How do I find a quaternion, whose direction is strictly between two given quaternions? In 2D space was simple: (directionA + directionB) / 2, but the conditions were by then what area of the axis is used - left or right (if we talk about the degree measure of the angle). In addition quaternions no function or division.
For Simplified problem, I can say that one quaternion will always look on the axis X (in the inspector is the angle (0, 0, 0)). The second will change. A quaternion is required to be always in the middle between the two quaternions.
In the image you want me to quaternion (red) is strictly between quaternions A and B in space.