Main toolbar > Mirror > Mirror dialog
Tools menu > Mirror > Mirror dialog
The Mirror dialog enables you to move one or more objects while mirroring their orientation. It also lets you mirror the current selection about the center of the current coordinate system. You can create a clone with the mirror dialog at the same time. If you mirror a hierarchical linkage you have the option to mirror the IK limits.
The Mirror dialog uses the current reference coordinate system, as reflected in its name. For example, if Reference Coordinate System is set to Local, the dialog is named Mirror: Local Coordinates. There is one exception: If Reference Coordinate System is set to View, Mirror uses Screen coordinates.
As you adjust the various settings in the Mirror dialog, you see the results in the viewports.
For more information on using Mirror, see Mirroring Objects.
Procedures
To mirror an object:
Make any object selection.
Click Mirror on the Main toolbar, or choose Tools > Mirror from the menu bar.
This brings up the Mirror Selection dialog.
Set the mirror parameters in the dialog.
The active viewport changes to show the effect of each parameter as you set it. When you click OK, the software creates the choice of mirror that you see previewed.
To make a clone using mirror:
Make any object selection
Click Mirror on the Main toolbar, or choose Tools > Mirror from the menu bar.
This brings up the Mirror Selection dialog.
In Clone Selection, turn on the appropriate choice of copy, instance or reference.
Interface
Mirror Axis group
Option buttons on the Constraints toolbar labeled X, Y, Z, XY, XZ, YZ specify the direction of the mirroring.
Offset: Specifies the distance of the mirrored object's pivot point from the original object's pivot point.
Clone Selection group
Determines the type of copy made by the Mirror function. Default is No Clone.
No Clone: Mirrors the selected object to the new position without making a copy.
Copy: Mirrors a copy of the selected object to the specified position.
Instance: Mirrors an instance of the selected object to the specified position.
Reference: Mirrors a reference of the selected object to the specified position.
If you have Animation turned on, mirroring generates a Scale key.
Mirror IK Limits: Causes the IK constraints to be mirrored (along with the geometry) when you mirror the geometry about a single axis. Clear this if you don't want the IK constraints to be affected by the mirror command. Default is On.
Mirror Bones: Turn on when you are mirroring a Bones system or objects being used as bones. If this toggle is off when you mirror bones, the subsequent results of an IK solution might be unpredictable.