Rasagar/Library/PackageCache/com.unity.terrain-tools/Documentation~/snippets/domain-settings.md

The domain settings alter the controls for each noise type.

Property	Description
Noise Type	There are five noise patterns that you can select. • Billow is similar to Perlin noise, but with more rounded features that resemble natural phenomena, such as treetops and hills. • Perlin is a noise where the visual details are the same size. This is good for close-up mountain details. • Ridge is billow noise filtered through an absolute function that is then inverted. This is good for ridges and deep valleys. • Value is a noise that creates a lattice of points, which are assigned random values. The noise function then returns an interpolated number based on the values of the surrounding lattice points. This is good for close up mountain details. • Voronoi is a Worley derivative noise that comes close to simulating textures of stone, water, or biological cells.
Fractal Type	There are three options that you can select. • Fbm, which stands for fractal Brownian motion. This is good for mountainous shapes. • Strata is an n-dimensional noise fed into one-dimensional Gradient noise. This is good for natural banding like in marble, tree rings, and terraces. • None turns off all the noise modifier options, resulting in the raw output of the Noise Type function you select.
Strata Offset	This property only appears if you set the Fractal Type to Strata. Unity applies this vertical offset value to the strata.
Strata Scale	This property only appears if you set the Fractal Type to Strata. Unity applies this multiplier to the strata. Higher Strata Scale values produce more banding.
Octaves	The number of iterations of noise to layer together. Each octave is a layer of noise applied on top of the current accumulation of octaves, and each layer has different Amplitude and Frequency factors. Generally, each subsequent octave is smaller in scale and magnitude than the previous octave. This adds finer and finer details to the combined noise signal at each octave.
Amplitude	The unmodified multiplier of the output of each octave of noise.
Persistence	The scaling factor to apply to the Amplitude at each octave.
Frequency	The feature size of the noise domain space at the first octave.
Lacunarity	The scaling factor to apply to the Frequency at each octave.