Perlin noise is ubiquitous in modern CGI. Used for procedural texturing, animation, and enhancing realism, Perlin noise has been called the "salt" of procedural content. Perlin noise is a type of gradient noise, smoothly interpolating across a pseudo-random matrix of values.

The noise library includes native-code implementations of Perlin "improved" noise and Perlin simplex noise. It also includes a fast implementation of Perlin noise in GLSL, for use in OpenGL shaders. The shader code and many of the included examples require Pyglet (http://www.pyglet.org), the native-code noise functions themselves do not, however.