A demo of Processing's built-in Perlin Noise function.
Move the mouse over the image to scroll thru the shifting clouds.
This is a fairly simple program that also demonstrates how to map a value to an HSB color ramp.
Note that the y value (vertical) controls the hue, while the noise value controls the saturation and brightness.
Unfortunately, Perlin noise is expensive to calculate, so you can't use this technique for very large sketches without a big drop in frame-rate.
Oh, that naughty sketch! Please let us know what the issue is below.
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