New map

mods/default/mapgen.lua

@@ -2,7 +2,6 @@
 -- Aliases for map generator outputs
 --
 
-
 minetest.register_alias("mapgen_stone", "default:stone")
 minetest.register_alias("mapgen_dirt", "default:dirt")
 minetest.register_alias("mapgen_dirt_with_grass", "default:dirt_with_grass")
@@ -19,15 +18,19 @@ minetest.register_alias("mapgen_snow", "default:snow")
 minetest.register_alias("mapgen_ice", "default:ice")
 minetest.register_alias("mapgen_sandstone", "default:sandstone")
 
+-- Flora
+
 minetest.register_alias("mapgen_tree", "default:tree")
 minetest.register_alias("mapgen_leaves", "default:leaves")
 minetest.register_alias("mapgen_apple", "default:apple")
 minetest.register_alias("mapgen_jungletree", "default:jungletree")
 minetest.register_alias("mapgen_jungleleaves", "default:jungleleaves")
 minetest.register_alias("mapgen_junglegrass", "default:junglegrass")
-minetest.register_alias("mapgen_pinetree", "default:pinetree")
+minetest.register_alias("mapgen_pine_tree", "default:pine_tree")
 minetest.register_alias("mapgen_pine_needles", "default:pine_needles")
 
+-- Dungeons
+
 minetest.register_alias("mapgen_cobble", "default:cobble")
 minetest.register_alias("mapgen_stair_cobble", "stairs:stair_cobble")
 minetest.register_alias("mapgen_mossycobble", "default:mossycobble")
@@ -39,67 +42,98 @@ minetest.register_alias("mapgen_stair_sandstonebrick", "stairs:stair_sandstonebr
 -- Register ores
 --
 
-
+-- All mapgens except singlenode
 -- Blob ore first to avoid other ores inside blobs
 
 function default.register_ores()
+
+	-- Clay
+
 	minetest.register_ore({
-		ore_type         = "blob",
-		ore              = "default:sand",
-		wherein          = {"default:stone"},
-		clust_scarcity   = 24 * 24 * 24,
-		clust_size       = 7,
-		y_min            = -63,
-		y_max            = 4,
-		noise_threshhold = 0,
-		noise_params     = {
-			offset = 0.35,
+		ore_type        = "blob",
+		ore             = "default:clay",
+		wherein         = {"default:sand"},
+		clust_scarcity  = 16 * 16 * 16,
+		clust_size      = 5,
+		y_min           = -15,
+		y_max           = 0,
+		noise_threshold = 0.0,
+		noise_params    = {
+			offset = 0.5,
+			scale = 0.2,
+			spread = {x = 5, y = 5, z = 5},
+			seed = -316,
+			octaves = 1,
+			persist = 0.0
+		},
+	})
+
+	-- Sand
+
+	minetest.register_ore({
+		ore_type        = "blob",
+		ore             = "default:sand",
+		wherein         = {"default:stone", "default:sandstone",
+			"default:desert_stone"},
+		clust_scarcity  = 16 * 16 * 16,
+		clust_size      = 5,
+		y_min           = -31,
+		y_max           = 4,
+		noise_threshold = 0.0,
+		noise_params    = {
+			offset = 0.5,
 			scale = 0.2,
 			spread = {x = 5, y = 5, z = 5},
 			seed = 2316,
 			octaves = 1,
-			persist = 0.5
+			persist = 0.0
 		},
 	})
 
+	-- Dirt
+
 	minetest.register_ore({
-		ore_type         = "blob",
-		ore              = "default:dirt",
-		wherein          = {"default:stone"},
-		clust_scarcity   = 24 * 24 * 24,
-		clust_size       = 7,
-		y_min            = -63,
-		y_max            = 31000,
-		noise_threshhold = 0,
-		noise_params     = {
-			offset = 0.35,
+		ore_type        = "blob",
+		ore             = "default:dirt",
+		wherein         = {"default:stone", "default:sandstone"},
+		clust_scarcity  = 16 * 16 * 16,
+		clust_size      = 5,
+		y_min           = -31,
+		y_max           = 31000,
+		noise_threshold = 0.0,
+		noise_params    = {
+			offset = 0.5,
 			scale = 0.2,
 			spread = {x = 5, y = 5, z = 5},
 			seed = 17676,
 			octaves = 1,
-			persist = 0.5
+			persist = 0.0
 		},
 	})
 
