{
    "variants": {
        "axis=y":    { "model": "oak_log" },
        "axis=z":     { "model": "oak_log", "x": 90 },
        "axis=x":     { "model": "oak_log", "x": 90, "y": 90 },
        "axis=none":   { "model": "oak_bark" }
    }
}