GlbScene accepts an optional lodUrls list and swaps rendered detail by camera
distance to the building's world-space center: lod0 (interactive — identity,
selection, zones, clips all bind here) for normal + building-view distances,
simpler visual-only levels only past ~2.5R / ~8R. Single-URL callers are
unchanged. useGLTFKTX2 now accepts a URL array.
Manual visibility toggling rather than THREE.LOD: THREE.LOD measures distance
to its own origin (0,0,0), which mis-selected levels (blanking the scene) when
the baked geometry is offset from the origin.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