+	-- Gravel
+
 	minetest.register_ore({
-		ore_type         = "blob",
-		ore              = "default:gravel",
-		wherein          = {"default:stone"},
-		clust_scarcity   = 24 * 24 * 24,
-		clust_size       = 7,
-		y_min            = -31000,
-		y_max            = 31000,
-		noise_threshhold = 0,
-		noise_params     = {
-			offset = 0.35,
+		ore_type        = "blob",
+		ore             = "default:gravel",
+		wherein         = {"default:stone"},
+		clust_scarcity  = 16 * 16 * 16,
+		clust_size      = 5,
+		y_min           = -31000,
+		y_max           = 31000,
+		noise_threshold = 0.0,
+		noise_params    = {
+			offset = 0.5,
 			scale = 0.2,
 			spread = {x = 5, y = 5, z = 5},
 			seed = 766,
 			octaves = 1,
-			persist = 0.5
+			persist = 0.0
 		},
 	})
 
+	-- Coal
+
 	minetest.register_ore({
 		ore_type       = "scatter",
 		ore            = "default:stone_with_coal",
@@ -122,6 +156,8 @@ function default.register_ores()
 		y_max          = 0,
 	})
 
+	-- Iron
+
 	minetest.register_ore({
 		ore_type       = "scatter",
 		ore            = "default:stone_with_iron",
@@ -166,6 +202,8 @@ function default.register_ores()
 		y_max          = -64,
 	})
 
+	--Mese
+
 	minetest.register_ore({
 		ore_type       = "scatter",
 		ore            = "default:stone_with_mese",
@@ -199,6 +237,8 @@ function default.register_ores()
 		y_max          = -1024,
 	})
 
+	-- Gold
+
 	minetest.register_ore({
 		ore_type       = "scatter",
 		ore            = "default:stone_with_gold",
@@ -221,6 +261,8 @@ function default.register_ores()
 		y_max          = -256,
 	})
 
+	-- Diamond
+
 	minetest.register_ore({
 		ore_type       = "scatter",
 		ore            = "default:stone_with_diamond",
@@ -243,6 +285,8 @@ function default.register_ores()
 		y_max          = -256,
 	})
 
+	-- Copper
+
 	minetest.register_ore({
 		ore_type       = "scatter",
 		ore            = "default:stone_with_copper",
@@ -271,12 +315,15 @@ end
 -- Register biomes
 --
 
+-- All mapgens except mgv6 and singlenode
 
 function default.register_biomes()
 	minetest.clear_registered_biomes()
 
+	-- Temperate
+
 	minetest.register_biome({
-		name = "default:grassland",
+		name = "stone_grassland",
 		--node_dust = "",
 		node_top = "default:dirt_with_grass",
 		depth_top = 1,
@@ -286,25 +333,101 @@ function default.register_biomes()
 		--node_water_top = "",
 		--depth_water_top = ,
 		--node_water = "",
-		y_min = 5,
+		--node_river_water = "",
+		y_min = 50,
 		y_max = 31000,
-		heat_point = 50,
-		humidity_point = 50,
+		heat_point = 40,
+		humidity_point = 35,
 	})
 
