Turbulence

This Turbulence node takes a list of Vectors and outputs a list of equal length containing Floats in the range 0.0 to 1.0. May output scalars or vectors. For some noise types, if your output goes to the texture viewer you need to remap them, otherwise your texture will be supersaturated or undersaturated. See below ‘range table’ for a detailed description.

Inputs & Parameters

Parameters	Description
Noise Function	Pick between Scalar and Vector output
Noise Type	Pick between several noise types Blender Cell Noise New Perlin Standard Perlin Voronoi Crackle Voronoi F1 Voronoi F2 Voronoi F2F1 Voronoi F3 Voronoi F4 See mathutils.noise docs ( Noise )
Octaves	Accepts integers values The number of different noise frequencies used.
Hard	Accepts bool values: Hard( True ) or Soft( False ) Specifies whether returned turbulence is hard (sharp transitions) or soft (smooth transitions).
Amplitude	Accepts float values. The amplitude scaling factor.
Frequency	Accepts float values. The frequency scaling factor.

Range table

Scalar values from turbulence node with size(n.verts)=64x64, step=0.05, octaves=3, amplitude=0.5, frequency=2.0, random seed=0. Plug a map range node in the scalar output and map it to the desired range (min=0, max=1) as in the image below.

Noise Type	median	maximum	minimum
Blender	0.4574402868747711	1.2575798034667969	0.0
Stdperlin	0.37063807249069214	0.972740530967712	0.0
Newperlin	0.2982039898633957	0.7674642205238342	0.0
Voronoi_F1	0.5178706049919128	1.184566617012024	0.016996487975120544
Voronoi_F2	0.9441720247268677	1.696974754333496	0.07561451196670532
Voronoi_F3	1.3248268961906433	2.267115831375122	0.24465730786323547
Voronoi_F4	1.6119314432144165	2.4261345863342285	0.7868537306785583
Voronoi_F1F2	1.0320665836334229	1.7262239456176758	0.06919857859611511
Voronoi_Crackle	1.5918831825256348	1.75	0.12337762117385864
Cellnoise	0.9668738842010498	1.5000858306884766	0.1691771298646927

Examples

Basic example with a Scalar output and Vector rewire node.

Notes

This documentation doesn’t do the full world of fractals any justice, feel free to send us layouts that you’ve made which rely on this node.

Links

Fractals description from wikipedia: https://en.wikipedia.org/wiki/Fractal

A Perlin Noise and Turbulence description by Prof. Paul Bourke: http://paulbourke.net/texture_colour/perlin/

An introduction on Noise and Turbulence by Dr. Matthew O. Ward: https://web.cs.wpi.edu/~matt/courses/cs563/talks/noise/noise.html

A very interesting resource is “the book of shaders”, it’s about shader programming but there is a very useful fractal paragraph:

http://thebookofshaders.com/13/ and on github repo: https://github.com/patriciogonzalezvivo/thebookofshaders/tree/master/13