Flip UVs options

Use these options to set what happens when you select UV > Flip.

Settings

Direction: Set the direction to flip the UVs of the selected shells: Horizontal or Vertical. The default is Horizontal.
Coordinate: Set Global as required to flip the UV shells in global UV space in the 0 to 1 texture space axis. Select Local to flip the UVs within the bounding box of the selected shells. The default is Local.
Cut UV Perimeter