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Fast Noise Node Introduction
The Fast Noise node is a very fast and flexible Perlin Noise generator. It can be useful for a wide range
of effects, from clouds, to swirling fog, waves, water caustics, stylized fire, and smoke, and other
organic textures. It is also invaluable as a noise source for other effects, such as heat shimmers,
particle systems, and dirtiness maps.
Inputs
The two map inputs on the Fast Noise node allow you to use masks to control the value of the noise
detail and brightness controls for each pixel. These two optional inputs can allow some interesting and
creative effects. There is also a standard effect mask input for limiting the Fast Noise size.
– Noise Detail Map: A soft-edged mask connected to the gray Noise Detail Map input will give
a flat noise map (zero detail) where the mask is black, and full detail where it is white, with
intermediate values smoothly reducing in detail. It is applied before any gradient color mapping.
This can be very helpful for applying maximum noise detail in a specific area, while smoothly
falling off elsewhere.
– Noise Brightness Map: A mask connected to this white input can be used to control the noise
map completely, such as boosting it in certain areas, combining it with other textures, or if Detail
is set to 0, replacing the Perlin Noise map altogether.
– Effect Mask: The optional blue effect mask input accepts a mask shape created by polylines,
basic primitive shapes, paint strokes, or bitmaps from other tools. Connecting a mask to this
input limits the Fast Noise to only those pixels within the mask.
Basic Node Setup
The Fast Noise node is used to generate images for other nodes to take advantage of. For example,
below the Fast Noise node is used as a bitmap source in the Particle Emitter.
A Fast Noise node used as a bitmap source for a Particle Emitter
Inspector
Fast Noise controls
Chapter 103Generator Nodes 1968
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