Say I have a centre of rotation at C(x, y, 1 <= z <= 1.5). I need to define a unit normal vector to this. I know it's a length of 1 and this means there's a sphere of radius 1 at the origin so I can get the beginnings of a spherical coordinate system, but I'm a little unclear on how to work that out from there as I don't have the angle or elevation or whatever.

Some advice would be appreciated!

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