Sets a specific center of rotation in 3D Orbit view.
Summary
Starts 3D Orbit view and uses a center of rotation that you specify, either with your pointing device or by entering coordinates. If you specify a point outside the current view, 3DORBITCTR ignores the specified point and uses the default center of rotation.
3DORBITCTR overrides the Orbit Auto Target option, available from the shortcut menu when the 3DORBIT command is active.