VoxeLibre/mods/MAPGEN/mcl_mapgen_core/init.lua

--
-- Aliases for map generator outputs
--

mcl_mapgen_core = {}

minetest.register_alias("mapgen_air", "air")
minetest.register_alias("mapgen_stone", "mcl_core:stone")
minetest.register_alias("mapgen_tree", "mcl_core:tree")
minetest.register_alias("mapgen_leaves", "mcl_core:leaves")
minetest.register_alias("mapgen_jungletree", "mcl_core:jungletree")
minetest.register_alias("mapgen_jungleleaves", "mcl_core:jungleleaves")
minetest.register_alias("mapgen_pine_tree", "mcl_core:sprucetree")
minetest.register_alias("mapgen_pine_needles", "mcl_core:spruceleaves")

minetest.register_alias("mapgen_apple", "mcl_core:leaves")
minetest.register_alias("mapgen_water_source", "mcl_core:water_source")
minetest.register_alias("mapgen_dirt", "mcl_core:dirt")
minetest.register_alias("mapgen_dirt_with_grass", "mcl_core:dirt_with_grass")
minetest.register_alias("mapgen_dirt_with_snow", "mcl_core:dirt_with_snow")
minetest.register_alias("mapgen_sand", "mcl_core:sand")
minetest.register_alias("mapgen_gravel", "mcl_core:gravel")
minetest.register_alias("mapgen_clay", "mcl_core:clay")
minetest.register_alias("mapgen_lava_source", "mcl_core:lava_source")
minetest.register_alias("mapgen_cobble", "mcl_core:cobble")
minetest.register_alias("mapgen_mossycobble", "mcl_core:mossycobble")
minetest.register_alias("mapgen_junglegrass", "mcl_flowers:fern")
minetest.register_alias("mapgen_stone_with_coal", "mcl_core:stone_with_coal")
minetest.register_alias("mapgen_stone_with_iron", "mcl_core:stone_with_iron")
minetest.register_alias("mapgen_desert_sand", "mcl_core:sand")
minetest.register_alias("mapgen_desert_stone", "mcl_core:sandstone")
minetest.register_alias("mapgen_sandstone", "mcl_core:sandstone")
minetest.register_alias("mapgen_river_water_source", "mcl_core:water_source")
minetest.register_alias("mapgen_snow", "mcl_core:snow")
minetest.register_alias("mapgen_snowblock", "mcl_core:snowblock")
minetest.register_alias("mapgen_ice", "mcl_core:ice")

minetest.register_alias("mapgen_stair_cobble", "stairs:stair_cobble")
minetest.register_alias("mapgen_sandstonebrick", "mcl_core:sandstonesmooth")
minetest.register_alias("mapgen_stair_sandstonebrick", "stairs:stair_sandstone")

--
-- Ore generation
--

-- Gravel
minetest.register_ore({
	ore_type       = "blob",
	ore            = "mcl_core:gravel",
	wherein        = {"mcl_core:stone"},
	clust_scarcity = 14*14*14,
	clust_num_ores = 33,
	clust_size     = 5,
	y_min          = mcl_vars.mg_overworld_min,
	y_max          = mcl_util.layer_to_y(111),
})

-- Dirt
minetest.register_ore({
	ore_type       = "blob",
	ore            = "mcl_core:dirt",
	wherein        = {"mcl_core:stone"},
	clust_scarcity = 15*15*15,
	clust_num_ores = 33,
	clust_size     = 4,
	y_min          = mcl_vars.mg_overworld_min,
	y_max          = mcl_vars.mg_overworld_max,
})

-- Diorite, andesite and granite
local specialstones = { "mcl_core:diorite", "mcl_core:andesite", "mcl_core:granite" }
for s=1, #specialstones do
	local node = specialstones[s]
	minetest.register_ore({
		ore_type       = "blob",
		ore            = node,
		wherein        = {"mcl_core:stone"},
		clust_scarcity = 15*15*15,
		clust_num_ores = 33,
		clust_size     = 5,
		y_min          = mcl_vars.mg_overworld_min,
		y_max          = mcl_vars.mg_overworld_max,
	})
	minetest.register_ore({
		ore_type       = "blob",
		ore            = node,
		wherein        = {"mcl_core:stone"},
		clust_scarcity = 10*10*10,
		clust_num_ores = 58,
		clust_size     = 7,
		y_min          = mcl_vars.mg_overworld_min,
		y_max          = mcl_vars.mg_overworld_max,
	})
end

