Say you create a perfect box. You then extured one side to double its length. All the polys that are extruded from the side poly have flipped normals. Also the originaly poly I extruded from still exists, so when I flip my normals there is a poly in the center which is invisable unless you are on the inside of the box. Is there a way to avoid this besides manually flipping each normal and deleting that center poly?
