template specialization for param2

mods/MAPGEN/mcl_mapgen_core/api.lua

@@ -148,16 +148,39 @@ end
 local pending_decorations = {}
 local gennotify_map = {}
 function mcl_mapgen_core.register_decoration(def, callback)
-	def = table.copy(def) -- defensive deep copy, needed for water lily
 	if def.gen_callback and not def.name then error("gen_callback requires a named decoration.") end
 	if callback then error("Callbacks have been redesigned.") end
+	-- customize foliage colors
+	if (def._mcl_foliage_palette_index or 0) > 0 then
+		if type(def.schematic) ~= "string" then error("Can currently only be used with file schematics.") end
+		-- Load the schema and apply foliage palette
+		local schem = minetest.read_schematic(def.schematic, {})
+		schem.name = def.schematic -- preserve the file name
+		local cache = {}
+		for _, node in ipairs(schem.data) do
+			local kind = cache[node.name]
+			if kind == nil then
+				local ndef = minetest.registered_nodes[node.name]
+				kind = ndef and (ndef.groups.foliage_palette and "color")
+				             or (ndef.groups.foliage_palette_wallmounted and "colorwallmounted")
+				             or false
+				cache[node.name] = kind
+			end
+			if kind == "color" then
+				node.param2 = def._mcl_foliage_palette_index
+			elseif kind == "colorwallmounted" then
+				node.param2 = def._mcl_foliage_palette_index * 8 + (node.param2 % 8)
+			end
+		end
+		def.schematic = schem
+	end
 	if pending_decorations == nil then
 		minetest.log("warning", "Decoration registered after mapgen core initialization: "..tostring(def.name))
 		minetest.register_decoration(def)
 		if def.gen_callback then
 			def.deco_id = minetest.get_decoration_id(def.name)
 			if not def.deco_id then
-				error("Failed to get the decoration id for "..tostring(key))
+				error("Failed to get the decoration id for "..tostring(def.name))
 			else
 				minetest.set_gen_notify({decoration = true}, {def.deco_id})
 				gennotify_map["decoration#" .. def.deco_id] = def
@@ -177,6 +200,10 @@ local function sort_decorations()
 			local sc = string.split(def.schematic, "/")
 			name = string.format("%s:%04d", sc[#sc], i)
 		end
+		if not name and type(def.schematic) == "table" and def.schematic.name then
+			local sc = string.split(def.schematic.name, "/")
+			name = string.format("%s:%04d", sc[#sc], i)
+		end
 		if not name and type(def.schematic) == "table" and def.schematic.data then
 			name = ""
 			for _, v in ipairs(def.schematic.data) do
@@ -193,18 +220,16 @@ local function sort_decorations()
 	table.sort(keys)
 	for _, key in ipairs(keys) do
 		local def = map[key]
+		if def.name and minetest.get_decoration_id(def.name) then
+			minetest.log("warning", "Decoration ID not unique: "..def.name)
+		end
 		local deco_id = minetest.register_decoration(def)
 		if not deco_id then
-			error("Failed to register decoration"..tostring(key))
+			error("Failed to register decoration "..tostring(def.name).." - name not unique?")
 		end
 		if def.gen_callback then
-			deco_id = minetest.get_decoration_id(def.name)
+			minetest.set_gen_notify({decoration = true}, {deco_id})
-			if not deco_id then
+			gennotify_map["decoration#" .. deco_id] = def
-				error("Failed to get the decoration id for "..tostring(key))
-			else
-				minetest.set_gen_notify({decoration = true}, {deco_id})
-				gennotify_map["decoration#" .. deco_id] = def
-			end
 		end
 	end
 	pending_decorations = nil -- as we will not run again

mods/MAPGEN/mcl_mapgen_core/init.lua

@@ -285,6 +285,7 @@ local function set_water_palette(minp,maxp,data2,area,nodes)
 	local biomemap = minetest.get_mapgen_object("biomemap")
 	if not biomemap then return end
 	local aream = VoxelArea(vector.new(minp.x, 0, minp.z), vector.new(maxp.x, 0, maxp.z))
+	-- FIXME: this relies on the voxelmanip already being written.
 	local nodes = minetest.find_nodes_in_area(minp, maxp, nodes)
 	local lvm_used = false
 	for n=1, #nodes do
@@ -303,6 +304,7 @@ local function set_water_palette(minp,maxp,data2,area,nodes)
 	return lvm_used
 end
 
+--[[
 local function set_seagrass_param2(minp,maxp,data2,area,nodes)
 	local nodes = minetest.find_nodes_in_area(minp, maxp, nodes)
 	local lvm_used = false
@@ -313,6 +315,7 @@ local function set_seagrass_param2(minp,maxp,data2,area,nodes)
 	end
 	return lvm_used
 end
+]]
 
 -- Below the bedrock, generate air/void
 local function world_structure(vm, data, data2, emin, emax, area, minp, maxp, blockseed)
@@ -367,17 +370,19 @@ local function world_structure(vm, data, data2, emin, emax, area, minp, maxp, bl
 	return lvm_used, lvm_used, deco, ores
 end
 
+--[[ replaced with decoration hack to replace grass nodes
 local function block_fixes_grass(vm, data, data2, emin, emax, area, minp, maxp, blockseed)
 	-- Set param2 (=color) of nodes which use the grass colour palette.
 	return minp.y <= mcl_vars.mg_overworld_max and maxp.y >= mcl_vars.mg_overworld_min and
 		set_grass_palette(minp,maxp,data2,area,{"group:grass_palette"})
-end
+end]]
 
