const MODEL = {
 "units": "mm",
 "parts": [
  {
   "id": "wall",
   "name": "벽체",
   "kind": "wall",
   "type": "ring",
   "color": "#8a9bb0",
   "alpha": 0.25,
   "cx": 0,
   "cy": 0,
   "z0": -70200,
   "z1": -2000,
   "r_out": 5500,
   "r_in": 4850
  },
  {
   "id": "topslab",
   "name": "상부 슬래브",
   "kind": "topslab",
   "type": "disc",
   "color": "#c8c8c8",
   "cx": 0,
   "cy": 0,
   "z0": -2000,
   "z1": -1500,
   "r": 5500,
   "holes": [
    {
     "circle": [
      0,
      0,
      450
     ]
    },
    {
     "circle": [
      0,
      4400,
      450
     ]
    }
   ]
  },
  {
   "id": "neck_1",
   "name": "맨홀 목 1",
   "kind": "neck",
   "type": "prism",
   "color": "#b8b8b8",
   "polygon": [
    [
     650,
     -650
    ],
    [
     -650,
     -650
    ],
    [
     -650,
     650
    ],
    [
     650,
     650
    ]
   ],
   "z0": -1500,
   "z1": 0,
   "holes": [
    {
     "circle": [
      0,
      0,
      450
     ]
    }
   ]
  },
  {
   "id": "neck_2",
   "name": "맨홀 목 2",
   "kind": "neck",
   "type": "prism",
   "color": "#b8b8b8",
   "polygon": [
    [
     650,
     5050
    ],
    [
     650,
     3750
    ],
    [
     -650,
     3750
    ],
    [
     -650,
     5050
    ]
   ],
   "z0": -1500,
   "z1": 0,
   "holes": [
    {
     "circle": [
      0,
      4400,
      450
     ]
    }
   ]
  },
  {
   "id": "slab_1B",
   "name": "1B 슬래브",
   "kind": "slab",
   "type": "disc",
   "color": "#c8c8c8",
   "cx": 0,
   "cy": 0,
   "z0": -7700,
   "z1": -7400,
   "r": 4850,
   "holes": [
    [
     [
      -2100,
      0
     ],
     [
      -2100,
      1000
     ],
     [
      2100,
      1000
     ],
     [
      2100,
      0
     ]
    ],
    [
     [
      1250,
      2200
     ],
     [
      1250,
      1000
     ],
     [
      -1250,
      1000
     ],
     [
      -1250,
      2200
     ]
    ],
    [
     [
      2228,
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     ],
     [
      2078,
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     ],
     [
      2914,
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     ],
     [
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     ]
    ],
    [
     [
      1250,
      -1000
     ],
     [
      1250,
      -2200
     ],
     [
      -1250,
      -2200
     ],
     [
      -1250,
      -1000
     ]
    ],
    [
     [
      -749,
      4789
     ],
     [
      -747,
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     ],
     [
      753,
      3648
     ],
     [
      751,
      4792
     ]
    ]
   ]
  },
  {
   "id": "slab_2B",
   "name": "2B 슬래브",
   "kind": "slab",
   "type": "disc",
   "color": "#c8c8c8",
   "cx": 0,
   "cy": 0,
   "z0": -11000,
   "z1": -10700,
   "r": 4850,
   "holes": [
    [
     [
      2100,
      0
     ],
     [
      2100,
      -1000
     ],
     [
      -2100,
      -1000
     ],
     [
      -2100,
      0
     ]
    ],
    [
     [
      1250,
      2200
     ],
     [
      1250,
      1000
     ],
     [
      -1250,
      1000
     ],
     [
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     ]
    ],
    [
     [
      1250,
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     [
      1250,
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     [
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      -2200
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     [
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     ]
    ],
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     [
      755,
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     [
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     ]
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     [
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     ],
     [
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     ],
     [
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     ],
     [
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     ]
    ]
   ]
  },
  {
   "id": "slab_3B",
   "name": "3B 슬래브",
   "kind": "slab",
   "type": "disc",
   "color": "#c8c8c8",
   "cx": 0,
   "cy": 0,
   "z0": -14300,
   "z1": -14000,
   "r": 4850,
   "holes": [
    [
     [
      -2100,
      0
     ],
     [
      -2100,
      1000
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      2100,
      1000
     ],
     [
      2100,
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     ]
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     [
      1250,
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     ],
     [
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     ]
    ]
   ]
  },
  {
   "id": "slab_4B",
   "name": "4B 슬래브",
   "kind": "slab",
   "type": "disc",
   "color": "#c8c8c8",
   "cx": 0,
   "cy": 0,
   "z0": -17600,
   "z1": -17300,
   "r": 4850,
   "holes": [
    [
     [
      2100,
      0
     ],
     [
      2100,
      -1000
     ],
     [
      -2100,
      -1000
     ],
     [
      -2100,
      0
     ]
    ],
    [
     [
      1250,
      2200
     ],
     [
      1250,
      1000
     ],
     [
      -1250,
      1000
     ],
     [
      -1250,
      2200
     ]
    ],
    [
     [
      1250,
      -1000
     ],
     [
      1250,
      -2200
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     [
      -1250,
      -2200
     ],
     [
      -1250,
      -1000
     ]
    ],
    [
     [
      -747,
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     ],
     [
      -745,
      3649
     ],
     [
      755,
      3651
     ],
     [
      753,
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     ]
    ],
    [
     [
