Applied-Energistics-2/src/main/resources/assets/appliedenergistics2/blockstates/interface.json

{
    "variants": {
        "omnidirectional=true": {
            "model": "appliedenergistics2:block/interface"
        },
        "omnidirectional=false": {
            "model": "appliedenergistics2:block/interface_oriented",
            "x": 90
        }
    }
}