Function directx_math::XMQuaternionSquad

pub fn XMQuaternionSquad(
    Q0: FXMVECTOR, 
    Q1: FXMVECTOR, 
    Q2: FXMVECTOR, 
    Q3: GXMVECTOR, 
    t: f32
) -> FXMVECTOR

Interpolates between four unit quaternions, using spherical quadrangle interpolation.

Parameters

Q0 First unit quaternion.

Q1 Second unit quaternion.

Q2 Third unit quaternion.

Q3 Fourth unit quaternion.

t Interpolation control factor.

Return value

Returns the interpolated quaternion. If Q0, Q1, Q2, and Q3 are not all unit quaternions, the returned quaternion is undefined.

Remarks

The DirectXMath quaternion functions use an XMVECTOR 4-vector to represent quaternions, where the X, Y, and Z components are the vector part and the W component is the scalar part.

The use of this method requires some setup before its use. See XMQuaternionSquadSetup for details.

This method uses the following sequence of spherical linear interpolation operations.

Slerp(Slerp(q1, c, t), Slerp(a, b, t), 2t(1 - t))

Reference

https://docs.microsoft.com/en-us/windows/win32/api/directxmath/nf-directxmath-XMQuaternionSquad

https://docs.microsoft.com/en-us/previous-versions/windows/desktop/bb281656(v=vs.85)