The Red Book seems to make a fairly big deal about keeping the winding consistent in the scene. What about something like a tree though? The polygons making up the leaves will be seen from both sides, so one of them is obviously going to violate the consistent winding rule. If it’s inevitable that polygons are going to be seen from both sides in the scene, is winding really an issue?
Also, I thought that polygons would not appear correctly lit when viewed from both sides because the normal would be wrong for the back side, but the polygons in my scene seem correctly, and identically lit from both sides. So, does it matter if the normal points away from the front or the back, as long as it’s perpendicular to the polygon itself? (All this is assuming flat polygons)
