How a mesh's normals are obtained, as ONE value rather than a pair of booleans.
shading used to reach the material as a single flatNormal boolean, which was
adequate for two arms and is not for three: 'none' needs no normal at all, so
as a second boolean it would admit a meaningless flatNormal && noShading
combination and double the variant count for a state that has one behaviour.
Kept as an enum so the invalid combinations do not exist to be tested.
How a mesh's normals are obtained, as ONE value rather than a pair of booleans.
shadingused to reach the material as a singleflatNormalboolean, which was adequate for two arms and is not for three:'none'needs no normal at all, so as a second boolean it would admit a meaninglessflatNormal && noShadingcombination and double the variant count for a state that has one behaviour. Kept as an enum so the invalid combinations do not exist to be tested.