+--[[ replaced with schematic specialization per biome
 local function block_fixes_foliage(vm, data, data2, emin, emax, area, minp, maxp, blockseed)
 	-- Set param2 (=color) of nodes which use the foliage colour palette.
 	return minp.y <= mcl_vars.mg_overworld_max and maxp.y >= mcl_vars.mg_overworld_min and
 		set_foliage_palette(minp,maxp,data2,area,{"group:foliage_palette", "group:foliage_palette_wallmounted"})
-end
+end]]
 
 local function block_fixes_water(vm, data, data2, emin, emax, area, minp, maxp, blockseed)
 	-- Set param2 (=color) of nodes which use the water colour palette.
@@ -385,11 +390,13 @@ local function block_fixes_water(vm, data, data2, emin, emax, area, minp, maxp,
 		set_water_palette(minp,maxp,data2,area,{"group:water_palette"})
 end
 
+--[[ no longer necessary, we generate them with param2=3
 local function block_fixes_seagrass(vm, data, data2, emin, emax, area, minp, maxp, blockseed)
 	-- Set param2 of seagrass to 3.
 	return minp.y <= mcl_vars.mg_overworld_max and maxp.y >= mcl_vars.mg_overworld_min and
 		set_seagrass_param2(minp, maxp, data2, area, {"group:seagrass"})
 end
+]]
 
 -- End block fixes:
 local function end_basic(vm, data, data2, emin, emax, area, minp, maxp, blockseed)
@@ -412,10 +419,10 @@ mcl_mapgen_core.register_generator("world_structure", world_structure, nil, 1, t
 mcl_mapgen_core.register_generator("end_fixes", end_basic, nil, 9999, true)
 
 if mg_name ~= "v6" and mg_name ~= "singlenode" then
-	mcl_mapgen_core.register_generator("block_fixes_grass", block_fixes_grass, nil, 9999, true)
+-- replaced with decoration hack: mcl_mapgen_core.register_generator("block_fixes_grass", block_fixes_grass, nil, 9999, true)
-	mcl_mapgen_core.register_generator("block_fixes_foliage", block_fixes_foliage, nil, 9999, true)
+-- replaced with schema specialization: mcl_mapgen_core.register_generator("block_fixes_foliage", block_fixes_foliage, nil, 9999, true)
 	mcl_mapgen_core.register_generator("block_fixes_water", block_fixes_water, nil, 9999, true)
-	mcl_mapgen_core.register_generator("block_fixes_seagrass", block_fixes_seagrass, nil, 9999, true)
+-- replaced with using param2=3 during generation mcl_mapgen_core.register_generator("block_fixes_seagrass", block_fixes_seagrass, nil, 9999, true)
 end
 
 if mg_name == "v6" then
@@ -423,6 +430,7 @@ if mg_name == "v6" then
 end
 
 -- still needed?
+--[[
 minetest.register_lbm({
 	label = "Fix grass palette indexes", -- This LBM fixes any incorrect grass palette indexes.
 	name = "mcl_mapgen_core:fix_grass_palette_indexes",
@@ -435,8 +443,9 @@ minetest.register_lbm({
 			minetest.swap_node(pos, node)
 		end
 	end
-})
+})]]
 
+--[[ FIXME: not yet replaced
 minetest.register_lbm({
 	label = "Fix foliage palette indexes", -- Set correct palette indexes of foliage in old mapblocks.
 	name = "mcl_mapgen_core:fix_foliage_palette_indexes",
@@ -490,8 +499,10 @@ minetest.register_lbm({
 		end
 	end
 })
+]]--
 
---[[ No longer necessary? Ugly?
+-- Can we get rid of this ugly hack?
+--[[
 -- We go outside x and y for where trees are placed next to a biome that has already been generated.
 -- We go above maxp.y because trees can often get placed close to the top of a generated area and folliage may not
 -- be coloured correctly.

mods/MAPGEN/vl_biomes/badlands_wooded.lua

@@ -107,5 +107,6 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_oak_classic.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 4,
 })
 

mods/MAPGEN/vl_biomes/badlands_wooded_mod.lua

@@ -183,5 +183,6 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_oak_classic.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 4,
 })
 

mods/MAPGEN/vl_biomes/bamboojungle.lua

@@ -45,6 +45,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_tree.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 12,
 })
 
 -- Melon

mods/MAPGEN/vl_biomes/bamboojungle_edge.lua

@@ -38,6 +38,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_tree.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 13,
 })
 -- Melon
 mcl_mapgen_core.register_decoration({

mods/MAPGEN/vl_biomes/bamboojungle_modified.lua

@@ -47,6 +47,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_tree_2.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 12,
 })
 mcl_mapgen_core.register_decoration({
 	deco_type = "schematic",
@@ -65,6 +66,7 @@ mcl_mapgen_core.register_decoration({
 	y_max = vl_biomes.overworld_max,
 	schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_bush_oak_leaves.mts",
 	flags = "place_center_x, place_center_z",
+	_mcl_foliage_palette_index = 12,
 })
 -- Melon
 mcl_mapgen_core.register_decoration({

mods/MAPGEN/vl_biomes/bamboojungle_modified_edge.lua

@@ -41,6 +41,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_tree.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 13,
 })
 
 mcl_mapgen_core.register_decoration({
@@ -60,6 +61,7 @@ mcl_mapgen_core.register_decoration({
 	y_max = vl_biomes.overworld_max,
 	schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_bush_oak_leaves.mts",
 	flags = "place_center_x, place_center_z",
+	_mcl_foliage_palette_index = 13,
 })
 
