Major changes, mapgen_v7 support, better falling snow, config.

.gitignore

@@ -0,0 +1,2 @@
+config.txt
+*~

config.lua

@@ -1,10 +0,0 @@
---This file contains configuration options for snow mod.
-
---Enables falling snow.
-snow.enable_snowfall = true
-
---Enables debuging.
-snow.debug = false
-
---Enables smooth transition of biomes.
-snow.smooth = true

falling_snow.lua

@@ -0,0 +1,165 @@
+
+if snow.enable_snowfall then
+	
+	--Weather for legacy versions of minetest.
+	local save_weather_legacy = function ()
+		local file = io.open(minetest.get_worldpath().."/weather_v6", "w+")
+		file:write(weather_legacy)
+		file:close()
+	end
+
+	local read_weather_legacy = function ()
+		local file = io.open(minetest.get_worldpath().."/weather_v6", "r")
+		if not file then return end
+		local readweather = file:read()
+		file:close()
+		return readweather
+	end
+
+	local weather_legacy = read_weather_legacy()
+
+	if snow.legacy then
+		minetest.register_globalstep(function(dtime)
+			if weather_legacy == "snow" then
+				if math.random(1, 10000) == 1 then
+					weather_legacy = "none"
+					save_weather_legacy()
+				end
+			else
+				if math.random(1, 50000) == 2 then
+					weather_legacy = "snow"
+					save_weather_legacy()
+				end
+			end
+		end)
+	end
+	
+	--Get snow at position.
+	local get_snow = function(pos)
+		if snow.legacy then
+			--Legacy support.
+			if weather_legacy == "snow" then
+				local perlin1 = minetest.env:get_perlin(112,3, 0.5, 150)
+				if perlin1:get2d( {x=pos.x, y=pos.z} ) > 0.53 then
+					return true
+				else
+					return false
+				end
+			else
+				return false
+			end
+		else
+			if minetest.get_heat(pos) <= 0 and minetest.get_humidity(pos) > 65 then
+				return true
+			else
+				return false
+			end
+		end
+	end
+	
+	local addvectors = vector and vector.add
+
+	if snow.legacy then
+		addvectors = function (v1, v2)
+			return {x=v1.x+v2.x, y=v1.y+v2.y, z=v1.z+v2.z}
+		end
+	end
+	
+	--Returns a random position between minp and maxp.
+	local randpos = function (minp, maxp)
+		local x,y,z
+		if minp.x > maxp.x then
+			x = math.random(maxp.x,minp.x) else x = math.random(minp.x,maxp.x) end
+			y = minp.y
+		if minp.z > maxp.z then
+			z = math.random(maxp.z,minp.z) else z = math.random(minp.z,maxp.z) end
+		return {x=x,y=y,z=z}
+	end
+
+	local snow_fall=function (pos, player, animate)
+			local ground_y = nil
+			for y=pos.y+10,pos.y+20,1 do
+				local n = minetest.env:get_node({x=pos.x,y=y,z=pos.z}).name
+				if n ~= "air" and n ~= "ignore" then
+					return
+				end
+			end
+			for y=pos.y+10,pos.y-15,-1 do
+				local n = minetest.env:get_node({x=pos.x,y=y,z=pos.z}).name
+				if n ~= "air" and n ~= "ignore" then
+					ground_y = y
+					break
+				end
+			end
+			if not ground_y then return end
+			pos = {x=pos.x, y=ground_y, z=pos.z}
+			local spos = {x=pos.x, y=ground_y+10, z=pos.z}
+	
+		  
+		  	if get_snow(pos) then
+		  		if animate then
+			  		local minp = addvectors(spos, {x=-9, y=3, z=-9})
+					local maxp = addvectors(spos, {x= 9, y=5, z= 9})
+			  		local vel = {x=0, y=   -0.5, z=0}
+					local acc = {x=0, y=   -0.5, z=0}
+		 		 	minetest.add_particlespawner(3, 0.5,
+							minp, maxp,
+							vel, vel,
+							acc, acc,
+							5, 5,
+							50, 50,
+					false, "weather_snow.png", player:get_player_name())
+				end
+				snow.place(pos, true)
+			end
+	end
+
+	-- Snow
+	minetest.register_globalstep(function(dtime)
+		for _, player in ipairs(minetest.get_connected_players()) do
+			local ppos = player:getpos()
+			
+			local sminp = addvectors(ppos, {x=-20, y=0, z=-20})
+			local smaxp = addvectors(ppos, {x= 20, y=0, z= 20})
+		
+			-- Make sure player is not in a cave/house...
+			if get_snow(ppos) and minetest.env:get_node_light(ppos, 0.5) == 15 then
+
+				local minp = addvectors(ppos, {x=-9, y=3, z=-9})
+				local maxp = addvectors(ppos, {x= 9, y=5, z= 9})
+
+				local minp_deep = addvectors(ppos, {x=-5, y=3.2, z=-5})
+				local maxp_deep = addvectors(ppos, {x= 5, y=1.6, z= 5})
+
+				local vel = {x=0, y=   -0.5, z=0}
+				local acc = {x=0, y=   -0.5, z=0}
+
+				minetest.add_particlespawner(5, 0.5,
+					minp, maxp,
+					vel, vel,
+					acc, acc,
+					5, 5,
+					25, 25,
+					false, "weather_snow.png", player:get_player_name())
+
+				minetest.add_particlespawner(4, 0.5,
+					minp_deep, maxp_deep,
+					vel, vel,
+					acc, acc,
+					4, 4,
+					25, 25,
+					false, "weather_snow.png", player:get_player_name())
+					
+				if math.random(1,5) == 4 then	
+					snow_fall(randpos(sminp, smaxp), player)
+				end
+			else
+			
+				if math.random(1,5) == 4 then	
+					snow_fall(randpos(sminp, smaxp), player, true)
+				end
+			end
+		end
+	end)
+	
+end

init.lua

@@ -17,26 +17,11 @@
    MA 02110-1301, USA.
 ]]--
 
-snow = {}
+dofile(minetest.get_modpath("snow").."/util.lua")
 dofile(minetest.get_modpath("snow").."/mapgen.lua")
-dofile(minetest.get_modpath("snow").."/config.lua")
+dofile(minetest.get_modpath("snow").."/falling_snow.lua")
 
