Function vecmath::col_mat4_mul_col

pub fn col_mat4_mul_col<T>(a: Matrix4<T>, b: Matrix4<T>, i: usize) -> Vector4<T> where
    T: Copy + Add<T, Output = T> + Mul<T, Output = T>, 

Computes column vector in column matrix product.

The semantics of the order is the same as for row matrices.