 -- Melon

mods/MAPGEN/vl_biomes/birchforest.lua

@@ -43,6 +43,7 @@ mcl_mapgen_core.register_decoration({
 	y_max = vl_biomes.overworld_max,
 	schematic = mod_mcl_core .. "/schematics/mcl_core_birch.mts",
 	flags = "place_center_x, place_center_z",
+	_mcl_foliage_palette_index = 8,
 })
 mcl_mapgen_core.register_decoration({
 	deco_type = "schematic",
@@ -65,4 +66,5 @@ mcl_mapgen_core.register_decoration({
 	rotation = "random",
 	spawn_by = "group:flower",
 	priority = 1550,
+	_mcl_foliage_palette_index = 8,
 })

mods/MAPGEN/vl_biomes/birchforest_old.lua

@@ -43,6 +43,7 @@ mcl_mapgen_core.register_decoration({
 	y_max = vl_biomes.overworld_max,
 	schematic = mod_mcl_core .. "/schematics/mcl_core_birch_tall.mts",
 	flags = "place_center_x, place_center_z",
+	_mcl_foliage_palette_index = 8,
 })
 
 mcl_mapgen_core.register_decoration({
@@ -66,4 +67,5 @@ mcl_mapgen_core.register_decoration({
 	rotation = "random",
 	spawn_by = "group:flower",
 	priority = 1550,
+	_mcl_foliage_palette_index = 8,
 })

mods/MAPGEN/vl_biomes/dark_forest.lua

@@ -47,6 +47,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_dark_oak.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 7,
 })
 
 local ratio_mushroom = 0.0001

mods/MAPGEN/vl_biomes/deco/flowers.lua

@@ -1,28 +1,62 @@
 -- Large flowers
 local function register_large_flower(name, biomes, seed, offset)
-	mcl_mapgen_core.register_decoration({
+	local ndef = minetest.registered_nodes["mcl_flowers:"..name]
-		deco_type = "schematic",
+	local has_param2 = ndef and ndef.groups.grass_palette
-		schematic = {
+	local tdef = minetest.registered_nodes["mcl_flowers:"..name]
-			size = vector.new(1, 2, 1),
+	local thas_param2 = tdef and tdef.groups.grass_palette
-			data = {
+	if has_param2 then
-				{name = "mcl_flowers:" .. name },
+		for b = 1, #biomes do
-				{name = "mcl_flowers:" .. name .. "_top" },
+			local param2 = minetest.registered_biomes[biomes[b]]._mcl_grass_palette_index
+			local tparam2 = thas_param2 and param2 or nil
+			mcl_mapgen_core.register_decoration({
+				deco_type = "schematic",
+				schematic = {
+					size = vector.new(1, 2, 1),
+					data = {
+						{name = "mcl_flowers:" .. name, param2 = param2 },
+						{name = "mcl_flowers:" .. name .. "_top", param2 = tparam2 },
+					},
+				},
+				place_on = {"group:grass_block_no_snow", "mcl_core:dirt"},
+				sidelen = 16,
+				noise_params = {
+					offset = offset,
+					scale = 0.01,
+					spread = vector.new(300, 300, 300),
+					seed = seed,
+					octaves = 5,
+					persist = 0.62,
+				},
+				y_min = 1,
+				y_max = vl_biomes.overworld_max,
+				biomes = {biomes[b]},
+			})
+		end
+	else
+		mcl_mapgen_core.register_decoration({
+			deco_type = "schematic",
+			schematic = {
+				size = vector.new(1, 2, 1),
+				data = {
+					{name = "mcl_flowers:" .. name },
+					{name = "mcl_flowers:" .. name .. "_top" },
+				},
 			},
-		},
+			place_on = {"group:grass_block_no_snow", "mcl_core:dirt"},
-		place_on = {"group:grass_block_no_snow", "mcl_core:dirt"},
+			sidelen = 16,
-		sidelen = 16,
+			noise_params = {
-		noise_params = {
+				offset = offset,
-			offset = offset,
+				scale = 0.01,
-			scale = 0.01,
+				spread = vector.new(300, 300, 300),
-			spread = vector.new(300, 300, 300),
+				seed = seed,
-			seed = seed,
+				octaves = 5,
-			octaves = 5,
+				persist = 0.62,
-			persist = 0.62,
+			},
-		},
+			y_min = 1,
-		y_min = 1,
+			y_max = vl_biomes.overworld_max,
-		y_max = vl_biomes.overworld_max,
+			biomes = biomes,
-		biomes = biomes,
+		})
-	})
+	end
 end
 
 register_large_flower("rose_bush", {"Forest"}, 9350, -0.008)
@@ -34,23 +68,49 @@ register_large_flower("lilac", {"FlowerForest"}, 10600, 0.003)
 register_large_flower("sunflower", {"SunflowerPlains"}, 2940, 0.01)
 
 local function register_flower(name, biomes, seed, offset)
-	mcl_mapgen_core.register_decoration({
+	local ndef = minetest.registered_nodes["mcl_flowers:"..name]
-		deco_type = "simple",
+	local has_param2 = ndef and ndef.groups.grass_palette
-		place_on = {"group:grass_block_no_snow", "mcl_core:dirt"},
+	if has_param2 then
-		sidelen = 16,
+		for b = 1, #biomes do
-		noise_params = {
+			local param2 = minetest.registered_biomes[biomes[b]]._mcl_grass_palette_index
-			offset = offset,
+			mcl_mapgen_core.register_decoration({
-			scale = 0.006,
+				deco_type = "simple",
-			spread = vector.new(100, 100, 100),
+				place_on = {"group:grass_block_no_snow", "mcl_core:dirt"},
-			seed = seed,
+				sidelen = 16,
-			octaves = 3,
+				noise_params = {
-			persist = 0.6
+					offset = offset,
-		},
+					scale = 0.006,
-		y_min = 1,
+					spread = vector.new(100, 100, 100),
-		y_max = vl_biomes.overworld_max,
+					seed = seed,
-		biomes = biomes,
+					octaves = 3,
-		decoration = "mcl_flowers:" .. name,
+					persist = 0.6
-	})
+				},
+				y_min = 1,
+				y_max = vl_biomes.overworld_max,
+				biomes = {biomes[b]},
+				decoration = "mcl_flowers:" .. name,
+				param2 = param2
+			})
+		end
+	else
+		mcl_mapgen_core.register_decoration({
+			deco_type = "simple",
+			place_on = {"group:grass_block_no_snow", "mcl_core:dirt"},
+			sidelen = 16,
+			noise_params = {
+				offset = offset,
+				scale = 0.006,
+				spread = vector.new(100, 100, 100),
+				seed = seed,
+				octaves = 3,
+				persist = 0.6
+			},
+			y_min = 1,
+			y_max = vl_biomes.overworld_max,
+			biomes = biomes,
+			decoration = "mcl_flowers:" .. name,
+		})
+	end
 end
 
