~~NOTOC~~
====== Noise ======

<WRAP right>
<figure center|fig1>
{{:article:worley_simple.png?150|}}
<caption>An render of 2D Worley noise</caption>
</figure>
</WRAP>

Noise, simply put, is a random signal. There are numerous approaches to creating noise, but we are most interested in creating coherent noise. Coherent noise refers to smooth, pseudo-random noise produced by a //coherent-noise function//.

A coherent-noise function has three main properties:

  * There is a 1:1 mapping between input values and output values (i.e. the same input will always produce the same output)
  * Small changes in input produce small changes in output
  * Large changes in input produce random changes in output

==== Notable Examples ====
  * [[article:perlin_noise|Perlin noise]]
  * [[article:simplex_noise|Simplex noise]]
  * [[article:worley_noise|Worley noise]]

==== See also ====
  * [[article:computer_graphics|Computer Graphics]]