 0.2.0 updated readme
• 0.1.0 initial release