--
-- Coal
--

-- Common spawn
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_coal",
	wherein        = "mcl_core:stone",
	clust_scarcity = 525*3,
	clust_num_ores = 5,
	clust_size     = 3,
	y_min          = mcl_vars.mg_overworld_min,
	y_max          = mcl_util.layer_to_y(50),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_coal",
	wherein        = "mcl_core:stone",
	clust_scarcity = 510*3,
	clust_num_ores = 8,
	clust_size     = 3,
	y_min          = mcl_vars.mg_overworld_min,
	y_max          = mcl_util.layer_to_y(50),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_coal",
	wherein        = "mcl_core:stone",
	clust_scarcity = 500*3,
	clust_num_ores = 12,
	clust_size     = 3,
	y_min          = mcl_vars.mg_overworld_min,
	y_max          = mcl_util.layer_to_y(50),
})

-- Medium-rare spawn
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_coal",
	wherein        = "mcl_core:stone",
	clust_scarcity = 550*3,
	clust_num_ores = 4,
	clust_size     = 2,
	y_min          = mcl_util.layer_to_y(51),
	y_max          = mcl_util.layer_to_y(80),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_coal",
	wherein        = "mcl_core:stone",
	clust_scarcity = 525*3,
	clust_num_ores = 6,
	clust_size     = 3,
	y_min          = mcl_util.layer_to_y(51),
	y_max          = mcl_util.layer_to_y(80),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_coal",
	wherein        = "mcl_core:stone",
	clust_scarcity = 500*3,
	clust_num_ores = 8,
	clust_size     = 3,
	y_min          = mcl_util.layer_to_y(51),
	y_max          = mcl_util.layer_to_y(80),
})

-- Rare spawn
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_coal",
	wherein        = "mcl_core:stone",
	clust_scarcity = 600*3,
	clust_num_ores = 3,
	clust_size     = 2,
	y_min          = mcl_util.layer_to_y(81),
	y_max          = mcl_util.layer_to_y(128),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_coal",
	wherein        = "mcl_core:stone",
	clust_scarcity = 550*3,
	clust_num_ores = 4,
	clust_size     = 3,
	y_min          = mcl_util.layer_to_y(81),
	y_max          = mcl_util.layer_to_y(128),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_coal",
	wherein        = "mcl_core:stone",
	clust_scarcity = 500*3,
	clust_num_ores = 5,
	clust_size     = 3,
	y_min          = mcl_util.layer_to_y(81),
	y_max          = mcl_util.layer_to_y(128),
})

--
-- Iron
--
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_iron",
	wherein        = "mcl_core:stone",
	clust_scarcity = 830,
	clust_num_ores = 5,
	clust_size     = 3,
	y_min          = mcl_vars.mg_overworld_min,
	y_max          = mcl_util.layer_to_y(39),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_iron",
	wherein        = "mcl_core:stone",
	clust_scarcity = 1660,
	clust_num_ores = 4,
	clust_size     = 2,
	y_min          = mcl_util.layer_to_y(40),
	y_max          = mcl_util.layer_to_y(63),
})

--
-- Gold
--

-- Common spawn
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_gold",
	wherein        = "mcl_core:stone",
	clust_scarcity = 4775,
	clust_num_ores = 5,
	clust_size     = 3,
	y_min          = mcl_vars.mg_overworld_min,
	y_max          = mcl_util.layer_to_y(30),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_gold",
	wherein        = "mcl_core:stone",
	clust_scarcity = 6560,
	clust_num_ores = 7,
	clust_size     = 3,
	y_min          = mcl_vars.mg_overworld_min,
	y_max          = mcl_util.layer_to_y(30),
})

