{
  "model": 5,
  "terrain": {
    "gridStep": 0.0025,
    "goalCurvatureRadius": 3,
    "goalDwell": 3,
    "maxAuthoredSlopeDegrees": 15,
    "baseFeatures": [
      {
        "id": "hill",
        "label": "RISE",
        "x": 0.145,
        "y": 0.127,
        "rx": 0.045,
        "ry": 0.026,
        "height": 0.002
      },
      {
        "id": "dip",
        "label": "DIP",
        "x": 0.147,
        "y": 0.213,
        "rx": 0.047,
        "ry": 0.04,
        "height": -0.0036
      },
      {
        "id": "lip",
        "label": "LIP",
        "x": 0.209,
        "y": 0.424,
        "rx": 0.025,
        "ry": 0.025,
        "height": 0.0021
      },
      {
        "id": "goal",
        "label": "HOLD 3s",
        "x": 0.26,
        "y": 0.585,
        "rx": 0.03,
        "ry": 0.03,
        "height": 0.000049999999999999996
      }
    ],
    "obstacleHeightScaling": "linear in board scale",
    "goalHeightScaling": "quadratic in board scale"
  },
  "units": "SI",
  "evidence": "Provisional scenario parameters. Billiard/baize muKinetic=.20 and rolling deceleration/g=.01 are pooltool reference defaults; billiard/rubber e=.98 and impact friction=.14 are borrowed from Mathavan et al., not fitted to this geometry. All other contact numbers are assumptions.",
  "air": {
    "density": 1.225,
    "dragCoefficient": 0.47
  },
  "balls": {
    "steel": {
      "name": "Steel",
      "short": "STEEL",
      "description": "Solid steel · long coast, firm rebounds",
      "density": 7900,
      "radius": 0.0075,
      "inertiaRatio": 0.4
    },
    "rubber": {
      "name": "Bouncy rubber",
      "short": "RUBBER",
      "description": "Solid rubber · grippy, lively rebounds",
      "density": 1100,
      "radius": 0.0075,
      "inertiaRatio": 0.4
    },
    "pingpong": {
      "name": "Table tennis",
      "short": "TABLE TENNIS",
      "description": "Hollow shell · light, springy, air resistance matters most",
      "mass": 0.0027,
      "radius": 0.02,
      "inertiaRatio": 0.6666666666666666
    },
    "cork": {
      "name": "Cork",
      "short": "CORK",
      "description": "Solid cork · soft contacts and short coast",
      "density": 240,
      "radius": 0.0075,
      "inertiaRatio": 0.4
    },
    "billiard": {
      "name": "Billiard",
      "short": "BILLIARD",
      "description": "Solid resin · substantial momentum, precise rolling",
      "mass": 0.17,
      "radius": 0.028575,
      "inertiaRatio": 0.4
    }
  },
  "floors": {
    "wood": {
      "name": "Hardwood",
      "description": "Sealed wood. Counter-tilt to brake.",
      "scene": "THE WORKSHOP"
    },
    "sand": {
      "name": "Dry sand",
      "description": "A shallow granular bed. A larger tilt may be needed to start.",
      "scene": "THE DUNES",
      "density": 1600,
      "depth": 0.005,
      "sinkFactor": 0.46,
      "ploughFactor": 0.18,
      "rollingFactor": 0.12,
      "inertialFactor": 1.5
    },
    "ice": {
      "name": "Smooth ice",
      "description": "Low grip. Strong tilts and reversals can make the ball skid.",
      "scene": "THE ICE RINK"
    },
    "baize": {
      "name": "Baize",
      "description": "Woven cloth. Rolling resistance helps the ball settle.",
      "scene": "THE BILLIARD ROOM"
    }
  },
  "walls": {
    "wood": {
      "name": "Hardwood",
      "description": "Rigid wooden walls; rebound depends on the ball."
    },
    "rubber": {
      "name": "Rubber bumpers",
      "description": "Passive elastic bumpers; they return energy but never add it."
