DIAGNOSTIC — native OrbitControls only. No app code: no hotspots, panels, tweens, fences or custom handlers.
One finger: rotate · Pinch: zoom · Two-finger drag: pan. loading…
Landmarks (target Y when centered): head ≈ 3.64 · pelvis ≈ 2.23 · knee ≈ 1.0 · feet ≈ 0.1