-- Rare spawn
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_gold",
	wherein        = "mcl_core:stone",
	clust_scarcity = 13000,
	clust_num_ores = 4,
	clust_size     = 2,
	y_min          = mcl_util.layer_to_y(31),
	y_max          = mcl_util.layer_to_y(33),
})




--
-- Diamond
--

-- Common spawn
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_diamond",
	wherein        = "mcl_core:stone",
	clust_scarcity = 10000,
	clust_num_ores = 4,
	clust_size     = 3,
	y_min          = mcl_vars.mg_overworld_min,
	y_max          = mcl_util.layer_to_y(12),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_diamond",
	wherein        = "mcl_core:stone",
	clust_scarcity = 5000,
	clust_num_ores = 2,
	clust_size     = 2,
	y_min          = mcl_vars.mg_overworld_min,
	y_max          = mcl_util.layer_to_y(12),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_diamond",
	wherein        = "mcl_core:stone",
	clust_scarcity = 10000,
	clust_num_ores = 8,
	clust_size     = 3,
	y_min          = mcl_vars.mg_overworld_min,
	y_max          = mcl_util.layer_to_y(12),
})

-- Rare spawn
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_diamond",
	wherein        = "mcl_core:stone",
	clust_scarcity = 20000,
	clust_num_ores = 1,
	clust_size     = 1,
	y_min          = mcl_util.layer_to_y(13),
	y_max          = mcl_util.layer_to_y(15),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_diamond",
	wherein        = "mcl_core:stone",
	clust_scarcity = 20000,
	clust_num_ores = 2,
	clust_size     = 2,
	y_min          = mcl_util.layer_to_y(13),
	y_max          = mcl_util.layer_to_y(15),
})

--
-- Redstone
--

-- Common spawn
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_redstone",
	wherein        = "mcl_core:stone",
	clust_scarcity = 500,
	clust_num_ores = 4,
	clust_size     = 3,
	y_min          = mcl_vars.mg_overworld_min,
	y_max          = mcl_util.layer_to_y(13),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_redstone",
	wherein        = "mcl_core:stone",
	clust_scarcity = 800,
	clust_num_ores = 7,
	clust_size     = 4,
	y_min          = mcl_vars.mg_overworld_min,
	y_max          = mcl_util.layer_to_y(13),
})

-- Rare spawn
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_redstone",
	wherein        = "mcl_core:stone",
	clust_scarcity = 1000,
	clust_num_ores = 4,
	clust_size     = 3,
	y_min          = mcl_util.layer_to_y(13),
	y_max          = mcl_util.layer_to_y(15),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_redstone",
	wherein        = "mcl_core:stone",
	clust_scarcity = 1600,
	clust_num_ores = 7,
	clust_size     = 4,
	y_min          = mcl_util.layer_to_y(13),
	y_max          = mcl_util.layer_to_y(15),
})

--
-- Emerald
--

-- Common spawn
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_emerald",
	wherein        = "mcl_core:stone",
	clust_scarcity = 14340,
	clust_num_ores = 1,
	clust_size     = 1,
	y_min          = mcl_vars.mg_overworld_min,
	y_max          = mcl_util.layer_to_y(29),
})
-- Rare spawn
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_emerald",
	wherein        = "mcl_core:stone",
	clust_scarcity = 21510,
	clust_num_ores = 1,
	clust_size     = 1,
	y_min          = mcl_util.layer_to_y(30),
	y_max          = mcl_util.layer_to_y(32),
})

--
-- Lapis Lazuli
--

-- Common spawn (in the center)
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_lapis",
	wherein        = "mcl_core:stone",
	clust_scarcity = 10000,
	clust_num_ores = 7,
	clust_size     = 4,
	y_min          = mcl_util.layer_to_y(14),
	y_max          = mcl_util.layer_to_y(16),
})