 	minetest.register_biome({
-		name = "default:grassland_ocean",
+		name = "coniferous_forest",
 		--node_dust = "",
-		node_top = "default:sand",
+		node_top = "default:dirt_with_grass",
 		depth_top = 1,
-		node_filler = "default:sand",
-		depth_filler = 2,
+		node_filler = "default:dirt",
+		depth_filler = 3,
 		--node_stone = "",
 		--node_water_top = "",
 		--depth_water_top = ,
 		--node_water = "",
+		--node_river_water = "",
+		y_min = 44,
+		y_max = 55,
+		heat_point = 40,
+		humidity_point = 65,
+	})
+
+	minetest.register_biome({
+		name = "coniferous_forest_ocean",
+		--node_dust = "",
+		node_top = "default:sand",
+		depth_top = 1,
+		node_filler = "default:sand",
+		depth_filler = 3,
+		--node_stone = "",
+		--node_water_top = "",
+		--depth_water_top = ,
+		--node_water = "",
+		--node_river_water = "",
+		y_min = -112,
+		y_max = 44,
+		heat_point = 40,
+		humidity_point = 65,
+	})
+
+	minetest.register_biome({
+		name = "deciduous_forest",
+		--node_dust = "",
+		node_top = "default:dirt_with_grass",
+		depth_top = 1,
+		node_filler = "default:dirt",
+		depth_filler = 3,
+		--node_stone = "",
+		--node_water_top = "",
+		--depth_water_top = ,
+		--node_water = "",
+		--node_river_water = "",
+		y_min = 44,
+		y_max = 55,
+		heat_point = 60,
+		humidity_point = 65,
+	})
+
+	minetest.register_biome({
+		name = "deciduous_forest_ocean",
+		--node_dust = "",
+		node_top = "default:sand",
+		depth_top = 1,
+		node_filler = "default:sand",
+		depth_filler = 3,
+		--node_stone = "",
+		--node_water_top = "",
+		--depth_water_top = ,
+		--node_water = "",
+		--node_river_water = "",
+		y_min = -112,
+		y_max = 43,
+		heat_point = 60,
+		humidity_point = 65,
+	})
+
+	-- Underground
+
+	minetest.register_biome({
+		name = "underground",
+		--node_dust = "",
+		--node_top = "",
+		--depth_top = ,
+		--node_filler = "",
+		--depth_filler = ,
+		--node_stone = "",
+		--node_water_top = "",
+		--depth_water_top = ,
+		--node_water = "",
+		--node_river_water = "",
 		y_min = -31000,
-		y_max = 4,
+		y_max = -113,
 		heat_point = 50,
 		humidity_point = 50,
 	})
@@ -312,11 +435,39 @@ end
 
