# m_mirror Generate a 4x4 transformation matrix which can pass into `multmatrix` to mirror the child element on a plane through the origin. **Since:** 1.1 ## Parameters - `v` : The normal vector of a plane intersecting the origin through which to mirror the object. ## Examples use ; rotate([0, 0, 10]) cube([3, 2, 1]); multmatrix(m_mirror([1, 1, 0])) rotate([0, 0, 10]) cube([3, 2, 1]); ![m_mirror](images/lib3x-m_mirror-1.JPG)