Quaternion4d
Quaternion – the group of rotations about a fixed point in four-dimensional Euclidean space.
Parameters:
- cX, cY, cZ, cW: real – coordinates of quaternion 
Methods:
- Init – create quaternion object 
- q_mul_q – get dot product of quaternions 
- q_x_q – get vector product of quaternions 
- s_x_q – scale quaternion coordinates 
- q_add_q – add quaternion 
- q_sub_q – subtract quaternion