| { | |
| "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 | |
| } | |
| } | |
| } | |
| } |