 local flower_biomes1 = {"Plains", "SunflowerPlains", "RoofedForest", "Forest", "BirchForest", "BirchForestM", "Taiga", "ColdTaiga", "Jungle", "JungleM", "JungleEdge", "JungleEdgeM", "Savanna", "SavannaM", "ExtremeHills", "ExtremeHillsM", "ExtremeHills+", "ExtremeHills+_snowtop"}

mods/MAPGEN/vl_biomes/deco/reeds.lua

@@ -1,24 +1,30 @@
 -- Sugar canes
-mcl_mapgen_core.register_decoration({
+for _, biome in ipairs(vl_biomes.overworld_biomes) do
-	deco_type = "simple",
+	mcl_mapgen_core.register_decoration({
-	place_on = {"mcl_core:dirt", "mcl_core:coarse_dirt", "group:grass_block_no_snow", "group:sand", "mcl_core:podzol", "mcl_core:reeds"},
+		deco_type = "simple",
-	sidelen = 16,
+		place_on = {"mcl_core:dirt", "mcl_core:coarse_dirt", "group:grass_block_no_snow", "group:sand", "mcl_core:podzol", "mcl_core:reeds"},
-	noise_params = {
+		sidelen = 16,
-		offset = -0.3,
+		noise_params = {
-		scale = 0.7,
+			offset = -0.3,
-		spread = vector.new(200, 200, 200),
+			scale = 0.7,
-		seed = 2,
+			spread = vector.new(200, 200, 200),
-		octaves = 3,
+			seed = 2,
-		persist = 0.7
+			octaves = 3,
-	},
+			persist = 0.7
-	y_min = 1,
+		},
-	y_max = vl_biomes.overworld_max,
+		y_min = 1,
-	decoration = "mcl_core:reeds",
+		y_max = vl_biomes.overworld_max,
-	height = 1,
+		decoration = "mcl_core:reeds",
-	height_max = 3,
+		height = 1,
-	spawn_by = {"mcl_core:water_source", "group:frosted_ice"}, -- TODO: river water source, too?
+		height_max = 3,
-	num_spawn_by = 1,
+		spawn_by = {"mcl_core:water_source", "mcl_core:river_water_source", "group:frosted_ice"},
-})
+		num_spawn_by = 1,
+		biomes = {biome},
+		param2 = biome._mcl_foliage_palette_index
+	})
+end
+
+-- additional reeds in swamps
 mcl_mapgen_core.register_decoration({
 	deco_type = "simple",
 	place_on = {"mcl_core:dirt", "mcl_core:coarse_dirt", "group:grass_block_no_snow", "group:sand", "mcl_core:podzol", "mcl_core:reeds"},
@@ -39,5 +45,6 @@ mcl_mapgen_core.register_decoration({
 	height_max = 3,
 	spawn_by = {"mcl_core:water_source", "group:frosted_ice"},
 	num_spawn_by = 1,
+	param2 = 5 -- Swampland foliage palette index
 })
 

mods/MAPGEN/vl_biomes/deco/seagrass_kelp.lua

@@ -1,41 +1,30 @@
--- TODO: move to mcl_ocean?
+-- TODO: move to mcl_ocean with a late registration (when biomes are registered)?
-local function register_seagrass_decoration(grasstype, offset, scale, biomes)
+local function register_seagrass_decoration(offset, scale, biomes)
-	local seed, nodes, surfaces, param2, param2_max, y_max
+	local surfaces = {"mcl_core:dirt", "mcl_core:sand", "mcl_core:gravel", "mcl_core:redsand"}
-	if grasstype == "seagrass" then
+	local nodes = {"mcl_ocean:seagrass_dirt", "mcl_ocean:seagrass_sand", "mcl_ocean:seagrass_gravel", "mcl_ocean:seagrass_redsand"}
-		seed = 16
-		surfaces = {"mcl_core:dirt", "mcl_core:sand", "mcl_core:gravel", "mcl_core:redsand"}
-		nodes = {"mcl_ocean:seagrass_dirt", "mcl_ocean:seagrass_sand", "mcl_ocean:seagrass_gravel", "mcl_ocean:seagrass_redsand"}
-		y_max = 0
-	elseif grasstype == "kelp" then
-		seed = 32
-		param2 = 16
-		param2_max = 96
-		surfaces = {"mcl_core:dirt", "mcl_core:sand", "mcl_core:gravel"}
-		nodes = {"mcl_ocean:kelp_dirt", "mcl_ocean:kelp_sand", "mcl_ocean:kelp_gravel"}
-		y_max = -6
-	end
-	local noise = {
-		offset = offset,
-		scale = scale,
-		spread = vector.new(100, 100, 100),
-		seed = seed,
-		octaves = 3,
-		persist = 0.6,
-	}
 
 	for s = 1, #surfaces do
 		mcl_mapgen_core.register_decoration({
+			name = "Seagrass on "..surfaces[s],
 			deco_type = "simple",
 			priority = 1500,
 			place_on = {surfaces[s]},
 			sidelen = 16,
-			noise_params = noise,
+			noise_params = {
+				offset = offset,
+				scale = scale,
+				spread = vector.new(100, 100, 100),
+				seed = 16,
+				octaves = 3,
+				persist = 0.6,
+			},
 			biomes = biomes,
 			y_min = vl_biomes.DEEP_OCEAN_MIN,
-			y_max = y_max,
+			y_max = 0,
 			decoration = nodes[s],
-			param2 = param2,
+			--param2 = 3, -- always use meshoption 3
-			param2_max = param2_max,
+			param2 = 0,
+			param2_max = 3,
 			place_offset_y = -1,
 			flags = "force_placement",
 		})
@@ -44,7 +33,7 @@ end
 
