
The Morph deformer lets you quickly mirror geometry.
In this example, a Morph Deformer Mirror effect is applied to a face model and the expression is mirrored from one side of the caharcter face to the other along the X axis.

A Morph Deformer mirrors a facial expression.
 . The 
		  Morph options window appears. (The Deform menu appears in the Modeling (F2), Rigging (F3) or Animation (F4) menu sets.)
. The 
		  Morph options window appears. (The Deform menu appears in the Modeling (F2), Rigging (F3) or Animation (F4) menu sets.) 
		
The right side of the face is changed from +x to -y axis