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dotSCAD/docs/lib2-m_mirror.md
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# 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
include <matrix/m_mirror.scad>;
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/lib-m_mirror-1.JPG)