There is a quaternion is to prevent gimbal lock
It indicates that the presence of a separate rotation state, and rotation property of the transform as
If the quaternion multiplication quaternion rotation operation superposition
Common attribute identity, indicating that the object is not rotating
Properties and methods common
identity of the quaternion non-rotating, the code used to create the object
LookRotation create a rotating, along the forward (z-axis) and the head restraint along a gaze upwards (y-axis)