Function vecmath::vec4_normalized_sub
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pub fn vec4_normalized_sub<T>(a: Vector4<T>, b: Vector4<T>) -> Vector4<T> where T: Copy + One + Sqrt + Add<T, Output=T> + Mul<T, Output=T> + Sub<T, Output=T> + Div<T, Output=T>Computes the normalized difference between two vectors.
This is often used to get direction from 'b' to 'a'.