-- Rare spawn (below center)
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_lapis",
	wherein        = "mcl_core:stone",
	clust_scarcity = 12000,
	clust_num_ores = 6,
	clust_size     = 3,
	y_min          = mcl_util.layer_to_y(10),
	y_max          = mcl_util.layer_to_y(13),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_lapis",
	wherein        = "mcl_core:stone",
	clust_scarcity = 14000,
	clust_num_ores = 5,
	clust_size     = 3,
	y_min          = mcl_util.layer_to_y(6),
	y_max          = mcl_util.layer_to_y(9),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_lapis",
	wherein        = "mcl_core:stone",
	clust_scarcity = 16000,
	clust_num_ores = 4,
	clust_size     = 3,
	y_min          = mcl_util.layer_to_y(2),
	y_max          = mcl_util.layer_to_y(5),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_lapis",
	wherein        = "mcl_core:stone",
	clust_scarcity = 18000,
	clust_num_ores = 3,
	clust_size     = 2,
	y_min          = mcl_util.layer_to_y(0),
	y_max          = mcl_util.layer_to_y(2),
})

-- Rare spawn (above center)
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_lapis",
	wherein        = "mcl_core:stone",
	clust_scarcity = 12000,
	clust_num_ores = 6,
	clust_size     = 3,
	y_min          = mcl_util.layer_to_y(17),
	y_max          = mcl_util.layer_to_y(20),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_lapis",
	wherein        = "mcl_core:stone",
	clust_scarcity = 14000,
	clust_num_ores = 5,
	clust_size     = 3,
	y_min          = mcl_util.layer_to_y(21),
	y_max          = mcl_util.layer_to_y(24),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_lapis",
	wherein        = "mcl_core:stone",
	clust_scarcity = 16000,
	clust_num_ores = 4,
	clust_size     = 3,
	y_min          = mcl_util.layer_to_y(25),
	y_max          = mcl_util.layer_to_y(28),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_lapis",
	wherein        = "mcl_core:stone",
	clust_scarcity = 18000,
	clust_num_ores = 3,
	clust_size     = 2,
	y_min          = mcl_util.layer_to_y(29),
	y_max          = mcl_util.layer_to_y(32),
})
minetest.register_ore({
	ore_type       = "scatter",
	ore            = "mcl_core:stone_with_lapis",
	wherein        = "mcl_core:stone",
	clust_scarcity = 32000,
	clust_num_ores = 1,
	clust_size     = 1,
	y_min          = mcl_util.layer_to_y(31),
	y_max          = mcl_util.layer_to_y(32),
})

local function register_mgv6_decorations()

	-- Sugar canes

	minetest.register_decoration({
		deco_type = "simple",
		place_on = {"mcl_core:dirt_with_grass"},
		sidelen = 16,
		noise_params = {
			offset = -0.3,
			scale = 0.7,
			spread = {x = 100, y = 100, z = 100},
			seed = 2,
			octaves = 3,
			persist = 0.7
		},
		y_min = 1,
		y_max = 1,
		decoration = "mcl_core:reeds",
		height = 2,
		height_max = 4,
		spawn_by = "mcl_core:water_source",
		num_spawn_by = 1,
	})

	-- Cacti

	minetest.register_decoration({
		deco_type = "simple",
		place_on = {"mcl_core:sand", "mcl_core:redsand"},
		sidelen = 16,
		noise_params = {
			offset = -0.012,
			scale = 0.024,
			spread = {x = 100, y = 100, z = 100},
			seed = 257,
			octaves = 3,
			persist = 0.6
		},
		y_min = 4,
		y_max = 30,
		decoration = "mcl_core:cactus",
		height = 1,
	        height_max = 3,
	})

	-- Tall grass
	minetest.register_decoration({
		deco_type = "simple",
		place_on = {"mcl_core:dirt_with_grass"},
		sidelen = 8,
		noise_params = {
			offset = 0.01,
			scale = 0.3,
			spread = {x = 500, y = 500, z = 500},
			seed = 420,
			octaves = 2,
			persist = 0.6
		},
		y_min = 1,
		y_max = 50,
		decoration = "mcl_flowers:tallgrass",
	})

	-- Add a small amount of tall grass everywhere to avoid areas completely empty devoid of tall grass
	minetest.register_decoration({
		deco_type = "simple",
		place_on = {"mcl_core:dirt_with_grass"},
		sidelen = 8,
		fill_ratio = 0.001,
		y_min = 1,
		y_max = 50,
		decoration = "mcl_flowers:tallgrass",
	})

