Flip or rotate UV shells

User Guide > Modeling > Mapping UVs > Editing UVs >

The Flip and Rotate features let you easily change the orientation of UV shells within the UV Texture Editor. Flipping a UV shell is useful if you need to correct a UV shell that is reversed or reverse wound (see Display UV winding order).

To flip UVs on a texture shell

Select the faces you want to flip the texture on.
Select Edit UVs > Flip.
In the UV Texture Editor, you can select Polygons > Flip.

or

Select Edit UVs > Rotate.
Choose the direction to flip, and whether to flip within the bounding box of the selection (local) or across the texture space axes (global).
Click Apply.