      2228,
      4308
     ],
     [
      2078,
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     ],
     [
      2914,
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     ],
     [
      3065,
      3759
     ]
    ]
   ]
  },
  {
   "id": "slab_5B",
   "name": "5B 슬래브",
   "kind": "slab",
   "type": "disc",
   "color": "#c8c8c8",
   "cx": 0,
   "cy": 0,
   "z0": -20900,
   "z1": -20600,
   "r": 4850,
   "holes": [
    [
     [
      -2100,
      0
     ],
     [
      -2100,
      1000
     ],
     [
      2100,
      1000
     ],
     [
      2100,
      0
     ]
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    [
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      1250,
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     ],
     [
      1250,
      1000
     ],
     [
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     ],
     [
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     ]
    ],
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     [
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    ],
    [
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     ],
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     ]
    ]
   ]
  },
  {
   "id": "slab_6B",
   "name": "6B 슬래브",
   "kind": "slab",
   "type": "disc",
   "color": "#c8c8c8",
   "cx": 0,
   "cy": 0,
   "z0": -24200,
   "z1": -23900,
   "r": 4850,
   "holes": [
    [
     [
      2100,
      0
     ],
     [
      2100,
      -1000
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     [
      -2100,
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     [
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      0
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      2200
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      1000
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   ]
  },
  {
   "id": "slab_7B",
   "name": "7B 슬래브",
   "kind": "slab",
   "type": "disc",
   "color": "#c8c8c8",
   "cx": 0,
   "cy": 0,
   "z0": -27500,
   "z1": -27200,
   "r": 4850,
   "holes": [
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     [
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      0
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   ]
  },
  {
   "id": "slab_8B",
   "name": "8B 슬래브",
   "kind": "slab",
   "type": "disc",
   "color": "#c8c8c8",
   "cx": 0,
   "cy": 0,
   "z0": -30800,
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   "r": 4850,
   "holes": [
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  },
  {
   "id": "slab_9B",
   "name": "9B 슬래브",
   "kind": "slab",
   "type": "disc",
   "color": "#c8c8c8",
   "cx": 0,
   "cy": 0,
   "z0": -34100,
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   "r": 4850,
   "holes": [
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     [
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  },
  {
   "id": "slab_10B",
   "name": "10B 슬래브",
   "kind": "slab",
   "type": "disc",
   "color": "#c8c8c8",
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  },
  {
   "id": "slab_11B",
   "name": "11B 슬래브",
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   "type": "disc",
   "color": "#c8c8c8",
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   ]
  },
  {
   "id": "slab_14B",
   "name": "14B 슬래브",
   "kind": "slab",
   "type": "disc",
   "color": "#c8c8c8",
   "cx": 0,
   "cy": 0,
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   "riser": 200,
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   "y0": 0,
   "y1": 1000
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   "y1": 1000
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   "riser": 200,
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   "y1": 0
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   "riser": 200,
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   "y0": 0,
   "y1": 1000
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   "id": "stair_10",
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   "riser": 200,
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   "y0": -1000,
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   "riser": 200,
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   "y1": 1000
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   "riser": 200,
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   "y0": -1000,
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   "riser": 200,
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   "y0": 0,
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   "z_low": -53600,
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   "first_riser": 100,
   "riser": 200,
   "tread": 300,
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   "y0": -1000,
   "y1": 0
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   "id": "stair_15",
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   "z_low": -56900,
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   "riser": 200,
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   "y0": 0,
   "y1": 1000
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   "z_low": -60200,
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   "riser": 200,
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   "y0": -1000,
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   "riser": 200,
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   "y0": 0,
   "y1": 1000
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   "r": 1300,
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   "name": "분기구 지붕",
   "kind": "branch",
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