register_decoration

init.lua

minetest.register_decoration({
	name = "seaweed:seaweed",
	deco_type = "simple",
	place_on = {"default:sand"},
	place_offset_y = -1,
	sidelen = 16,
	noise_params = {
		offset = 1,
		scale = 1,
		spread = {x = 100, y = 100, z = 100},
		seed = 1337,
		octaves = 3,
		persist = 0.7
	},
	biomes = {
		"taiga_ocean",
		"snowy_grassland_ocean",
		"grassland_ocean",
		"coniferous_forest_ocean",
		"deciduous_forest_ocean",
		"sandstone_desert_ocean",
		"cold_desert_ocean"},
	y_max = -5,
	y_min = -10,
	flags = "force_placement",
	decoration = {
		"seaweed:seaweed_1",
		"seaweed:seaweed_2",
		"seaweed:seaweed_3",
		"seaweed:seaweed_4",
		"seaweed:seaweed_5"
	},
	param2 = 32,
	param2_max = 32,
})