MCMinecraft Assets Explorer

{
    "variants": {
        "facing=down":  { "model": "block/dropper_vertical", "x": 180 },
        "facing=up":    { "model": "block/dropper_vertical" },
        "facing=north": { "model": "block/dropper" },
        "facing=south": { "model": "block/dropper", "y": 180 },
        "facing=west":  { "model": "block/dropper", "y": 270 },
        "facing=east":  { "model": "block/dropper", "y": 90 }
    }
}