	-- Doubletall grass
	minetest.register_decoration({
		deco_type = "schematic",
		schematic = {
			size = { x=1, y=3, z=1 },
			data = {
				{ name = "air", prob = 0 },
				{ name = "mcl_flowers:double_grass", param1=255, },
				{ name = "mcl_flowers:double_grass_top", param1=255, },
			},
		},
		replacements = {
			["mcl_flowers:tallgrass"] = "mcl_flowers:double_grass"
		},
		place_on = {"mcl_core:dirt_with_grass"},
		sidelen = 8,
		noise_params = {
			offset = -0.01,
			scale = 0.03,
			spread = {x = 500, y = 500, z = 500},
			seed = 420,
			octaves = 2,
			persist = 0.6,
		},
		y_min = 1,
		y_max = 40,
		flags = "",
	})

	-- Large ferns
	minetest.register_decoration({
		deco_type = "schematic",
		schematic = {
			size = { x=1, y=3, z=1 },
			data = {
				{ name = "air", prob = 0 },
				{ name = "mcl_flowers:double_fern", param1=255, },
				{ name = "mcl_flowers:double_fern_top", param1=255, },
			},
		},
		replacements = {
			["mcl_flowers:fern"] = "mcl_flowers:double_fern"
		},
		-- This makes sure large ferns only appear in jungles
		spawn_by = { "mcl_core:jungletree", "mcl_flowers:fern" },
		num_spawn_by = 1,
		place_on = {"mcl_core:dirt_with_grass"},

		sidelen = 16,
		noise_params = {
			offset = 0,
			scale = 0.01,
			spread = {x = 250, y = 250, z = 250},
			seed = 333,
			octaves = 2,
			persist = 0.66,
		},
		y_min = 1,
		y_max = 30,
		flags = "",
	})

	-- Large flowers
	local register_large_flower = function(name, seed, offset)
		minetest.register_decoration({
			deco_type = "schematic",
			schematic = {
				size = { x=1, y=3, z=1 },
				data = {
					{ name = "air", prob = 0 },
					{ name = "mcl_flowers:"..name, param1=255, },
					{ name = "mcl_flowers:"..name.."_top", param1=255, },
				},
			},
			place_on = {"mcl_core:dirt_with_grass"},

			sidelen = 16,
			noise_params = {
				offset = offset,
				scale = 0.01,
				spread = {x = 300, y = 300, z = 300},
				seed = seed,
				octaves = 5,
				persist = 0.62,
			},
			y_min = 1,
			y_max = 30,
			flags = "",
		})
	end

	register_large_flower("rose_bush", 9350, -0.008)
	register_large_flower("peony", 10450, -0.008)
	register_large_flower("lilac", 10600, -0.007)
	register_large_flower("sunflower", 2940, -0.005)

	-- Dead bushes

	minetest.register_decoration({
		deco_type = "simple",
		place_on = {"mcl_core:sand", "mcl_core:redsand", "mcl_core:podzol", "mcl_core:coarse_dirt", "mcl_colorblocks:hardened_clay"},
		sidelen = 16,
		noise_params = {
			offset = 0,
			scale = 0.035,
			spread = {x = 100, y = 100, z = 100},
			seed = 1972,
			octaves = 3,
			persist = 0.6
		},
		y_min = 4,
		y_max = 50,
		decoration = "mcl_core:deadbush",
	})

	local function register_mgv6_flower(name, seed)
		minetest.register_decoration({
			deco_type = "simple",
			place_on = {"mcl_core:dirt_with_grass"},
			sidelen = 16,
			noise_params = {
				offset = 0,
				scale = 0.006,
				spread = {x = 100, y = 100, z = 100},
				seed = seed,
				octaves = 3,
				persist = 0.6
			},
			y_min = 1,
			y_max = 30,
			decoration = "mcl_flowers:"..name,
		})
	end

