ARrrrrrgh.
I would have thought that VangleD( <0, 0, 0>, <8, 8, 0>) would return 45
degrees.
Instead it returns 90.
VangleD( <8, 0, 0>, <8, 8, 0>) returns 45 degrees.

So, it's not the angle between the "vectors" that it returns, but the angle
formed by the Vector described by the two points, and an axis?

I will pursue defining the details of this function when I'm done working on my
current scene, but G's.... Talk about unintuitive.

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