When invoked without any arguments, the cofr command reports the current center of rotation.
If given an atom-spec, the cofr command sets the center of the bounding box of the given atom(s) as the center of subsequent rotations.
If the view keyword is given instead, the center of rotation is set to be the center of the current view.
~Cofr restores the default center of rotation, which is the center of the bounding box of the currently active models (displayed portions only).