This is a Unity shader library that contains several gradient noise functions.
From webgl-noise written by Stefan Gustavson and Ahima Arts:
https://github.com/ashima/webgl-noise
- Classic Perlin noise (2D/3D)
- Periodic Perlin noise (2D/3D)
- Simplex noise (2D/3D)
- Analytical derivatives of simplex noise (2D/3D)
From K.jpg's SuperSimplex & FastSimplex repository:
https://github.com/KdotJPG/New-Simplex-Style-Gradient-Noise
- SuperSimplexNoise (3D)
- FastSimplexStyleNoise (3D)
The former ones are released under the MIT license, and the latter ones are public domain (Unlicense). Please check the header comments for details.