Flip an object across one or more axes.
Flipping an object involves scaling it by a factor of -1. Mathematically, the negative factor flips the points of the object across the axis, and a factor of 1 preserves the current size of the object.
For example, to flip across the X axis, type -1 1 1. To flip across the Y and Z axes, type 1 -1 -1.
Create a flipped duplicate of the picked objects
For example, to flip across the X axis, type -1 1 1. To flip across the Y and Z axes, type 1 -1 -1.