sort of hack to fix extremely cursed nonsense with the way a polygon's orientation is determined #2011
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so sometimes a polygon is 'normal' and is neither front or back facing
but under specific circumstances a polygon that should have a completely identical dot ends up facing both front and backfacing
this fixes this to work like on hardware maybe i think
this is almost certainly not the correct fix.
but i haven't found any cases that are wrong so it's good enough for me(?)
but i guarantee you there's loads of them and i just haven't found them yet.