blockstate - example

{
    "variants": {
        "facing=up": { "model": "TestEnvironmentMod:Armchair" },
        "facing=south": { "model": "TestEnvironmentMod:Armchair" },
        "facing=east": { "model": "TestEnvironmentMod:Armchair", "y": 270 },
        "facing=west": { "model": "TestEnvironmentMod:Armchair", "y": 90 },
        "facing=north": { "model": "TestEnvironmentMod:Armchair", "y": 180 }
    }
}