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Mihai Iliuta

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Excerpt

To better visualize how the Octave parameter affects the noise pattern, lets look at it through a 2D cross section:

 

5 octaves of noise shown individually, and then added together to form the final noise. Notice how the final noise retains some of its original shape from the first octave (in this case a medium Persistance was used, see below)

 

Persistance

This parameter controls how "persistant" the noise is through each octave. With a high setting, the initial noise pattern quickly disappears, while the frequency of the noise increases:

Example of using 5 octaves, and a high Persistance such as 0.9 -notice in the result how the initial noise pattern is not really present anymore because of the high frequency/small wavelength noise

 

On the other hand, if the Persistance is very low, the noise pattern will dissipate very quickly with each octave:

Still using 5 octaves, but a small Persistance such as 0.1 - notice how the initial and final noise
pattern is largely unaffected
patterns are largely the same, no matter how many octaves you specify.

 

Info

Relationship between Octaves and Persistance

From the diagrams above it follows that:

  • If you set the number of Octaves to 1, the Persistance parameter does not matter anymore.
  • If you set the Persistance value to 0 (or extremely low), the Octaves parameter does not matter anymore.

In both of these cases, it is only the Detail parameter that will influence the look of the noise.

 

 

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