I'm following this really good tutorial, about Texture Painting, from CG Boost (https://www.youtube.com/watch?v=lmbAs9jE1vI). At some point the the paint doesn't work because of flipped faces I realised that the paint doesnt work on some faces. On a comment of this video on youtube, someone stated that recalculate the normals. If you did so the paint actually worked. But it brought a question:
I see that the red faces shows that the mesh is turned inside out, but this blue line show that the normals are facing out. Whats is the diference between face orientation an normals, and how can I make then to point to the same side ?