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A local two-level glTF fixture uses NEEDLE_progressive metadata and the installed Needle manager to swap indexed geometry on demand.

This route verifies explicit mesh-LOD registration and swapping with local fixtures. The official Mobile Home, airship, Forgotten Knight, HDRI, remote progressive responses, texture LODs, exact screen-density policy, and whole-example fidelity remain separate.

Sources: official example · Needle glTF progressive