'flip' [<set> <e>|<b>|<s>]|
          [<s> ['auto']]
This command changes the orientation of a set of shell-elements, bodies or surfaces. In case of a single surface with the parameter “auto” all surfaces will be flipped in a way that they share a common direction (in or out of a volume). The related elements are also flipped. See qflp for the cursor controlled command.