ridable
両肩に2人乗ることが可能。
"seat_count": 2,
"family_types": [],
"seats": [{
"position": [ 0.5, 1.8, 0 ],
"lock_rider_rotation": 0
},
{
"position": [ -0.5, 1.8, 0 ],
"lock_rider_rotation": 0
}
]
}