File size: 3,597 Bytes
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"description": "The task involves a trirectangular tetrahedron which forms a initially tight fit with its complementary base fixed on the table. Then, the trirectangular tetrahedron is released and falls under its own gravity.",
"prompt": "Static frontal camera view: A solid wooden trirectangular tetrahedron (mass ≈ 84 g) is tightly wedged against its stationary matching base (mass ≈ 997 g) atop a black perforated optical table. The two components combine to form a single upright rectangular block divided by a diagonal contact seam. Coefficient of friction for wood-on-wood contact ≈ 0.39; coefficient of restitution ≈ 0.37. An out-of-frame tension string securing the tetrahedron is released, after which frictional forces alone are insufficient to retain the tetrahedron on the base’s inclined surface. The tetrahedron follows a sequence of rigid-body motion governed by gravity: sliding along the slope, detaching fully from the base, free falling through air, potentially bouncing or tumbling upon impact, and finally settling into a stable resting configuration. The complementary base remains entirely stationary for the full duration of the motion event.",
"assets": {
"teh": {
"model": "../../assets/obj/teh.obj",
"material": {
"wood": {
"mass": 0.0839,
"density": 503.4,
"friction": 0.388428,
"restitution": 0.370309
},
"plastic": {
"mass": 0.0529,
"density": 317.4,
"friction": 0.182460,
"restitution": 0.307058
}
}
},
"base": {
"model": "../../assets/obj/tehC.obj",
"material": {
"wood": {
"mass": 0.9969,
"density": 543.7636,
"friction": 0.388428,
"restitution": 0.370309
},
"plastic": {
"mass": 0.4104,
"density": 223.8545,
"friction": 0.182460,
"restitution": 0.307058
}
}
}
},
"tasks": {
"default": {
"assets": ["teh", "base"],
"translation": {
"teh": {
"wood": [0.504278, 0.408961, 0.180622],
"plastic": [0.505473, 0.406877, 0.180174]
},
"base": {
"wood": [0.468923, 0.408961, 0.105622],
"plastic": [0.470118, 0.406877, 0.105174]
},
"ground": {
"wood":[0, 0, 0.005622],
"plastic": [0, 0, 0.005174]
}
},
"orientation": {
"teh": {
"wood": [0, 0, 0],
"plastic": [0, 0, 0]
},
"base": {
"wood": [0, 0, 0],
"plastic": [0, 0, 0]
}
},
"fixed": {
"teh": false,
"base": true
},
"kinematic": {
"teh": false,
"base": false
},
"record": {
"assets": ["teh"],
"dim": ["x", "y", "z"],
"fps": 30
}
}
}
} |