 -- TODO: use temperature classes, rather than hardcoding biome lists here?
 -- Also would allow for more/less seagrass depending on temperature class
-register_seagrass_decoration("seagrass", 0, 0.5, {
+register_seagrass_decoration(0, 0.5, {
 	"ColdTaiga_ocean",
 	"ExtremeHills_ocean",
 	"ExtremeHillsM_ocean",
@@ -116,7 +105,37 @@ register_seagrass_decoration("seagrass", 0, 0.5, {
 	"ExtremeHills_beach",
 })
 
-register_seagrass_decoration("kelp", -0.5, 1, {
+local function register_kelp_decoration(offset, scale, biomes)
+	local surfaces = {"mcl_core:dirt", "mcl_core:sand", "mcl_core:gravel"}
+	local nodes = {"mcl_ocean:kelp_dirt", "mcl_ocean:kelp_sand", "mcl_ocean:kelp_gravel"}
+	for s = 1, #surfaces do
+		mcl_mapgen_core.register_decoration({
+			name = "Kelp on "..surfaces[s],
+			deco_type = "simple",
+			priority = 1500,
+			place_on = {surfaces[s]},
+			sidelen = 16,
+			noise_params = {
+				offset = offset,
+				scale = scale,
+				spread = vector.new(100, 100, 100),
+				seed = 32,
+				octaves = 3,
+				persist = 0.6,
+			},
+			biomes = biomes,
+			y_min = vl_biomes.DEEP_OCEAN_MIN,
+			y_max = -6,
+			decoration = nodes[s],
+			param2 = 16,
+			param2_max = 96, -- height * 16
+			place_offset_y = -1,
+			flags = "force_placement",
+		})
+	end
+end
+
+register_kelp_decoration(-0.5, 1, {
 	"ExtremeHillsM_ocean",
 	"ExtremeHills+_ocean",
 	"MegaTaiga_ocean",

mods/MAPGEN/vl_biomes/forest.lua

@@ -55,6 +55,7 @@ for i = 1, 4 do
 		schematic = mod_mcl_core .. "/schematics/mcl_core_oak_large_"..i..".mts",
 		flags = "place_center_x, place_center_z",
 		rotation = "random",
+	_mcl_foliage_palette_index = 7,
 	})
 end
 
@@ -77,6 +78,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_oak_classic.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 7,
 })
 
 mcl_mapgen_core.register_decoration({
@@ -100,6 +102,7 @@ mcl_mapgen_core.register_decoration({
 	rotation = "random",
 	spawn_by = "group:flower",
 	priority = 1550,
+	_mcl_foliage_palette_index = 7,
 })
 
 -- Rare balloon oak
@@ -121,6 +124,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_oak_balloon.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 7,
 })
 
 -- Birch
@@ -141,6 +145,7 @@ mcl_mapgen_core.register_decoration({
 	y_max = vl_biomes.overworld_max,
 	schematic = mod_mcl_core .. "/schematics/mcl_core_birch.mts",
 	flags = "place_center_x, place_center_z",
+	_mcl_foliage_palette_index = 7,
 })
 
 mcl_mapgen_core.register_decoration({
@@ -164,5 +169,6 @@ mcl_mapgen_core.register_decoration({
 	rotation = "random",
 	spawn_by = "group:flower",
 	priority = 1550,
+	_mcl_foliage_palette_index = 7,
 })
 

mods/MAPGEN/vl_biomes/forest_flower.lua

@@ -54,6 +54,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_oak_classic.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 7,
 })
 
 mcl_mapgen_core.register_decoration({
@@ -77,6 +78,7 @@ mcl_mapgen_core.register_decoration({
 	rotation = "random",
 	spawn_by = "group:flower",
 	priority = 1550,
+	_mcl_foliage_palette_index = 7,
 })
 
 -- Birch
@@ -97,4 +99,5 @@ mcl_mapgen_core.register_decoration({
 	y_max = vl_biomes.overworld_max,
 	schematic = mod_mcl_core .. "/schematics/mcl_core_birch.mts",
 	flags = "place_center_x, place_center_z",
+	_mcl_foliage_palette_index = 7,
 })

mods/MAPGEN/vl_biomes/init.lua

@@ -34,6 +34,36 @@ local superflat = mg_name == "flat" and minetest.get_mapgen_setting("mcl_superfl
 
 -- Biomes by water temperature, for decorations and structures
 vl_biomes.by_water_temp = {}
+vl_biomes.overworld_biomes = {}
+-- TODO: also add a list of nether and end biomes
+
+-- Fix the grass color via decoration mechanism,
+-- by replacing node_top with node_top and param2 set
+-- TODO: this can be removed when param2 support to biomes is added
+-- <https://github.com/minetest/minetest/issues/15319>
+vl_biomes.fix_grass_color = function(def)
+	if (def._mcl_grass_palette_index or 0) == 0 then return end -- not necessary
+	-- for now, only support node_top.
+	local name = def.node_top
+	local ndef = minetest.registered_nodes[name]
+	if ndef and (ndef.groups.grass_palette or 0) ~= 0 and ndef.paramtype2 == "color" then -- no mixed types
+		local param2 = def._mcl_grass_palette_index
+		mcl_mapgen_core.register_decoration({
+			name = "Set "..name.." param2 in "..def.name,
+			priority = 10, -- run early to not modify other decorations
+			deco_type = "simple",
+			place_on = {name},
+			biomes = { def.name },
+			y_min = def.y_min or vl_biomes.overworld_min,
+			y_max = def.y_max or vl_biomes.overworld_max,
+			fill_ratio = 10, -- everything
+			decoration = name,
+			param2 = param2,
+			flags = "force_placement",
+			place_offset_y = -1, -- replace the node itself
+		})
+	end
+end
 
