I’m trying to learn blender using some of the great tutorials on the net. In one of these tutorials the author asked me to add a plane mesh, delete the face and extrude it to create a wall. But the constructed wall is open at the start. So we add back the face for the first 4 vertices.
Now I asked my self why delete the face prior to the extrusion. I tried and of course it worked. But the extrusion is now in the opposite direction (just typing e and a number). Opposite to the direction of the normal. I tried with a box. I selected a face and extruded it. As expected the new faces extend away from the box in line with the normal. I flipped the normals and now it extrudes into the box. As expected.
So why is a single face behaving differently?
Thanks for your answers.