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
Oh, that naughty sketch! Please let us know what the issue is below.
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