	register_mgv6_flower("tulip_red",  436)
	register_mgv6_flower("tulip_orange", 536)
	register_mgv6_flower("tulip_pink", 636)
	register_mgv6_flower("tulip_white", 736)
	register_mgv6_flower("azure_bluet", 800)
	register_mgv6_flower("dandelion", 8)
	register_mgv6_flower("allium", 0)
	register_mgv6_flower("blue_orchid", 64500)
	register_mgv6_flower("oxeye_daisy", 3490)
	register_mgv6_flower("poppy", 9439)

end

minetest.register_on_generated(function(minp, maxp, seed)
	if maxp.y >= 2 and minp.y <= 0 then
		-- Generate clay
		-- Assume X and Z lengths are equal
		local divlen = 4
		local divs = (maxp.x-minp.x)/divlen+1;
		for divx=0+1,divs-1-1 do
		for divz=0+1,divs-1-1 do
			local cx = minp.x + math.floor((divx+0.5)*divlen)
			local cz = minp.z + math.floor((divz+0.5)*divlen)
			if minetest.get_node({x=cx,y=1,z=cz}).name == "mcl_core:water_source" and
					minetest.get_node({x=cx,y=0,z=cz}).name == "mcl_core:sand" then
				local is_shallow = true
				local num_water_around = 0
				if minetest.get_node({x=cx-divlen*2,y=1,z=cz+0}).name == "mcl_core:water_source" then
					num_water_around = num_water_around + 1 end
				if minetest.get_node({x=cx+divlen*2,y=1,z=cz+0}).name == "mcl_core:water_source" then
					num_water_around = num_water_around + 1 end
				if minetest.get_node({x=cx+0,y=1,z=cz-divlen*2}).name == "mcl_core:water_source" then
					num_water_around = num_water_around + 1 end
				if minetest.get_node({x=cx+0,y=1,z=cz+divlen*2}).name == "mcl_core:water_source" then
					num_water_around = num_water_around + 1 end
				if num_water_around >= 2 then
					is_shallow = false
				end	
				if is_shallow then
					for x1=-divlen,divlen do
					for z1=-divlen,divlen do
						if minetest.get_node({x=cx+x1,y=0,z=cz+z1}).name == "mcl_core:sand" or minetest.get_node({x=cx+x1,y=0,z=cz+z1}).name == "mcl_core:sandstone" then
							minetest.set_node({x=cx+x1,y=0,z=cz+z1}, {name="mcl_core:clay"})
						end
					end
					end
				end
			end
		end
		end
		-- Generate reeds
		local perlin1 = minetest.get_perlin(354, 3, 0.7, 100)
		-- Assume X and Z lengths are equal
		local divlen = 8
		local divs = (maxp.x-minp.x)/divlen+1;
		for divx=0,divs-1 do
		for divz=0,divs-1 do
			local x0 = minp.x + math.floor((divx+0)*divlen)
			local z0 = minp.z + math.floor((divz+0)*divlen)
			local x1 = minp.x + math.floor((divx+1)*divlen)
			local z1 = minp.z + math.floor((divz+1)*divlen)
			-- Determine reeds amount from perlin noise
			local reeds_amount = math.floor(perlin1:get2d({x=x0, y=z0}) * 45 - 20)
			-- Find random positions for reeds based on this random
			local pr = PseudoRandom(seed+1)
			for i=0,reeds_amount do
				local x = pr:next(x0, x1)
				local z = pr:next(z0, z1)
				local p = {x=x,y=1,z=z}
				if minetest.get_node(p).name == "mcl_core:sand" then
					if math.random(0,1000) == 1 then -- 0,12000
						-- Spawn sand temple
						random_struct.call_struct(p,2)
					end
				end

