excludeFromWindingParity property
When true, this node's own transform is treated as a coordinate-system
convention rather than a geometry mirror, and excluded from
windingFlipped. The importers set this on the synthesized scene root
that flips glTF's handedness (scale(1, 1, -1)), so that flip does not
reverse cull winding the way a real mirror node should.
Implementation
bool excludeFromWindingParity = false;