Scene: scene0257_00 (source dataset: scannet)
Grounding level: object_level — Distance Understanding
Referring expression: Which chair is approximately 0.5 meters away from the wall behind the blackboard?
Ground-truth 3D box: width 0.74 m, length 0.64 m, height 0.81 m; center (2.2, 1.76, 0.29); rotation angle 0