    }
  },
  "floorContacts": {
    "steel": {
      "wood": {
        "muStatic": 0.25,
        "muKinetic": 0.18,
        "muImpact": 0.2,
        "eRef": 0.55,
        "eTangent": 0,
        "b0": 0.000008,
        "b1": 0.000012,
        "effectiveModulus": 1000000000
      },
      "sand": {
        "muStatic": 0.55,
        "muKinetic": 0.4,
        "muImpact": 0.4,
        "eRef": 0.05,
        "eTangent": 0,
        "b0": 0.000008,
        "b1": 0.000012,
        "effectiveModulus": 1000000000
      },
      "ice": {
        "muStatic": 0.03,
        "muKinetic": 0.025,
        "muImpact": 0.025,
        "eRef": 0.55,
        "eTangent": 0,
        "b0": 0,
        "b1": 0,
        "effectiveModulus": 1000000000
      },
      "baize": {
        "muStatic": 0.25,
        "muKinetic": 0.2,
        "muImpact": 0.2,
        "eRef": 0.35,
        "eTangent": 0,
        "b0": 0.000126,
        "b1": 0,
        "effectiveModulus": 10000000
      }
    },
    "rubber": {
      "wood": {
        "muStatic": 0.85,
        "muKinetic": 0.65,
        "muImpact": 0.7,
        "eRef": 0.85,
        "eTangent": 0.45,
        "b0": 0.00004,
        "b1": 0.00005,
        "effectiveModulus": 5000000
      },
      "sand": {
        "muStatic": 0.8,
        "muKinetic": 0.6,
        "muImpact": 0.6,
        "eRef": 0.12,
        "eTangent": 0,
        "b0": 0.00004,
        "b1": 0.00005,
        "effectiveModulus": 5000000
      },
      "ice": {
        "muStatic": 0.1,
        "muKinetic": 0.07,
        "muImpact": 0.08,
        "eRef": 0.78,
        "eTangent": 0.25,
        "b0": 0.000008,
        "b1": 0.00001,
        "effectiveModulus": 5000000
      },
      "baize": {
        "muStatic": 0.85,
        "muKinetic": 0.65,
        "muImpact": 0.65,
        "eRef": 0.65,
        "eTangent": 0.2,
        "b0": 0.0002625,
        "b1": 0.00002,
        "effectiveModulus": 3000000
      }
    },
    "pingpong": {
      "wood": {
        "muStatic": 0.25,
        "muKinetic": 0.2,
        "muImpact": 0.2,
        "eRef": 0.85,
        "eTangent": 0.1,
        "b0": 0.00003,
        "b1": 0.00002,
        "effectiveModulus": 10000000
      },
      "sand": {
        "muStatic": 0.45,
        "muKinetic": 0.3,
        "muImpact": 0.3,
        "eRef": 0.12,
        "eTangent": 0,
        "b0": 0.00003,
        "b1": 0.00002,
        "effectiveModulus": 10000000
      },
      "ice": {
        "muStatic": 0.04,
        "muKinetic": 0.03,
        "muImpact": 0.03,
        "eRef": 0.82,
        "eTangent": 0.05,
        "b0": 0,
        "b1": 0,
        "effectiveModulus": 10000000
      },
      "baize": {
        "muStatic": 0.3,
        "muKinetic": 0.2,
        "muImpact": 0.2,
        "eRef": 0.65,
        "eTangent": 0.1,
        "b0": 0.0005,
        "b1": 0,
        "effectiveModulus": 5000000
      }
    },
    "cork": {
      "wood": {
        "muStatic": 0.6,
        "muKinetic": 0.45,
        "muImpact": 0.45,
        "eRef": 0.28,
        "eTangent": 0,
        "b0": 0.00012,
        "b1": 0.0001,
        "effectiveModulus": 2000000
      },
      "sand": {
        "muStatic": 0.6,
        "muKinetic": 0.45,
        "muImpact": 0.45,
        "eRef": 0.05,
        "eTangent": 0,
        "b0": 0.00012,
        "b1": 0.0001,
        "effectiveModulus": 2000000
      },
      "ice": {
        "muStatic": 0.08,
        "muKinetic": 0.06,
        "muImpact": 0.06,
        "eRef": 0.25,
        "eTangent": 0,
        "b0": 0.00003,
        "b1": 0.00003,
        "effectiveModulus": 2000000
      },
      "baize": {
        "muStatic": 0.65,
        "muKinetic": 0.45,
