Noise channel node

Makes an irregular wave that never repeats, with values approximately in the range -1 to +1.

The Noise chop makes an irregular wave that never repeats, with values approximately in the range -1 to +1. It appears to have a period like the Wave chop, but it is not exact. It generates both smooth curves and noise that is random each sample. It uses the same math as the Noise Texture Operator.

Optionally, an input can be connected. It is assumed that the input contains 1 to 3 channels representing X, Y and Z coordinates of points in space, and are used to sample anywhere in 3D noise space. One index in the input produces one sample in the output.

Optional input: XYZ sample points

Normally the noise is sampled along the X-axis in an XYZ noise space. You can sample anywhere in XYZ.

Parameters

Noise

Type

The noise function used to generate noise.

Sparse	Produces high quality, continuous noise.
Hermite	Produces lower quality noise than Sparse, but quicker.
Harmonic Summation	Sparse noise with the ability to control the frequency step of the harmonics.
Brownian	Produces “Brownian” motion, similar to insect flight.
Random	Every sample is random and unrelated to any other sample. Also know as “white noise” in audio.

Seed

Any number, integer or non-integer. Each number generates completely different noise patterns, but with similar characteristics.

Period

The approximate separation between peaks of a noise cycle, expressed in Units.

Harmonics

The number of higher frequency components to layer on top of the base frequency.

Harmonic Spread

The factor by which the frequency of the harmonics are increased.

Roughness

The amount of the effect of the higher frequency harmonics.

Exponent

Pushes the noise values toward 0, or +1 and -1 (raising the noise to the this power).

Num of Integrals

The number of times to integrate Brownian noise, which affects its smoothness.

Amplitude

The noise’s amplitude.

Constraint

Normalize	Ensures that all noise curves fall between -1 and 1.
Constraint	Allows the noise curve to start and/or end at selected values. The average value may also be constrained.
Starting Value	The value noise curves should start at.
Ending Value	THe value noise curves should end at.
Mean Value	The mean value noise curves should have.

Channel

Channel Name	The names of the channels to be created.
Start	The start of the channels.
End	The end of the channels.
Sample Rate	The sample rate of the channels.
Extend Left	The left extend conditions of the channels.
Extend Right	The right extend conditions of the channels.
Default Value	The default value for extend conditions.

Locals

I	The current index.
C	The current channel (0 to NC-1).
NC	The total number of channels.
S,E	The start and end indices of the noise curve.

Examples

The following examples are specifically designed to demonstrate this node:

NoiseBasic

$HFS/mozilla/documents/examples/nodes/chop/noise/NoiseBasic.cmd

The following examples use this node:

Blend

$HFS/mozilla/documents/examples/nodes/chop/blend/Blend.cmd

ChannelBasic

$HFS/mozilla/documents/examples/nodes/chop/channel/ChannelBasic.cmd

Constant02

$HFS/mozilla/documents/examples/nodes/chop/constant/Constant02.cmd

CopyStamping

$HFS/mozilla/documents/examples/nodes/chop/copy/CopyStamping.cmd

Envelope

$HFS/mozilla/documents/examples/nodes/chop/envelope/Envelope.cmd