Align two cameras to a fixed position
Hello. I am going crazy with this problem since days and I really need someone to help me or to point me to the right direction.
I have two cameras pointing to an object. The camera are placed around a unit sphere. In the picture, the two blue and green spheres (the big ones, ignore all the other smaller spheres). 
The cameras are placed in this way. The green camera is placed anywhere on the unit sphere. The blue one is placed anywhere WITHIN A CERTAIN ANGLE from the first one, e.g. between +-45 degrees. The angle is aligned with the world horizontal plane.
Now , I would like to get the position of the green and blue cameras, and represent their relative position with respect to a standard point on the unit sphere. That is, the green camera is always represented by a = [1, 0, 0] on the sphere, and the blue camera is represented by a point b that is placed at a position that somehow reflects the rotation between the green and the blue camera. E.g. if it was 45 degrees with the green camera, I want a=[1, 0, 0] and b to be 45degrees (around some axes) with respect to a. Any idea?
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