        "muImpact": 0.45,
        "eRef": 0.2,
        "eTangent": 0,
        "b0": 0.00031499999999999996,
        "b1": 0.00005,
        "effectiveModulus": 1000000
      }
    },
    "billiard": {
      "wood": {
        "muStatic": 0.25,
        "muKinetic": 0.2,
        "muImpact": 0.2,
        "eRef": 0.6,
        "eTangent": 0,
        "b0": 0.00003,
        "b1": 0.00002,
        "effectiveModulus": 1000000000
      },
      "sand": {
        "muStatic": 0.55,
        "muKinetic": 0.4,
        "muImpact": 0.4,
        "eRef": 0.05,
        "eTangent": 0,
        "b0": 0.00003,
        "b1": 0.00002,
        "effectiveModulus": 1000000000
      },
      "ice": {
        "muStatic": 0.04,
        "muKinetic": 0.03,
        "muImpact": 0.03,
        "eRef": 0.65,
        "eTangent": 0,
        "b0": 0,
        "b1": 0,
        "effectiveModulus": 1000000000
      },
      "baize": {
        "muStatic": 0.25,
        "muKinetic": 0.2,
        "muImpact": 0.2,
        "eRef": 0.4,
        "eTangent": 0,
        "b0": 0.00040005,
        "b1": 0,
        "effectiveModulus": 10000000
      }
    }
  },
  "wallContacts": {
    "steel": {
      "wood": {
        "muStatic": 0.25,
        "muKinetic": 0.18,
        "muImpact": 0.2,
        "eRef": 0.55,
        "eTangent": 0,
        "b0": 0.000008,
        "b1": 0.000012,
        "effectiveModulus": 1000000000
      },
      "rubber": {
        "muStatic": 0.7,
        "muKinetic": 0.55,
        "muImpact": 0.55,
        "eRef": 0.88,
        "eTangent": 0.15,
        "b0": 0.000008,
        "b1": 0.000012,
        "effectiveModulus": 3000000
      }
    },
    "rubber": {
      "wood": {
        "muStatic": 0.85,
        "muKinetic": 0.65,
        "muImpact": 0.7,
        "eRef": 0.85,
        "eTangent": 0.45,
        "b0": 0.00004,
        "b1": 0.00005,
        "effectiveModulus": 5000000
      },
      "rubber": {
        "muStatic": 0.9,
        "muKinetic": 0.75,
        "muImpact": 0.75,
        "eRef": 0.88,
        "eTangent": 0.4,
        "b0": 0.00004,
        "b1": 0.00005,
        "effectiveModulus": 3000000
      }
    },
    "pingpong": {
      "wood": {
        "muStatic": 0.25,
        "muKinetic": 0.2,
        "muImpact": 0.2,
        "eRef": 0.85,
        "eTangent": 0.1,
        "b0": 0.00003,
        "b1": 0.00002,
        "effectiveModulus": 10000000
      },
      "rubber": {
        "muStatic": 0.6,
        "muKinetic": 0.45,
        "muImpact": 0.45,
        "eRef": 0.9,
        "eTangent": 0.2,
        "b0": 0.00003,
        "b1": 0.00002,
        "effectiveModulus": 3000000
      }
    },
    "cork": {
      "wood": {
        "muStatic": 0.6,
        "muKinetic": 0.45,
        "muImpact": 0.45,
        "eRef": 0.28,
        "eTangent": 0,
        "b0": 0.00012,
        "b1": 0.0001,
        "effectiveModulus": 2000000
      },
      "rubber": {
        "muStatic": 0.7,
        "muKinetic": 0.5,
        "muImpact": 0.5,
        "eRef": 0.35,
        "eTangent": 0,
        "b0": 0.00012,
        "b1": 0.0001,
        "effectiveModulus": 3000000
      }
    },
    "billiard": {
      "wood": {
        "muStatic": 0.25,
        "muKinetic": 0.2,
        "muImpact": 0.2,
        "eRef": 0.6,
        "eTangent": 0,
        "b0": 0.00003,
        "b1": 0.00002,
        "effectiveModulus": 1000000000
      },
      "rubber": {
        "muStatic": 0.14,
        "muKinetic": 0.14,
        "muImpact": 0.14,
        "eRef": 0.98,
        "eTangent": 0,
        "b0": 0.00003,
        "b1": 0.00002,
        "effectiveModulus": 3000000,
        "constantRestitution": true
      }
    }
  }
}