Noise Functions
Portability Note: Built-in noise functions are not reproducible from platform to platform. Verify their support and appearance on all platforms you care about.
Noise functions can be used to increase visual complexity. Values returned by the following noise functions give the appearance of randomness but are not random. Rather, they give the same result for the same input, allowing reproduction of the same variance from frame to frame.
The noise functions below are defined to have the following characteristics:
• The return value(s) are always in the range [–1.0, 1.0], and cover at least the range [–0.6, 0.6], with a Gaussian-like distribution.
• The return value(s) have an overall average of 0.0.
• They are repeatable, in that ...
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