A rock arch about 10 m wide and 6 m high, two masses leaning together over an opening with the dark of the cave closed off a metre and a half behind the plane of the arch. It is deliberately a backdrop and not a room: there is nothing behind it to walk into, so it never opens onto empty background and never hides a scene inside a roof. Overall 13.060 x 6.745 x 6.004 m (X x Y x Z), metre units, +Y up, resting on y=0 with the origin centred on the footprint. Static geometry in a baked pose: no rig, no skinning, no animation, no collision and no navigation data. The library pipeline carries rigid node transforms only, so a posed animal is modelled rather than rigged.