 
 --
--- Register mgv6 decorations
+-- Register decorations
 --
 
+-- Mgv6
 
 function default.register_mgv6_decorations()
+	minetest.clear_registered_decorations()
+
+	-- Papyrus
+
+	minetest.register_decoration({
+		deco_type = "simple",
+		place_on = {"default:dirt_with_grass"},
+		sidelen = 16,
+		noise_params = {
+			offset = -0.3,
+			scale = 0.7,
+			spread = {x = 100, y = 100, z = 100},
+			seed = 354,
+			octaves = 3,
+			persist = 0.7
+		},
+		y_min = 1,
+		y_max = 1,
+		decoration = "default:papyrus",
+		height = 2,
+		height_max = 4,
+		spawn_by = "default:water_source",
+		num_spawn_by = 1,
+	})
+
+	-- Cacti
+
 	minetest.register_decoration({
 		deco_type = "simple",
 		place_on = {"default:desert_sand"},
@@ -335,16 +486,485 @@ function default.register_mgv6_decorations()
 		height = 3,
 	        height_max = 4,
 	})
+
+	-- Long grasses
+
+	for length = 1, 5 do
+		minetest.register_decoration({
+			deco_type = "simple",
+			place_on = {"default:dirt_with_grass"},
+			sidelen = 16,
+			noise_params = {
+				offset = 0,
+				scale = 0.007,
+				spread = {x = 100, y = 100, z = 100},
+				seed = 329,
+				octaves = 3,
+				persist = 0.6
+			},
+			y_min = 1,
+			y_max = 30,
+			decoration = "default:grass_"..length,
+		})
+	end
+
+	-- Dry shrubs
+
+	minetest.register_decoration({
+		deco_type = "simple",
+		place_on = {"default:desert_sand", "default:dirt_with_snow"},
+		sidelen = 16,
+		noise_params = {
+			offset = 0,
+			scale = 0.035,
+			spread = {x = 100, y = 100, z = 100},
+			seed = 329,
+			octaves = 3,
+			persist = 0.6
+		},
+		y_min = 1,
+		y_max = 30,
+		decoration = "default:dry_shrub",
+	})
+end
+
+-- All mapgens except mgv6 and singlenode
+
+local function register_grass_decoration(offset, scale, length)
+	minetest.register_decoration({
+		deco_type = "simple",
+		place_on = {"default:dirt_with_grass", "default:sand"},
+		sidelen = 16,
+		noise_params = {
+			offset = offset,
+			scale = scale,
+			spread = {x = 200, y = 200, z = 200},
+			seed = 329,
+			octaves = 3,
+			persist = 0.6
+		},
+		biomes = {"stone_grassland", "sandstone_grassland",
+			"deciduous_forest", "coniferous_forest",
+			"stone_grassland_dunes", "sandstone_grassland_dunes",
+			"coniferous_forest_dunes"},
+		y_min = 1,
+		y_max = 31000,
+		decoration = "default:grass_"..length,
+	})
+end
+
+local MAX_TREE_H = 60
+local MAX_GRASS_H = 63
+
+local function register_dry_grass_decoration(offset, scale, length)
+	minetest.register_decoration({
+		deco_type = "simple",
+		place_on = {"default:dirt_with_dry_grass"},
+		sidelen = 16,
+		noise_params = {
+			offset = offset,
+			scale = scale,
+			spread = {x = 200, y = 200, z = 200},
+			seed = 329,
+			octaves = 3,
+			persist = 0.6
+		},
+		biomes = {"savanna"},
+		y_min = 1,
+		y_max = MAX_GRASS_H,
+		decoration = "default:dry_grass_"..length,
+	})
+end
+
+function default.register_decorations()
+	minetest.clear_registered_decorations()
+
+	-- Apple tree and log
+
+	minetest.register_decoration({
+		deco_type = "schematic",
+		place_on = {"default:dirt_with_grass"},
+		sidelen = 16,
+		noise_params = {
+			offset = 0.04,
+			scale = 0.02,
+			spread = {x = 250, y = 250, z = 250},
+			seed = 2,
+			octaves = 3,
+			persist = 0.66
+		},
+		biomes = {"deciduous_forest"},
+		y_min = 1,
+		y_max = MAX_TREE_H,
+		schematic = minetest.get_modpath("default").."/schematics/apple_tree.mts",
+		flags = "place_center_x, place_center_z",
+	})
+
+	minetest.register_decoration({
+		deco_type = "schematic",
+		place_on = {"default:dirt_with_grass"},
+		sidelen = 16,
+		noise_params = {
+			offset = 0.002,
+			scale = 0.001,
+			spread = {x = 250, y = 250, z = 250},
+			seed = 2,
+			octaves = 3,
+			persist = 0.66
+		},
+		biomes = {"deciduous_forest"},
+		y_min = 1,
+		y_max = MAX_TREE_H,
