Function directx_math::XMVector2AngleBetweenNormalsEst

pub fn XMVector2AngleBetweenNormalsEst(N1: FXMVECTOR, N2: FXMVECTOR) -> XMVECTOR

Estimates the radian angle between two normalized 2D vectors.

https://docs.microsoft.com/en-us/windows/win32/api/directxmath/nf-directxmath-XMVector2AngleBetweenNormalsEst