bFlippedFaces

Whether the MeshDescription polygon faces have been reversed with respect to how they were immediately after import. We use this during the merge process, as nodes may share the same mesh and have oddnegative and non-oddnegative scales. To compensate for how the vertices are baked with the node transforms during merge, we need to flip polygon facing. But since the nodes are merged in random order, this helps us coordinate whether we need to reverse or not the polygon facing once more.