nlerp
Performs Normalized Linear Interpolation (Nlerp) between two quaternions, start and endInput, using the interpolation factor tOriginal. This method is suitable for efficiently interpolating 3D rotations.
nlerp is generally faster than Slerp but does not guarantee constant angular velocity. It's a good approximation, especially for small rotational differences.
Return
A new unit Quat representing the normalized linear interpolation.