PSeitz / rust_simplex_noise

Perlin Simplex Noise Rust Implementation (2D, 3D)

About Perlin's "Simplex" Noise

• Perlin's "Classic" Noise (1984) is an algorithm producing pseudo-random fluctuations simulating natural looking variations, producing paterns all of the same size. It is a kind of gradiant-noise algorithm, invented by Ken Perlin while working on visual special effects for the Tron movie (1982). It works by interpolating pseudo-random gradiants defined in a multi-dimensionnal grid. Ken Perlin original references
• Perlin's "Improved" Noise (2002) switches to a new interpolation fonction with a 2nd derivative zero at t=0 and t=1 to remove artifacts on integer values, and switches to using predefined gradients of unit lenght to the middle of each edges. Ken Perlin original references
• Perlin's "Simplex" Noise (2001) rather than placing each input point into a cubic grid, based on the integer parts of its (x,y,z) coordinate values, placed them onto a simplicial grid (think triangles instead of squares, pyramids instead of cubes...) Ken Perlin original references

Coherent noise

A coherent noise is a type of smooth pseudorandom noise with following properties:.

• same input will always return the same output.
• small change of the input will produce small change of the output.
• large change of the input will produce random change of the output.

Code attribution

This Rust implementation is based on the speed-improved Java version 2012-03-09 by Stefan Gustavson (original Java source code in the public domain). http://webstaff.itn.liu.se/~stegu/simplexnoise/SimplexNoise.java:

• Based on example code by Stefan Gustavson ([e-mail]).
• Optimisations by Peter Eastman ([e-mail]).
• Better rank ordering method by Stefan Gustavson in 2012.

Simplex noise demystified, Stefan Gustavson, Linköping University, Sweden ([e-mail]), 2005-03-22

License

Distributed under the MIT License (MIT)