+		schematic = {
+			size = { x = 3, y = 3, z = 1},
+			data = {
+				{ name = "air", prob = 0 },
+				{ name = "air", prob = 0 },
+				{ name = "air", prob = 0 },
+				{ name = "default:tree", param2 = 12, prob = 191 },
+				{ name = "default:tree", param2 = 12 },
+				{ name = "default:tree", param2 = 12, prob = 127 },
+				{ name = "air", prob = 0 },
+				{ name = "flowers:mushroom_brown", prob = 63 },
+				{ name = "air", prob = 0 },
+			},
+		},
+		flags = "place_center_x",
+		rotation = "random",
+	})
+
+	-- Jungle tree and log
+
+	minetest.register_decoration({
+		deco_type = "schematic",
+		place_on = {"default:dirt_with_grass", "default:dirt"},
+		sidelen = 40,
+		fill_ratio = 0.035,
+		biomes = {"rainforest", "rainforest_swamp"},
+		y_min = 0,
+		y_max = MAX_TREE_H,
+		schematic = minetest.get_modpath("default").."/schematics/jungle_tree.mts",
+		flags = "place_center_x, place_center_z",
+		rotation = "random",
+	})
+
+	-- Taiga and temperate coniferous forest pine tree and log
+
+	minetest.register_decoration({
+		deco_type = "schematic",
+		place_on = {"default:dirt_with_snow", "default:dirt_with_grass"},
+		sidelen = 16,
+		noise_params = {
+			offset = 0.04,
+			scale = 0.02,
+			spread = {x = 250, y = 250, z = 250},
+			seed = 2,
+			octaves = 3,
+			persist = 0.66
+		},
+		biomes = {"taiga", "coniferous_forest"},
+		y_min = 2,
+		y_max = MAX_TREE_H,
+		schematic = minetest.get_modpath("default").."/schematics/pine_tree.mts",
+		flags = "place_center_x, place_center_z",
+	})
+
+	minetest.register_decoration({
+		deco_type = "schematic",
+		place_on = {"default:dirt_with_snow", "default:dirt_with_grass"},
+		sidelen = 80,
+		fill_ratio = 0.003,
+		biomes = {"taiga", "coniferous_forest"},
+		y_min = 1,
+		y_max = MAX_TREE_H,
+		schematic = {
+			size = { x = 3, y = 3, z = 1},
+			data = {
+				{ name = "air", prob = 0 },
+				{ name = "air", prob = 0 },
+				{ name = "air", prob = 0 },
+				{ name = "default:pine_tree", param2 = 12, prob = 191 },
+				{ name = "default:pine_tree", param2 = 12 },
+				{ name = "default:pine_tree", param2 = 12, prob = 127 },
+				{ name = "air", prob = 0 },
+				{ name = "flowers:mushroom_red", prob = 63 },
+				{ name = "air", prob = 0 },
+			},
+		},
+		flags = "place_center_x",
+		rotation = "random",
+	})
+
+	-- Acacia tree and log
+
+	minetest.register_decoration({
+		deco_type = "schematic",
+		place_on = {"default:dirt_with_dry_grass"},
+		sidelen = 16,
+		noise_params = {
+			offset = 0,
+			scale = 0.002,
+			spread = {x = 250, y = 250, z = 250},
+			seed = 2,
+			octaves = 3,
+			persist = 0.66
+		},
+		biomes = {"savanna"},
+		y_min = 1,
+		y_max = MAX_TREE_H,
+		schematic = minetest.get_modpath("default").."/schematics/acacia_tree.mts",
+		flags = "place_center_x, place_center_z",
+		rotation = "random",
+	})
+
+	minetest.register_decoration({
+		deco_type = "schematic",
+		place_on = {"default:dirt_with_dry_grass"},
+		sidelen = 16,
+		noise_params = {
+			offset = 0,
+			scale = 0.001,
+			spread = {x = 250, y = 250, z = 250},
+			seed = 2,
+			octaves = 3,
+			persist = 0.66
+		},
+		biomes = {"savanna"},
+		y_min = 1,
+		y_max = MAX_TREE_H,
+		schematic = {
+			size = { x = 3, y = 2, z = 1},
+			data = {
+				{ name = "air", prob = 0 },
+				{ name = "air", prob = 0 },
+				{ name = "air", prob = 0 },
+				{ name = "default:acacia_tree", param2 = 12, prob = 191 },
+				{ name = "default:acacia_tree", param2 = 12 },
+				{ name = "default:acacia_tree", param2 = 12, prob = 127 },
+			},
+		},
+		flags = "place_center_x",
+		rotation = "random",
+	})
+
+	-- Aspen tree and log
+
+	minetest.register_decoration({
+		deco_type = "schematic",
+		place_on = {"default:dirt_with_grass"},
+		sidelen = 16,
+		noise_params = {
+			offset = 0.0,
