minetest.register_decoration({
    deco_type = "simple",
    sidelen = 16,
    fill_ratio = 0.0003,
    place_on = {"group:ground"},
    y_max = PyuTestCore_BiomeTops.mountains,
    y_min = PyuTestCore_SurfaceBottom,
    decoration = {
      "pyutest_core:trash_lootbox",
      "pyutest_core:resource_lootbox",
      "pyutest_core:griefer_lootbox",
      "pyutest_core:liquid_sources_lootbox",
      "pyutest_core:lighting_lootbox",
    }
})

PyuTestMapgen.register_structure("igloo", "Igloo", {
    place_on = {"pyutest_core:snow_block"},
    fill_ratio = 0.00004,
    biomes = {"frozen_plains"},
    y_max = PyuTestCore_BiomeTops.frozen_plains,
    y_min = 1,
    rotation = "random",
    flags = "place_center_x, place_center_z",
    place_offset_y = 1
})

PyuTestMapgen.register_structure("desertwell", "DesertWell", {
    place_on = {"pyutest_core:sand_block"},
    fill_ratio = 0.00006,
    biomes = {"desert"},
    y_max = PyuTestCore_BiomeTops.desert,
    y_min = 1,
    rotation = "random"
})

PyuTestMapgen.register_structure("ice_spike", "IceSpike", {
    fill_ratio = 0.0008,
    place_on = {
      "pyutest_core:ice_block",
    },
    biomes = {
      "ice_spikes",
    },
    y_max = PyuTestCore_BiomeTops.ice_spikes,
    y_min = PyuTestCore_WorldBottom,
})

PyuTestMapgen.register_structure("ocean_ruins", "OceanRuins", {
    fill_ratio = 0.0002,
    place_on = {"pyutest_core:gravel_block"},
    biomes = PyuTestCore.get_biomes_from_type(PyuTestCore.BIOME_TYPES.OCEAN),
    y_max = PyuTestCore_DeepOceanMax + 4,
    y_min = PyuTestCore_DeepOceanMin,
    spawn_by = {"pyutest_core:water_source"},
    num_spawn_by = 2
})

PyuTestMapgen.register_structure("snowman_tower", "SnowmanTower", {
    fill_ratio = 0.000007,
    place_on = {
      "pyutest_core:ice_block",
      "pyutest_core:snow_block"
    },
    biomes = {
      "frozen_plains",
      "ice_spikes",
      "snowy_forest"
    },
    y_max = PyuTestCore_BiomeTops.forest,
    y_min = PyuTestCore_WorldBottom,
})