Object Edit > Align > Symmetry Plane Align

Aligns an object with its mirrored half across the symmetry plane.

Procedures

Align curves or surfaces across the symmetry plane

Symmetry Plane Align Options

Project For Position

When this option is checked on (default), the tool modifies the object to be position continuous with its mirror hlaf across the symmetry plane, as well as tangent continuous.

When checked off, if the object does not touch its mirror half across the symmetry plane, the tool modifies only the object’s tangent, but does not attempt to make it touch the plane.