examples/penguin/config.json

{ 
    "material": "elastic", 
    "log_E": 4,
    "nu": 0.4,
    "force_coeff": 0.02,
    "drag_mode": "point",
    "drag_point": [0.85, -0.15, 0],
    "drag_dir": [0, 1, 0],
    "prompt": "the penguin is fully lifted upwards and float into the air with a natural motion, as if there is a force applied onto its left wing. No webbed feet, realistic claws and flippers."
}