Billow Noise

generator.billow · Generators

Puffy, rounded mounds and dunes, the rounded inverse of ridged noise.

Purpose

Puffy, rounded mounds, the soft counterpart to ridged noise. Multiply it with a shape envelope to place rolling hills or a dune field.

Inputs

This node takes no inputs.

Outputs

• out

Parameters

Parameter	Type	Range	Default	Unit	Description	Field-driven
Wavelength (wavelength)	float	[0, 100000]	512	m	The distance from one crest to the next, in world units. On a noise generator it is the size of the largest features.	no
Octaves (octaves)	int	[1, 12]	5		The number of noise layers summed together; more octaves add finer detail.	no
Lacunarity (lacunarity)	float	[1, 4]	2		How much finer each octave is than the one before it; higher values widen the gap between coarse and fine detail.	no
Gain (gain)	float	[0, 1]	0.5		How much each finer octave contributes; higher values make the fine detail rougher and more pronounced.	no
Seed (seed)	int	[0, 2147483647]	0		The random seed; changing it regenerates a different variation of the same pattern.	no
Offset X (offset_x)	float	[-100000, 100000]	0	m	Slides the sampling window along the X axis, in world units, to take a different patch of the pattern without changing its shape.	no
Offset Y (offset_y)	float	[-100000, 100000]	0	m	Slides the sampling window along the Y axis, in world units, to take a different patch of the pattern without changing its shape.	no

Layer contract

Reads and writes the height layer.

Behaviour

Wavelength is a real size. A 500 m feature stays 500 m when the world extent changes, so growing the world gives you more ground at the same scale rather than the same terrain stretched over it.