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There are two major changes here: 1) Previously I was inverting the winding of verticies only when calculating the normal. This was the wrong approach and I instead needed to invert the order of the verticies before calculating the normal. This is because most STL processing software (eg: Slic3r) will recalculate the normals based off the winding (correctly). 2) I *think* I am doing proper BFC handling now, although TBH the BFC handling logic in ldraw is super complex to me. See: https://www.ldraw.org/article/415 ("Rendering Engine Guidelines").