Perlin's noise function & co.
Perlin's noise function & co. This package contains various functions useful for procedural texturing.
Note by Tjl: This code has been taken from the CD distributed with Texturing&Modeling 2nd edition. Ken Perlin also distributes this on his home page. No license has been specified in this code or on the web page, so I'm assuming it's freely distributable and including it here. If this is not the case, please inform me and I will remove it promptly.
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