Chris H, here is a cube with the checker pattern used as a normal. It
looks to me like the black areas are down, the white areas are up. I
thought that this would be a teaching moment for me but I think I'm
sticking to my guns. Have I really misunderstood this?
Obviously, I know there's no change to the real "surface," but it looks
to me like the normal algorithm is making white things up black things
down.
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