+			scale = -0.03,
+			spread = {x = 250, y = 250, z = 250},
+			seed = 2,
+			octaves = 3,
+			persist = 0.66
+		},
+		biomes = {"deciduous_forest"},
+		y_min = 1,
+		y_max = MAX_TREE_H,
+		schematic = minetest.get_modpath("default").."/schematics/aspen_tree.mts",
+		flags = "place_center_x, place_center_z",
+		rotation = "random",
+	})
+
+	minetest.register_decoration({
+		deco_type = "schematic",
+		place_on = {"default:dirt_with_grass"},
+		sidelen = 16,
+		noise_params = {
+			offset = 0.0,
+			scale = -0.0015,
+			spread = {x = 250, y = 250, z = 250},
+			seed = 2,
+			octaves = 3,
+			persist = 0.66
+		},
+		biomes = {"deciduous_forest"},
+		y_min = 1,
+		y_max = MAX_TREE_H,
+		schematic = {
+			size = { x = 3, y = 3, z = 1},
+			data = {
+				{ name = "air", prob = 0 },
+				{ name = "air", prob = 0 },
+				{ name = "air", prob = 0 },
+				{ name = "default:aspen_tree", param2 = 12 },
+				{ name = "default:aspen_tree", param2 = 12 },
+				{ name = "default:aspen_tree", param2 = 12, prob = 127 },
+				{ name = "flowers:mushroom_red", prob = 63 },
+				{ name = "flowers:mushroom_brown", prob = 63 },
+				{ name = "air", prob = 0 },
+			},
+		},
+		flags = "place_center_x",
+		rotation = "random",
+	})
+	-- Large cactus
+
+	minetest.register_decoration({
+		deco_type = "schematic",
+		place_on = {"default:desert_sand"},
+		sidelen = 16,
+		noise_params = {
+			offset = -0.0003,
+			scale = 0.0009,
+			spread = {x = 200, y = 200, z = 200},
+			seed = 230,
+			octaves = 3,
+			persist = 0.6
+		},
+		biomes = {"desert"},
+		y_min = 5,
+		y_max = MAX_TREE_H,
+		schematic = minetest.get_modpath("default").."/schematics/large_cactus.mts",
+		flags = "place_center_x",
+		rotation = "random",
+	})
+
+	-- Cactus
+
+	minetest.register_decoration({
+		deco_type = "simple",
+		place_on = {"default:desert_sand"},
+		sidelen = 16,
+		noise_params = {
+			offset = -0.0003,
+			scale = 0.0009,
+			spread = {x = 200, y = 200, z = 200},
+			seed = 230,
+			octaves = 3,
+			persist = 0.6
+		},
+		biomes = {"desert"},
+		y_min = 5,
+		y_max = MAX_TREE_H,
+		decoration = "default:cactus",
+		height = 2,
+		height_max = 5,
+	})
+
+	-- Papyrus
+
+	minetest.register_decoration({
+		deco_type = "schematic",
+		place_on = {"default:dirt"},
+		sidelen = 16,
+		noise_params = {
+			offset = -0.3,
+			scale = 0.7,
+			spread = {x = 200, y = 200, z = 200},
+			seed = 354,
+			octaves = 3,
+			persist = 0.7
+		},
+		biomes = {"savanna_swamp"},
+		y_min = 0,
+		y_max = 0,
+		schematic = minetest.get_modpath("default").."/schematics/papyrus.mts",
+	})
+
+	-- Grasses
+
+	register_grass_decoration(-0.03,  0.09,  5)
+	register_grass_decoration(-0.015, 0.075, 4)
+	register_grass_decoration(0,      0.06,  3)
+	register_grass_decoration(0.015,  0.045, 2)
+	register_grass_decoration(0.03,   0.03,  1)
+
+	-- Dry grasses
+
+	register_dry_grass_decoration(0.01, 0.05,  5)
+	register_dry_grass_decoration(0.03, 0.03,  4)
+	register_dry_grass_decoration(0.05, 0.01,  3)
+	register_dry_grass_decoration(0.07, -0.01, 2)
+	register_dry_grass_decoration(0.09, -0.03, 1)
+
+	-- Junglegrass
+
+	minetest.register_decoration({
+		deco_type = "simple",
+		place_on = {"default:dirt_with_grass"},
+		sidelen = 80,
+		fill_ratio = 0.1,
+		biomes = {"rainforest"},
+		y_min = 1,
+		y_max = MAX_GRASS_H,
+		decoration = "default:junglegrass",
+	})
+
+	-- Dry shrub
+
+	minetest.register_decoration({
+		deco_type = "simple",
+		place_on = {"default:desert_sand", "default:dirt_with_snow"},
+		sidelen = 16,
+		noise_params = {
+			offset = 0,
+			scale = 0.02,
+			spread = {x = 200, y = 200, z = 200},
+			seed = 329,
+			octaves = 3,
+			persist = 0.6
+		},
+		biomes = {"desert", "tundra"},
+		y_min = 2,
+		y_max = MAX_GRASS_H,
+		decoration = "default:dry_shrub",
+	})
 end
 
