{
  "task_id": "ale_4d_mpm_finite_pulse_collision_001",
  "description": "Reconstruct a finite water-sand pulse collision in a stationary glass enclosure.",
  "coordinate_system": "world-space metres, Z up",
  "resolution": [
    640,
    400
  ],
  "fps": 32,
  "frames": 49,
  "sample_times": "frame / 32 seconds, frames 0 through 48 inclusive",
  "materials": [
    "granular continuum",
    "Newtonian liquid, inviscid approximation"
  ],
  "matter_family": "flowing",
  "moving_bodies": "several: two material bodies",
  "dynamics": "passive after initialization; finite initial pulses; no subsequent emission",
  "large_deformation": true,
  "ground_surface_z_m": 0.075,
  "enclosure_inner_bounds_xy_m": [
    [
      0.04,
      1.96
    ],
    [
      0.04,
      1.16
    ]
  ],
  "pipe_outlet_centres_m": [
    [
      0.36,
      0.6,
      0.78
    ],
    [
      1.64,
      0.6,
      0.78
    ]
  ],
  "pipe_outlet_inner_radius_m": 0.057,
  "camera": "camera.json (fixed calibrated pinhole camera)",
  "public_metadata_policy": "No generating seed, detailed initial particle coordinates, material constants or reference trajectories are supplied to the agent."
}