fn from(m: Matrix2<S>) -> Matrix4<S> {
        #[cfg_attr(rustfmt, rustfmt_skip)]
        Matrix4::new(
            m[0][0], m[0][1], S::zero(), S::zero(),
            m[1][0], m[1][1], S::zero(), S::zero(),
            S::zero(), S::zero(), S::one(), S::zero(),
            S::zero(), S::zero(), S::zero(), S::one(),
        )
    }
Clone the elements of a 2-dimensional matrix into the top-left corner
of a 4-dimensional identity matrix.
src/matrix.rs