You can switch the edge dividing two triangle polygons so it connects the opposite corners. This can often make a significant difference in the shape of low-polygon count models or improve the visual flow of a polygon mesh.
For example, the placement or orientation of an edge on a polygonal face could determine the profile and placement of the bridge of a nose or the placement of the cheeks on a character model.
To flip edges
- Select one or more edges to flip.
The edge should be a shared edge between two triangles.
- Select Edit Mesh > Flip Triangle Edge.
Troubleshooting Flip Triangle Edge
I cannot flip an edge?
- You cannot flip edges that are texture borders in UV space.
- You cannot flip border edges, including hole borders.
- You cannot flip edges with zero length.