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Mirror clipping determines how edit operations handle vertices moving across the positive/negative boundary at X=0 while in [link=mirror_mode]Mirror Mode[/link]. When mirror clipping is active, a vertex's X component is prevented from changing signs; if it started negative, movement toward the positive side will be halted at X=0, and if it started positive, movement toward the negative side will be halted at X=0. If a vertex's position was exactly at X=0, it cannot be moved in either direction on the X axis with mirror clipping enabled.

When mirror clipping is disabled, vertices can freely cross the X axis boundary, and be moved away from it in either direction if they started at X=0. Beware that this can result in geometry intersecting its mirror image, which generally is not desirable; the recommended workflow while in mirror mode is to leave mirror clipping active by default, and disable it briefly only when a vertex needs to be moved away from the center line.

Mirror clipping has no effect on meshes that are not in mirror mode.