I have 3 points, p1,p2,p3

p1 = Camera location
p2 = Camera look_at
p3 = 1 unit above camera location, relative to desired orientation of camera

To restate, if the camera was straight and level at the origin, looking
along +z, the values would be.

p1 = <0,0,0>
p2 = <0,0,1>
p3 = <0,1,0>

However, these 3 points are going through some rather complex rotations, and
I need to figure out how to 'lock' the camera into it.

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