EnergonRelics/src/main/resources/assets/energonrelics/models/block/energy_portal.json

{
    "textures": {
        "particle": "#portal",
        "portal": "energonrelics:block/energy_portal"
    },
    "elements": [
        {
            "from": [0, 6, 0],
            "to": [16, 10, 16],
            "faces": {
                "up": {
                    "uv": [0, 0, 16, 16],
                    "texture": "#portal"
                },
                "down": {
                    "uv": [0, 0, 16, 16],
                    "texture": "#portal"
                }
            }
        }
    ]
}