 -- Register a biome
 -- This API has a few extensions over minetest.register_biome:
@@ -121,10 +151,16 @@ vl_biomes.register_biome = function(def)
 		end
 	end
 	minetest.register_biome(def)
+	if is_overworld and def.y_max > 0 then table.insert(vl_biomes.overworld_biomes, def.name) end
+	vl_biomes.fix_grass_color(def)
 	-- minetest.log("action", "registering biome "..tostring(def.name))
 	for _, sdef in ipairs(subbiomes) do
 		-- minetest.log("action", "registering subbiome "..tostring(sdef.name))
 		minetest.register_biome(sdef)
+		if is_overworld and sdef.y_max > 0 then -- omit _ocean
+			table.insert(vl_biomes.overworld_biomes, sdef.name)
+		end
+		vl_biomes.fix_grass_color(sdef) -- usually a no-op
 	end
 end
 
@@ -148,6 +184,7 @@ function vl_biomes.register_spruce_decoration(seed, offset, sprucename, biomes,
 		y_max = vl_biomes.overworld_max,
 		schematic = mod_mcl_core .. "/schematics/" .. sprucename,
 		flags = "place_center_x, place_center_z",
+		-- not supported by spruceleaves: _mcl_foliage_palette_index = foliage_color,
 	})
 end
 

mods/MAPGEN/vl_biomes/jungle.lua

@@ -47,6 +47,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_oak_classic.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 12,
 })
 
 -- Huge jungle tree (4 variants)
@@ -62,6 +63,7 @@ for i = 1, 4 do
 		schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_tree_huge_"..i..".mts",
 		flags = "place_center_x, place_center_z",
 		rotation = "random",
+		_mcl_foliage_palette_index = 12,
 	})
 end
 
@@ -77,6 +79,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_tree.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 12,
 })
 mcl_mapgen_core.register_decoration({
 	deco_type = "schematic",
@@ -89,6 +92,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_tree_2.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 12,
 })
 mcl_mapgen_core.register_decoration({
 	deco_type = "schematic",
@@ -101,6 +105,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_tree_3.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 12,
 })
 mcl_mapgen_core.register_decoration({
 	deco_type = "schematic",
@@ -113,6 +118,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_tree_4.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 12,
 })
 -- Jungle bush
 mcl_mapgen_core.register_decoration({
@@ -132,6 +138,7 @@ mcl_mapgen_core.register_decoration({
 	y_max = vl_biomes.overworld_max,
 	schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_bush_oak_leaves.mts",
 	flags = "place_center_x, place_center_z",
+	_mcl_foliage_palette_index = 12,
 })
 mcl_mapgen_core.register_decoration({
 	deco_type = "schematic",
@@ -150,6 +157,7 @@ mcl_mapgen_core.register_decoration({
 	y_max = vl_biomes.overworld_max,
 	schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_bush_oak_leaves_2.mts",
 	flags = "place_center_x, place_center_z",
+	_mcl_foliage_palette_index = 12,
 })
 
 -- Melon

mods/MAPGEN/vl_biomes/jungle_edge.lua

@@ -38,6 +38,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_oak_classic.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 13,
 })
 
 mcl_mapgen_core.register_decoration({
@@ -51,6 +52,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_tree.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 13,
 })
 
 mcl_mapgen_core.register_decoration({
@@ -70,6 +72,7 @@ mcl_mapgen_core.register_decoration({
 	y_max = vl_biomes.overworld_max,
 	schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_bush_oak_leaves.mts",
 	flags = "place_center_x, place_center_z",
+	_mcl_foliage_palette_index = 13,
 })
 
 -- Melon

mods/MAPGEN/vl_biomes/jungle_modified.lua

@@ -47,6 +47,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_oak_classic.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 12,
 })
 
 -- Huge jungle tree (4 variants)
@@ -62,6 +63,7 @@ for i = 1, 4 do
 		schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_tree_huge_"..i..".mts",
 		flags = "place_center_x, place_center_z",
 		rotation = "random",
+		_mcl_foliage_palette_index = 12,
 	})
 end
 
@@ -76,6 +78,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_tree_2.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 12,
 })
 mcl_mapgen_core.register_decoration({
 	deco_type = "schematic",
@@ -94,6 +97,7 @@ mcl_mapgen_core.register_decoration({
 	y_max = vl_biomes.overworld_max,
 	schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_bush_oak_leaves.mts",
 	flags = "place_center_x, place_center_z",
+	_mcl_foliage_palette_index = 12,
 })
 -- Melon
 mcl_mapgen_core.register_decoration({

mods/MAPGEN/vl_biomes/jungle_modified_edge.lua

@@ -40,6 +40,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_oak_classic.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 13,
 })
 
 mcl_mapgen_core.register_decoration({
@@ -53,6 +54,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_tree.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 13,
 })
 
 mcl_mapgen_core.register_decoration({
@@ -72,6 +74,7 @@ mcl_mapgen_core.register_decoration({
 	y_max = vl_biomes.overworld_max,
 	schematic = mod_mcl_core .. "/schematics/mcl_core_jungle_bush_oak_leaves.mts",
 	flags = "place_center_x, place_center_z",
+	_mcl_foliage_palette_index = 13,
 })
 
