1{ 2 "sphere_radius": 0.75, 3 "sphere_density": 1, 4 5 "box_X": 400, 6 "box_Y": 400, 7 "box_Z": 100, 8 9 "time_integrator" : "centered_difference", 10 11 "step_size": 1e-4, 12 "time_end": 1, 13 14 "grav_X": 0, 15 "grav_Y": 0, 16 "grav_Z": -980, 17 18 "normalStiffS2S": 1e8, 19 "normalStiffS2W": 1e8, 20 21 "normalDampS2S": 1e2, 22 "normalDampS2W": 1e2, 23 24 "tangentStiffS2S": 1e8, 25 "tangentStiffS2W": 1e8, 26 27 "tangentDampS2S": 1e2, 28 "tangentDampS2W": 1e2, 29 30 "friction_mode" : "multi_step", 31 "static_friction_coeffS2S": 0.5, 32 "static_friction_coeffS2W": 0.5, 33 34 "rolling_mode" : "schwartz", 35 "rolling_friction_coeffS2S" : 0.5, 36 "rolling_friction_coeffS2W" : 0.5, 37 38 "cohesion_ratio": 5, 39 "adhesion_ratio_s2w": 0, 40 41 "verbose": 0, 42 43 "psi_T": 32, 44 "psi_L": 16, 45 "output_dir": "terrain", 46 "write_mode": "csv" 47} 48