The title says everything.
I'm currently using the Texture Paint Mode of Blender3D to create the texture of an interior scene, with flat faces.
I use Shift+7 in Edit Mode to be at the very front of the face, in order to paint easier.
But sometimes, this view is rotated so it displays the face as if I were upside down, like a fly on the ceiling.
By using the "Normal" transform orientation, I understood that it is because some normals are "rolled" (like in rool-yaw-pitch).
I tried to find a hotkey to roll the normal, in vain.
I tried to make faces by selecting vertices in different orders, no way.
I succeed in having the good normal in a cube by cloning an existing face and put instead of the one with the bad normal.
But it can't work in a complexe scene where all the faces are different.
The following image shows the default cube (1), and the final cube (2).
there is no roll for normals, you can only flip the direction (inside/outside). Maybe a bug? You should submit a bug report
I'm sitting, waiting, wishing, building Blender in superstition...