			end
		end
		end
		-- Generate grass
		local perlin1 = minetest.get_perlin(329, 3, 0.6, 100)
		-- Assume X and Z lengths are equal
		local divlen = 5
		local divs = (maxp.x-minp.x)/divlen+1;
		for divx=0,divs-1 do
		for divz=0,divs-1 do
			local x0 = minp.x + math.floor((divx+0)*divlen)
			local z0 = minp.z + math.floor((divz+0)*divlen)
			local x1 = minp.x + math.floor((divx+1)*divlen)
			local z1 = minp.z + math.floor((divz+1)*divlen)
			-- Determine grass amount from perlin noise
			local grass_amount = math.floor(perlin1:get2d({x=x0, y=z0}) * 9)
			-- Find random positions for grass based on this random
			local pr = PseudoRandom(seed+1)
			for i=0,grass_amount do
				local x = pr:next(x0, x1)
				local z = pr:next(z0, z1)
				-- Find ground level (0...15)
				local ground_y = nil
				for y=30,0,-1 do
					if minetest.get_node({x=x,y=y,z=z}).name ~= "air" then
						ground_y = y
						break
					end
				end
				
				if ground_y then
					local p = {x=x,y=ground_y+1,z=z}
					local nn = minetest.get_node(p).name
					-- Check if the node can be replaced
					if minetest.registered_nodes[nn] and
						minetest.registered_nodes[nn].buildable_to then
						nn = minetest.get_node({x=x,y=ground_y,z=z}).name
						if nn == "mcl_core:dirt_with_grass" then
							if math.random(0,12000) == 1 then 
								-- Spawn town
								-- TODO: Re-enable random_struct
								-- Towns often float around in air which doesn't look nice
								--random_struct.call_struct(p,1)
							end
						end
					end
				end
				
			end
		end
		end
	end
end)


-- Generate bedrock layer or layers
local BEDROCK_MIN = mcl_vars.mg_bedrock_overworld_min
local BEDROCK_MAX = mcl_vars.mg_bedrock_overworld_max

-- Below the bedrock, generate air/void

minetest.register_on_generated(function(minp, maxp)
	if minp.y <= BEDROCK_MAX then
		local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
		local data = vm:get_data()
		local area = VoxelArea:new({MinEdge=emin, MaxEdge=emax})
		local c_bedrock = minetest.get_content_id("mcl_core:bedrock")
		local c_void = minetest.get_content_id("mcl_core:void")

		for y = minp.y, math.min(maxp.y, BEDROCK_MAX) do
			for x = minp.x, maxp.x do
				for z = minp.z, maxp.z do
					local p_pos = area:index(x, y, z)
					local setdata = nil
					if mcl_vars.mg_bedrock_is_rough then
						-- Bedrock layers with increasing levels of roughness, until a perfecly flat bedrock later at the bottom layer
						-- This code assumes a bedrock height of 5 layers.
						if y == BEDROCK_MAX then
							-- 50% bedrock chance
							if math.random(1,2) == 1 then setdata = c_bedrock end
						elseif y == BEDROCK_MAX -1 then
							-- 66.666...%
							if math.random(1,3) <= 2 then setdata = c_bedrock end
						elseif y == BEDROCK_MAX -2 then
							-- 75%
							if math.random(1,4) <= 3 then setdata = c_bedrock end
						elseif y == BEDROCK_MAX -3 then
							-- 90%
							if math.random(1,10) <= 9 then setdata = c_bedrock end
						elseif y == BEDROCK_MAX -4 then
							-- 100%
							setdata = c_bedrock
						elseif y < BEDROCK_MIN then
							setdata = c_void
						end
					else
						-- Perfectly flat bedrock layer(s)
						if y >= BEDROCK_MIN and y <= BEDROCK_MAX then
							setdata = c_bedrock
						elseif y < BEDROCK_MIN then
							setdata = c_void
						end
					end
					if setdata then
						data[p_pos] = setdata
					end
				end
			end
		end

		vm:set_data(data)
		vm:calc_lighting()
		vm:update_liquids()
		vm:write_to_map()
	end
end)

-- Apply mapgen-specific mapgen code
local mg_name = minetest.get_mapgen_setting("mg_name")
if mg_name == "v6" then
	register_mgv6_decorations()
end
if mg_name == "flat" then
	minetest.set_mapgen_setting("mg_flags", "nocaves,nodungeons,nodecorations")
else
	minetest.set_mapgen_setting("mg_flags", "nodungeons")
end