pub fn XMVector3AngleBetweenNormals(N1: FXMVECTOR, N2: FXMVECTOR) -> FXMVECTOR
Computes the radian angle between two normalized 3D vectors.
N1 Normalized 3D vector.
N1
N2 Normalized 3D vector.
N2
Returns a vector. The radian angle between N1 and N2 is replicated to each of the components.
https://docs.microsoft.com/en-us/windows/win32/api/directxmath/nf-directxmath-XMVector3AngleBetweenNormals