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Creates a camera (or object) mirrored in a user defined plane. So it is effectively a mirror constraint. The created object has a live connection to the original object. Good solution to the problem of rendering render elements (motion vector and DOF etc) in a ray-trace reflection. Bear in mind you need to laterally invert (flop) the resultant image when compositing.
How to use :
1) Execute the script from script editor or add as a shelf button.
2) Select a camera and add to the "Currently selected camera" in the "Camera Section".
3) Select the plane you intend to reflect through, and add it to the "Currently selected reflection plane" in the "Reflection Plane Section".
4) Select a face on the reflection plane and add it to the vertex list section.
5) Check the instance checkbox to preserve shape data. (Not recommended for cameras, can lead to problems when rendering.)