Mirror
The XForm>Mirror functions can be used to reflect selected geometry across a plane. To access the Mirror>Move, Copy, and Join functions, select Mirror from the XForm Menu.
Using the Function:
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Select Mirror from the Transform Menu.
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Select Move, Copy, or Join (see icons below) from the Transform>Mirror submenu.
Mirror>Move
Mirror>Copy
Mirror>Join
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Select the entities you intend to mirror.
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Define the mirroring plane by using one of the following options: