Orientation_OrientationVectorRadians class

OrientationVector containing ox, oy, oz, theta represents an orientation vector Structured similarly to an angle axis, an orientation vector works differently. Rather than representing an orientation with an arbitrary axis and a rotation around it from an origin, an orientation vector represents orientation such that the ox/oy/oz components represent the point on the cartesian unit sphere at which your end effector is pointing from the origin, and that unit vector forms an axis around which theta rotates. This means that incrementing/decrementing theta will perform an in-line rotation of the end effector. Theta is defined as rotation between two planes: the plane defined by the origin, the point (0,0,1), and the rx,ry,rz point, and the plane defined by the origin, the rx,ry,rz point, and the new local Z axis. So if theta is kept at zero as the north/south pole is circled, the Roll will correct itself to remain in-line.