Quaternion class

Quaternion is usually used to perform rotation in computer graphics.

The Quaternion type exposes the following members:

Constructor	Description
`__init__(self, w, x, y, z)`	Initializes a new instance of the `Quaternion` class.
`__init__(self)`	Constructs a new instance of Quaternion

Property	Description
length	Gets the length of the quaternion
IDENTITY	The Identity quaternion.
w	The w component.
x	The x component.
y	The y component.
z	The z component.

Method	Description
`from_euler_angle(, pitch, yaw, roll)`	Creates quaternion from given Euler angle
`from_euler_angle(, euler_angle)`	Creates quaternion from given Euler angle
`conjugate(self)`	Returns a conjugate quaternion of current quaternion
`inverse(self)`	Returns a inverse quaternion of current quaternion
`dot(self, q)`	Dots product
`euler_angles(self)`	Converts quaternion to rotation represented by Euler angles All components are in radian
`normalize(self)`	Normalize the quaternion
`to_angle_axis(self, angle, axis)`
`concat(self, rhs)`	Concatenate two quaternions
`from_angle_axis(, a, axis)`	Creates a quaternion around given axis and rotate in clockwise
`from_rotation(, orig, dest)`	Creates a quaternion that rotate from original to destination direction
`to_matrix(self)`	Convert the rotation presented by quaternion to transform matrix.
`interpolate(, t, from_address, to)`	Populates this quaternion with the interpolated value between the given quaternion arguments for a t between from and to.
`slerp(, t, v1, v2)`	Perform spherical linear interpolation between two values