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Kent1Cooper
en respuesta a: qazzapatol

Help for [ordinary] MIRROR says it pretty clearly:

 

The two specified points become the endpoints of a line about which the selected objects are mirrored. For mirroring in 3D, this line defines a mirroring plane perpendicular to the XY plane of the user coordinate system (UCS) containing the mirror line.

 

That's why the second point must lie in the XY plane of the first one, meaning the equivalent of OSNAPZ being turned on.  And it's why you need to use MIRROR3D if you need otherwise.

Kent Cooper, AIA