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Create larger or smaller sized noise detail. In other applications this parameter is sometimes referred to as "frequencywavelength".
Detail parameter from left to right: 2, 4, 8
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Octaves from left to right: 1,2,3. Detail level was kept at 3 and Persistance was kept at 1 for all renders.
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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)
PersistanceThis 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 noise pattern is largely unaffected, no matter how many octaves you specify.
Relationship between Octaves and PersistanceFrom the diagrams above it follows that:
In both of these cases, it is only the Detail parameter that will influence the look of the noise.
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