Perlin Noise

Menu Path : Operator > Noise > Perlin Noise

The Perlin Noise Operator allows you to specify coordinates to sample a noise value within a specified range in one, two, or three dimensions. Perlin noise is a type of gradient noise which has a good distribution of values which makes it rarer to have similar adjacent values.

You can use this Operator to introduce variety to your particle attributes. A common use case is to use each particle’s position as a coordinate to sample the noise to output a new color, velocity, or position value.

Operator settings

Property	Type	Description
Dimensions	Enum	Specify whether the noise is one, two, or three dimensional.
Type	Enum	Specify what type of noise to use.

Operator properties

Input	Type	Description
Coordinate	Float Vector2 Vector3	The coordinate in the noise field to sample from. The Type changes to match the number of Dimensions.
Frequency	Float	The period in which Unity samples the noise. A higher frequency results in more frequent noise change.
Octaves	Int	The number of layers of noise. More octaves create a more varied look but are also more resource-intensive to calculate.
Roughness	Float	The scaling factor Unity applies to each octave. Unity only uses roughness when Octaves is set to a value higher than 1.
Lacunarity	Float	The rate of change of the frequency for each successive octave. A lacunarity value of 1 results in each octave having the same frequency.
Range	Vector2	The range within which Unity calculates the noise. The noise stays between the X and Y value you specify here, where X is the minimum and Y is the maximum.

Output	Type	Description
Noise	Float	The noise value at the coordinate you specify.
Derivatives	Float Vector2 Vector3	The rate of change of the noise for every dimension. The Type changes to match the number of Dimensions.