 -- Lots of melons in Jungle Edge M

mods/MAPGEN/vl_biomes/mangroveswamp.lua

@@ -71,6 +71,7 @@ mcl_mapgen_core.register_decoration({
 	flags = "place_center_x, place_center_z, force_placement",
 	rotation = "random",
 	gen_callback = mangrove_root_gennotify,
+	_mcl_foliage_palette_index = 6,
 })
 mcl_mapgen_core.register_decoration({
 	name = "mcl_biomes:mangrove_tree_2",
@@ -85,6 +86,7 @@ mcl_mapgen_core.register_decoration({
 	flags = "place_center_x, place_center_z, force_placement",
 	rotation = "random",
 	gen_callback = mangrove_root_gennotify,
+	_mcl_foliage_palette_index = 6,
 })
 mcl_mapgen_core.register_decoration({
 	name = "mcl_biomes:mangrove_tree_3",
@@ -99,6 +101,7 @@ mcl_mapgen_core.register_decoration({
 	flags = "place_center_x, place_center_z, force_placement",
 	rotation = "random",
 	gen_callback = mangrove_root_gennotify,
+	_mcl_foliage_palette_index = 6,
 })
 mcl_mapgen_core.register_decoration({
 	name = "mcl_biomes:mangrove_tree_4",
@@ -113,6 +116,7 @@ mcl_mapgen_core.register_decoration({
 	flags = "place_center_x, place_center_z, force_placement",
 	rotation = "random",
 	gen_callback = mangrove_root_gennotify,
+	_mcl_foliage_palette_index = 6,
 })
 mcl_mapgen_core.register_decoration({
 	name = "mcl_biomes:mangrove_tree_5",
@@ -127,6 +131,7 @@ mcl_mapgen_core.register_decoration({
 	flags = "place_center_x, place_center_z, force_placement",
 	rotation = "random",
 	gen_callback = mangrove_root_gennotify,
+	_mcl_foliage_palette_index = 6,
 })
 mcl_mapgen_core.register_decoration({
 	name = "mcl_biomes:mangrove_bee_nest",
@@ -151,6 +156,7 @@ mcl_mapgen_core.register_decoration({
 	spawn_by = "group:flower",
 	priority = 1550,
 	gen_callback = mangrove_root_gennotify,
+	_mcl_foliage_palette_index = 6,
 })
 mcl_mapgen_core.register_decoration({
 	deco_type = "simple",

mods/MAPGEN/vl_biomes/savanna.lua

@@ -40,12 +40,13 @@ mcl_mapgen_core.register_decoration({
 	place_on = {"group:grass_block_no_snow", "mcl_core:dirt"},
 	sidelen = 80,
 	fill_ratio = 0.0004,
-	biomes = {"JungleEdge", "JungleEdgeM", "Savanna"},
+	biomes = {"Savanna"},
 	y_min = 1,
 	y_max = vl_biomes.overworld_max,
 	schematic = mod_mcl_core .. "/schematics/mcl_core_oak_classic.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 3,
 })
 -- Acacia (many variants)
 for a = 1, 7 do
@@ -60,6 +61,7 @@ for a = 1, 7 do
 		schematic = mod_mcl_core .. "/schematics/mcl_core_acacia_" .. a .. ".mts",
 		flags = "place_center_x, place_center_z",
 		rotation = "random",
+		_mcl_foliage_palette_index = 3,
 	})
 end
 

mods/MAPGEN/vl_biomes/savanna_windswept.lua

@@ -40,6 +40,7 @@ for a = 1, 7 do
 		schematic = mod_mcl_core .. "/schematics/mcl_core_acacia_" .. a .. ".mts",
 		flags = "place_center_x, place_center_z",
 		rotation = "random",
+		_mcl_foliage_palette_index = 3,
 	})
 end
 

mods/MAPGEN/vl_biomes/snowy_plains.lua

@@ -51,6 +51,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_oak_classic.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 2,
 })
 
 -- Rare spruce in Ice Plains
@@ -71,6 +72,7 @@ mcl_mapgen_core.register_decoration({
 	y_max = vl_biomes.overworld_max,
 	schematic = mod_mcl_core .. "/schematics/mcl_core_spruce_5.mts",
 	flags = "place_center_x, place_center_z",
+	-- not supported by spruce leaves _mcl_foliage_palette_index = 2,
 })
 
 -- Place tall grass on snow in Ice Plains
@@ -93,9 +95,10 @@ mcl_mapgen_core.register_decoration({
 	schematic = {
 		size = vector.new(1, 2, 1),
 		data = {
-			{name = "mcl_core:dirt_with_grass", force_place = true, },
+			{name = "mcl_core:dirt_with_grass", force_place = true, param2 = 10 },
 			{name = "mcl_flowers:tallgrass", param2 = 10},
 		},
 	},
+	place_y_offset = -1,
 })
 

mods/MAPGEN/vl_biomes/snowy_taiga.lua

@@ -74,6 +74,7 @@ mcl_mapgen_core.register_decoration({
 	y_max = vl_biomes.overworld_max,
 	schematic = mod_mcl_core .. "/schematics/mcl_core_spruce_lollipop.mts",
 	flags = "place_center_x, place_center_z",
+	-- not supported by spruce leaves _mcl_foliage_palette_index = 2,
 })
 
