Mirroring Objects
The Mirror tool can mirror 2D and 3D objects. However, if both 2D and 3D objects are selected, only the 2D objects are mirrored. Depending on which types of objects are selected, there are four modes.
Mirrors the selected object about an axis line. For 3D objects, the mirrored object is on the same plane as the original object (parallel to the working plane) unless Mirror in Screen Plane is selected.
Creates a duplicate of the selected object and then mirrors the duplicate about an axis line. For 3D objects, the mirrored object is on the same plane as the original object (parallel to the working plane) unless Mirror in Screen Plane is selected.
Mirror in Screen Plane cannot be used with wall objects. Also, this option has no effect when Mirror Across Working Plane is used, or when the drawing is in a view parallel to the screen plane, such as Top or Front.

Common Functions and Utilities : Mirroring Objects

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