For convenient manipulation of many checkboxes, it is possible to change a range of boxes at once by holding down the Shift key, similar to the use of the Shift key to select multiple files in a browser. Specifically, first toggle a button at one end of the desired range. Then press Shift and toggle the button at the other end of the range. As long as the two buttons have the same ending state, and no other intervening action was taken, all of the buttons in the range will be set to that state. This feature is available for both the object On/Off buttons and the group membership buttons to the left of them. When toggling On/Off buttons, the whole change can be undone with a single Ctrl-Z.

The top row of the Object Group Selection section contains a spin box for selecting the current group, an indicator of the number of groups defined (initially /0 when there are no groups), and an edit box for entering a name for the group. The second row has buttons for operating on the groups themselves, and the third row has buttons for operating on objects.

Initially, the spin box will show None and all buttons will be disabled except New. When you create a new group with New or select an existing group, the rest of the buttons will become available. In addition, a second checkbox will appear for each object, to the left of the On/Off checkbox, to indicate whether the object is a member of the group.

• Use the New button to add a new object group. If there is a current group defined, the new group will initially be a copy of that group.
• The Delete button will remove the current group from the list of groups.
• The Clear button will remove all objects from the current group.
• The Add All button will add all objects to the current group.
• The Swap button will exchange group members and non-members; current members will be dropped from the group and the rest of the objects will be added to it.
• The ON button will turn on all members of the current group without affecting any other objects.
• The OFF button will turn off all members of the current group without affecting any other objects.
• The Others On button will turn on all objects except members of the current group. Thus, to see just objects not in a group, push OFF and Others On.
• The Others Off button will turn off all objects except members of the current group. Thus, to see just the objects in a group, push ON and Others Off.

The object groups defined here will be saved as part of the model, but the number of the current group is not saved between sessions of 3dmod. When the program is started as 3dmod rather than 3dmodv, changes in groups can be undone just like other model changes.

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