fire.json

{
    "multipart": [
        {   "when": {"north": false, "east": false, "south": false, "west": false, "up": false},
            "apply": [
                { "model": "minecraft:fire_floor0" },
                { "model": "minecraft:fire_floor1" }
            ]
        },
        {   "when": {"OR": [{"north": true}, {"north": false, "east": false, "south": false, "west": false, "up": false}]},
            "apply": [
                { "model": "minecraft:fire_side0" },
                { "model": "minecraft:fire_side1" },
                { "model": "minecraft:fire_side_alt0" },
                { "model": "minecraft:fire_side_alt1" }
            ]
        },
        {   "when": {"OR": [{"east": true}, {"north": false, "east": false, "south": false, "west": false, "up": false}]},
            "apply": [
                { "model": "minecraft:fire_side0", "y": 90 },
                { "model": "minecraft:fire_side1", "y": 90 },
                { "model": "minecraft:fire_side_alt0", "y": 90 },
                { "model": "minecraft:fire_side_alt1", "y": 90 }
            ]
        },
        {   "when": {"OR": [{"south": true}, {"north": false, "east": false, "south": false, "west": false, "up": false}]},
            "apply": [
                { "model": "minecraft:fire_side0", "y": 180 },
                { "model": "minecraft:fire_side1", "y": 180 },
                { "model": "minecraft:fire_side_alt0", "y": 180 },
                { "model": "minecraft:fire_side_alt1", "y": 180 }
            ]
        },
        {   "when": {"OR": [{"west": true}, {"north": false, "east": false, "south": false, "west": false, "up": false}]},
            "apply": [
                { "model": "minecraft:fire_side0", "y": 270 },
                { "model": "minecraft:fire_side1", "y": 270 },
                { "model": "minecraft:fire_side_alt0", "y": 270 },
                { "model": "minecraft:fire_side_alt1", "y": 270 }
            ]
        },
        {   "when": {"up": true},
            "apply": [
                { "model": "minecraft:fire_up0" },
                { "model": "minecraft:fire_up1" },
                { "model": "minecraft:fire_up_alt0" },
                { "model": "minecraft:fire_up_alt1" }
            ]
        }
    ]
}