 
 --
--- Register decorations
+-- Generate nyan cats
 --
 
+-- All mapgens except singlenode
 
-function default.register_decorations()
+function default.make_nyancat(pos, facedir, length)
+	local tailvec = {x = 0, y = 0, z = 0}
+	if facedir == 0 then
+		tailvec.z = 1
+	elseif facedir == 1 then
+		tailvec.x = 1
+	elseif facedir == 2 then
+		tailvec.z = -1
+	elseif facedir == 3 then
+		tailvec.x = -1
+	else
+		facedir = 0
+		tailvec.z = 1
+	end
+	local p = {x = pos.x, y = pos.y, z = pos.z}
+	minetest.set_node(p, {name = "default:nyancat", param2 = facedir})
+	for i = 1, length do
+		p.x = p.x + tailvec.x
+		p.z = p.z + tailvec.z
+		minetest.set_node(p, {name = "default:nyancat_rainbow", param2 = facedir})
+	end
+end
 
+function default.generate_nyancats(minp, maxp, seed)
+	local height_min = -31000
+	local height_max = -32
+	if maxp.y < height_min or minp.y > height_max then
+		return
+	end
+	local y_min = math.max(minp.y, height_min)
+	local y_max = math.min(maxp.y, height_max)
+	local volume = (maxp.x - minp.x + 1) * (y_max - y_min + 1) * (maxp.z - minp.z + 1)
+	local pr = PseudoRandom(seed + 9324342)
+	local max_num_nyancats = math.floor(volume / (16 * 16 * 16))
+	for i = 1, max_num_nyancats do
+		if pr:next(0, 1000) == 0 then
+			local x0 = pr:next(minp.x, maxp.x)
+			local y0 = pr:next(minp.y, maxp.y)
+			local z0 = pr:next(minp.z, maxp.z)
+			local p0 = {x = x0, y = y0, z = z0}
+			default.make_nyancat(p0, pr:next(0, 3), pr:next(3, 15))
+		end
+	end
 end
 
 
@@ -352,7 +972,6 @@ end
 -- Detect mapgen to select functions
 --
 
-
 -- Mods using singlenode mapgen can call these functions to enable
 -- the use of minetest.generate_ores or minetest.generate_decorations
 
@@ -360,8 +979,10 @@ local mg_params = minetest.get_mapgen_params()
 if mg_params.mgname == "v6" then
 	default.register_ores()
 	default.register_mgv6_decorations()
+	minetest.register_on_generated(default.generate_nyancats)
 elseif mg_params.mgname ~= "singlenode" then
-	default.register_ores()
 	default.register_biomes()
+	default.register_ores()
 	default.register_decorations()
+	minetest.register_on_generated(default.generate_nyancats)
 end