Mirroring a Set of Entities (3D Environment)

After starting the Mirror Entities command, proceed as follows:

1	Select the entities you want to apply the transformation to using a window selection. End selection by right-clicking and choosing Continue in the context menu. To change the selected entities, right-click on Entities, select Reset in the context menu and perform selection again.
2	In the Symmetry plane drop-down list, choose the definition mode for the symmetry plane: 3 Points To define the symmetry plane by specifying three points lying on it. Once the mode is selected, specify the points (to change the selected ones, right-click on 3 Points and select Reset in the context menu). Plane To define the symmetry plane as an existing plane or face of solid. Once the mode is selected, select the plane (to change the selected one, right-click on Plane and select Reset in the context menu). Perpendicular to axis & point To define the symmetry plane as the one perpendicular to a selected axis and through a specified point. Once the mode is selected, set the Axis mode and specify the point (to change the selected ones, right-click on Axis and/or Point and select Reset in the context menu). For example, choose 3 Points and select three points as in the following illustration.
3	To make one copy of the selected entities, select Copy. The preview shows what you will obtain: To undo the transformation you can check in the preview, before actually applying it and quitting the command, click the button.
4	Under More Options you can find three additional options: Mirror texts If selected, the whole text strings and each character will be mirrored. If not selected, only strings will be mirrored. Mirror texts selected Mirror texts not selected Linked copies If selected, copies of objects with a history (such as solids, parametric entities, and reference dimensions) remain related to their source entities and are therefore subject to any changes made to the dimensions or variables of the original entities. If not selected, the copies become constant. For example, the transformation of a sweep solid loses its sweep dimensions. Keep Attributes If selected, copies of objects retain the attributes (such as color, line type, and layer) of the original. If not selected, copies assume the corresponding current property values.
5	Click or to confirm your selections and apply the transformation. Click to discard your changes.