Noise

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

• Perlin noise
• Simplex noise
• Worley noise

• Computer Graphics