noise

float  noise(float pos)

vector  noise(float pos)

Sample one or three numbers at the given position from 1D noise.

float  noise(float posx, float posy)

vector  noise(float posx, float posy)

Sample one or three numbers at the given position from 2D noise.

float  noise(vector pos)

vector  noise(vector pos)

Sample one or three numbers at the given position from 3D noise.

float  noise(vector4 pos)

vector  noise(vector4 pos)

Sample one or three numbers at the given position from 4D noise.

There are two forms of Perlin-style noise: a non-periodic noise which changes randomly throughout N-dimensional space, and a periodic form which repeats over a given range of space.

Note This function generates non-periodic noise. Use the pnoise function to generate periodic Perlin noise.

The various functions return the noise value at a 4D (vector4 argument), 3D (vector argument), 2D (two float arguments) or 1D (float argument) position. You can get a random float value or a vector of three random values.

The noise is in the range 0-1 with a median of 0.5. The distribution of the noise depends on the dimension, with higher dimensions approaching a Gaussian distribution of noise values.