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NightSky3D (Freely rotating camera example)

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This is a simple example of how to use a PMatrix3D to look around in all directions using the mouse. I found this sort of camera orientation difficult to come up with on my own. I hope this will save someone a bunch of time! It also incorporates a method for placing random points on a sphere. Another somewhat difficult task to come up with through reasoning alone, unless you're good with trig. :P
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