How to edit triangles

How can i flip the direction of the Triangles within a quad?

delete the edge in quad face and redo the 2 triangles the way you want it

just curious why do you need that ?

happy bl

You can also select the edge and use the command: edge > rotate edge CW or CCW

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For several reasons. One is how light reflects on low poly surfaces. Another is to help with better deformations. Also helpful if you need a concave quad instad of convex.

Not that simple. First you have to triangulate the quad (Strg+T), then rotate edge CW or CCW and finally rejoin the triangles to a quad again (Strg+J). Found an old article on blenderartists about it.

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