examples/earphone/config.json

{ 
    "material": "elastic", 
    "log_E": 6,
    "nu": 0.45,
    "force_coeff": 0.04,
    "drag_mode": "point",
    "drag_point": [-0.28, 0.21, -0.19],
    "drag_dir": [0, 1, 0],
    "prompt": "the earphone is dragged upwards on its handle and rotates as if there an invisible force"
}