Brownian Noise

Brownian Noise

Features ›› Procedural Nodes ›› Noise Nodes ›› FBM ››
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Brownian Noise by Miguel A Santiago Jr









Brownian Noise is part of the family of Brownian Motion Noises which distinguish themselves by their very high frequency detail


Samples



Options



Color


The two colors that make up the final look of the procedural

Size


Size of fractal features on your model


Low (left) and very high (right) frequency Brownian Noise


A random start value for your fractal.

Changing the seed changes the overall look of your fractal while the general feature look stays the same,

allowing for quick variation with a general look theme.


Modifiers





Understanding Noise terminology


For some background information on the terms below please refer to

Understanding some basic noise terms



Describes the level of detail of the noise. Detail is created by encapsulating the modifiers below into a loop and

running it multiple times incrementing the values from loop to loop.



Controls the size of the secondary fine details.



The amount to multiply the noise's amplitude by for each octave

The amplitude is hardcoded for this noise to start at 1.0 for the first octave,

then gets multiplied by the Gain 1x time for each octave incrementing the value of the amplitude


Defines the Value at which point the noise will be tipped towards color A (values to the left of the set slider value)

or color B (values to the right of the set slider value).


Clamps the noise calculation to a 0-1 range.

Color A/B are applied after the Clamping, so you can still set values above 1 if you choose to

however by clamping the Noise calculation the color mixing between the two colors works more

reliably. In general this should be left on.


Inverts the result of the noise. Inversion is done before color A and B are applied.


Space


By default this procedural is generated in 3D World Space. This results in a seamless noise across UV seams.

By turning on UV Space the procedural is generated based on your UVs, resulting in seams between UV tiles/UDIM & uv shells.


Utilizing Transform Controls such as Scale (see below) you can apply a non-uniform transform to the procedural

to make use of specific UV layouts

Transform Scale


Will apply a scale along X,Y or Z to your noise. This is useful for creating patterns like woodgrain, drips etc.

When UV Space is turned on Scale Z is ignored.

Transform Rotate


Will apply a rotation in X,Y or Z to your noise. When UV Space is turned on Rotate X & Rotate Y are ignored

and rotation is done around the center of each UV Tile/UDIM using Rotate Z.

Transform Translate


Will apply an offset in X,Y or Z to your noise. When UV Space is turned on Translate Z is ignored.



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