 -- Matchstick spruce: Very few leaves, tall trunk
@@ -94,10 +95,10 @@ mcl_mapgen_core.register_decoration({
 	y_max = vl_biomes.overworld_max,
 	schematic = mod_mcl_core .. "/schematics/mcl_core_spruce_matchstick.mts",
 	flags = "place_center_x, place_center_z",
+	-- not supported by spruce leaves _mcl_foliage_palette_index = 2,
 })
 
 vl_biomes.register_spruce_decoration(11000, 0.00150, "mcl_core_spruce_5.mts", {"ColdTaiga"})
-
 vl_biomes.register_spruce_decoration(2500, 0.00325, "mcl_core_spruce_1.mts", {"ColdTaiga"})
 vl_biomes.register_spruce_decoration(7000, 0.00425, "mcl_core_spruce_3.mts", {"ColdTaiga"})
 vl_biomes.register_spruce_decoration(9000, 0.00325, "mcl_core_spruce_4.mts", {"ColdTaiga"})

mods/MAPGEN/vl_biomes/swampland.lua

@@ -54,6 +54,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_oak_swamp.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 5,
 })
 
 -- Lily pad
@@ -75,7 +76,7 @@ for d = 1, lilydepth do
 		deco_type = "schematic",
 		schematic = {
 			size = vector.new(1, height, 1),
-			data = lily_schem,
+			data = table.copy(lily_schem),
 		},
 		place_on = "mcl_core:dirt",
 		sidelen = 16,

mods/MAPGEN/vl_biomes/taiga.lua

@@ -54,6 +54,7 @@ mcl_mapgen_core.register_decoration({
 	y_max = vl_biomes.overworld_max,
 	schematic = mod_mcl_core .. "/schematics/mcl_core_spruce_lollipop.mts",
 	flags = "place_center_x, place_center_z",
+	-- not supported by spruce leaves _mcl_foliage_palette_index = 10,
 })
 
 -- Matchstick spruce: Very few leaves, tall trunk
@@ -74,6 +75,7 @@ mcl_mapgen_core.register_decoration({
 	y_max = vl_biomes.overworld_max,
 	schematic = mod_mcl_core .. "/schematics/mcl_core_spruce_matchstick.mts",
 	flags = "place_center_x, place_center_z",
+	-- not supported by spruce leaves _mcl_foliage_palette_index = 10,
 })
 
 -- Common spruce

mods/MAPGEN/vl_biomes/taiga_old_pine.lua

@@ -88,7 +88,6 @@ vl_biomes.register_spruce_decoration(3000, 0.0008, "mcl_core_spruce_huge_up_1.mt
 vl_biomes.register_spruce_decoration(4000, 0.0008, "mcl_core_spruce_huge_up_2.mts", {"MegaTaiga"})
 vl_biomes.register_spruce_decoration(6000, 0.0008, "mcl_core_spruce_huge_up_3.mts", {"MegaTaiga"})
 
-
 -- Common spruce
 vl_biomes.register_spruce_decoration(2500, 0.00325, "mcl_core_spruce_1.mts", {"MegaTaiga"})
 vl_biomes.register_spruce_decoration(7000, 0.00425, "mcl_core_spruce_3.mts", {"MegaTaiga"})

mods/MAPGEN/vl_biomes/windswepthills.lua

@@ -59,6 +59,7 @@ for i = 1, 4 do
 		schematic = mod_mcl_core .. "/schematics/mcl_core_oak_large_" .. i .. ".mts",
 		flags = "place_center_x, place_center_z",
 		rotation = "random",
+		_mcl_foliage_palette_index = 11,
 	})
 end
 -- Small “classic” oak (many biomes)
@@ -80,6 +81,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_oak_classic.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 11,
 })
 
 -- Spruce
@@ -87,3 +89,4 @@ vl_biomes.register_spruce_decoration(11000, 0.000025, "mcl_core_spruce_5.mts", {
 vl_biomes.register_spruce_decoration(2500, 0.00005, "mcl_core_spruce_1.mts", {"ExtremeHills"})
 vl_biomes.register_spruce_decoration(7000, 0.00005, "mcl_core_spruce_3.mts", {"ExtremeHills"})
 vl_biomes.register_spruce_decoration(9000, 0.00005, "mcl_core_spruce_4.mts", {"ExtremeHills"})
+

mods/MAPGEN/vl_biomes/windswepthills_forest.lua

@@ -58,6 +58,7 @@ for i = 1, 4 do
 		schematic = mod_mcl_core .. "/schematics/mcl_core_oak_large_" .. i .. ".mts",
 		flags = "place_center_x, place_center_z",
 		rotation = "random",
+		_mcl_foliage_palette_index = 11,
 	})
 end
 
@@ -80,6 +81,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_oak_classic.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 11,
 })
 
 mcl_mapgen_core.register_decoration({
@@ -100,6 +102,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_oak_classic.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 11,
 })
 
 -- Spruce
@@ -128,7 +131,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = {
 		size = vector.new(1, 2, 1),
 		data = {
-			{name = "mcl_core:dirt_with_grass", force_place = true, },
+			{name = "mcl_core:dirt_with_grass", force_place = true, param2 = 8 },
 			{name = "mcl_flowers:tallgrass", param2 = 8},
 		},
 	},

mods/MAPGEN/vl_biomes/windswepthills_gravelly.lua

@@ -62,6 +62,7 @@ for i = 1, 4 do
 		schematic = mod_mcl_core .. "/schematics/mcl_core_oak_large_" .. i .. ".mts",
 		flags = "place_center_x, place_center_z",
 		rotation = "random",
+		_mcl_foliage_palette_index = 11,
 	})
 end
 -- Small “classic” oak (many biomes)
@@ -83,6 +84,7 @@ mcl_mapgen_core.register_decoration({
 	schematic = mod_mcl_core .. "/schematics/mcl_core_oak_classic.mts",
 	flags = "place_center_x, place_center_z",
 	rotation = "random",
+	_mcl_foliage_palette_index = 11,
 })
 
 -- Spruce