[
    // example entry, increase freq to activate
    (
        // ron file pointing to voxel model and defining special colors
        base_structures: "spots_general.mage_tower",
        // maximum occurance per each 1000km^2 world area
        freq: 0.0,
        // placement requirements
        condition: All([Typical, MaxGradient(0.2), Biome([Forest, Taiga])]),
        // whether to prevent trees etc. around this spot
        spawn: false,
    ),
]