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See also: Creating Surface Groups
Note that you cannot join or extend surface groups, but you can add or remove surfaces from existing surface groups by using this command. A surface group can be exploded into its constituent surfaces.
Side Selection - Selects the surface sides when editing a surface group. Choose between the following methods:
Prompt - You will be prompted to select each surface.
Up - You are only prompted for the side of vertical or wrap-over surfaces. In almost all other cases, up is correctly determined automatically.
Forward - The default forward side is chosen for all surfaces without prompting. This method is useful if the surface sides are known to be correct.
Swap - Selects the opposite of the current setting. This is useful if most surface groups are correct as you are only required to select those surfaces which are incorrect and swap them to the correct side.