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### Miror

A miror is a plane and a thickness. If the distance from a vertex to the miror plane is less than the miror thickness, the vertex won't be mirored in the miror operation. For all other vertices, a symetric vertex is added in order to build the mirored object. An example is given in the following pictures.

This tool opens the following selection tool.

| : Select a vertex. The miror plane is defined by three vertices of the object. Each time the user click on a vertex, the latest selected vertex is unselected and the new one is selected. The three selected vertices are marqued with a green box. The vertices inside the miror plane (with its current thickness) are marqued with a red box. : Miror thickness. Changes the miror thickness. Press "Enter" to enter a value, or drag the mouse. The horizontal position of the mouse will change the miror thickness. The thickness itself is displayed in the information area. The vertices becomes red as the thickness change.

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