Usage:
focus [ atom-spec ]

Usage:
~focus

Focus adjusts the view and center of rotation based on displayed atoms, bonds, ribbon segments, and/or surfaces. Items that are invisible only because they fall outside the window boundaries or are clipped are still considered displayed. Any combination of atoms and surface pieces can be specified, but only those which are also displayed will be considered.

Focus with an atom-spec:

1. turns on global clipping and adjusts the clipping plane positions and scale to include the specified items that are also displayed
2. sets the center of rotation method to the center of view (like cofr view)

1. turns off global clipping and adjusts the view to include all displayed items (like window sans arguments)
2. sets the center of rotation method to front center (like ~cofr)

The center of rotation can also be controlled with the Rotation tool.

See also: center, cofr, window, the Actions menu