unit: 3 2 0 -1

verts:
    "0": "map_vert0"
    "1": "map_vert1"
edges:
    "0": "map_edge0"
    "1": "map_edge1"
    "2": "map_edge2"
faces:
    "0": "map_face0"
    "1": "map_face1"
    "2": "map_face2"
    "S": "map_savepoint"
    "D": "map_door"
    "w": frame_offset(1) "map_water"