Function mat4::look_at

pub fn look_at<'a, 'b, T: Copy + Signed + Sqrt>(
    out: &'a mut [T; 16], 
    eye: &'b [T; 3], 
    target: &'b [T; 3], 
    up: &'b [T; 3]
) -> &'a mut [T; 16]