---Replace leaves so snow gets removed on decay.
+local needles = {
-local leaves = {}
-for k,v in pairs(minetest.registered_nodes["default:leaves"]) do
-	leaves[k] = v
-end
-leaves.after_destruct = function(pos, node, digger)
-	pos.y = pos.y + 1
-	local nodename = minetest.env:get_node(pos).name
-	if nodename == "snow:snow" then
-		minetest.env:remove_node(pos)
-	end
-end
-minetest.register_node(":default:leaves", leaves)
-
---Pine leaves.
-minetest.register_node("snow:needles", {
 	description = "Pine Needles",
 	drawtype = "allfaces_optional",
 	visual_scale = 1.3,
@@ -46,11 +31,6 @@ minetest.register_node("snow:needles", {
 	drop = {
 		max_items = 1,
 		items = {
-			{
-				-- player will get xmas tree with 1/50 chance
-				items = {'snow:xmas_tree'},
-				rarity = 50,
-			},
 			{
 				-- player will get sapling with 1/20 chance
 				items = {'snow:sapling_pine'},
@@ -63,16 +43,19 @@ minetest.register_node("snow:needles", {
 			}
 		}
 	},
-	--Remove snow above leaves after decay.
-	after_destruct = function(pos, node, digger)
-		pos.y = pos.y + 1
-		local nodename = minetest.env:get_node(pos).name
-		if nodename == "snow:snow" then
-			minetest.env:remove_node(pos)
-		end
-	end,
 	sounds = default.node_sound_leaves_defaults(),
-})
+}
+
+if snow.christmas_content then
+	needles["drop"]["items"][3] = {
+		-- player will get xmas tree with 1/50 chance
+		items = {'snow:xmas_tree'},
+		rarity = 50,
+	}
+end
+
+--Pine leaves.
+minetest.register_node("snow:needles", needles)
 
 --Decorated Pine leaves.
 minetest.register_node("snow:needles_decorated", {
@@ -101,14 +84,6 @@ minetest.register_node("snow:needles_decorated", {
 			}
 		}
 	},
-	--Remove snow above leaves after decay.
-	after_destruct = function(pos, node, digger)
-		pos.y = pos.y + 1
-		local nodename = minetest.env:get_node(pos).name
-		if nodename == "snow:snow" then
-			minetest.env:remove_node(pos)
-		end
-	end,
 	sounds = default.node_sound_leaves_defaults(),
 })
 
@@ -178,13 +153,13 @@ minetest.register_craft({
 
 --Snowballs
 -------------
-snowball_GRAVITY=9
+local snowball_GRAVITY=9
-snowball_VELOCITY=19
+local snowball_VELOCITY=19
 
 --Shoot snowball.
 local snow_shoot_snowball=function (item, player, pointed_thing)
 	local playerpos=player:getpos()
-	local obj=minetest.env:add_entity({x=playerpos.x,y=playerpos.y+1.5,z=playerpos.z}, "snow:snowball_entity")
+	local obj=minetest.add_entity({x=playerpos.x,y=playerpos.y+1.5,z=playerpos.z}, "snow:snowball_entity")
 	local dir=player:get_look_dir()
 	obj:setvelocity({x=dir.x*snowball_VELOCITY, y=dir.y*snowball_VELOCITY, z=dir.z*snowball_VELOCITY})
 	obj:setacceleration({x=dir.x*-3, y=-snowball_GRAVITY, z=dir.z*-3})
@@ -205,12 +180,12 @@ snow_snowball_ENTITY={
 snow_snowball_ENTITY.on_step = function(self, dtime)
 	self.timer=self.timer+dtime
 	local pos = self.object:getpos()
-	local node = minetest.env:get_node(pos)
+	local node = minetest.get_node(pos)
 
 	--Become item when hitting a node.
 	if self.lastpos.x~=nil then --If there is no lastpos for some reason.
 		if node.name ~= "air" then
-			minetest.env:place_node(self.lastpos,{name="snow:snow"})
+			snow.place(pos)
 			self.object:remove()
 		end
 	end
@@ -226,61 +201,199 @@ minetest.register_craftitem("snow:snowball", {
 	on_use = snow_shoot_snowball,
 })
 
---Snow.
+for i=1,8 do
-minetest.register_node("snow:snow", {
+	local snow_box =
-	description = "Snow",
+	{
-	tiles = {"snow_snow.png"},
+	    type  = "fixed",
-	drawtype = "nodebox",
+	    fixed = {-0.5, -0.5, -0.5, 0.5, -0.5 + i/9., 0.5}
-	sunlight_propagates = true,
+	}
-	paramtype = "light",
+	minetest.register_node("snow:snow"..(tostring(i) ~= "1" and tostring(i) or ""), {
-	param2 = nil,
+	   description = "Snow",
-	--param2 is reserved for what vegetation is hiding inside.
+		tiles = {"snow_snow.png"},
-	--mapgen defines the vegetation.
+		drawtype = "nodebox",
-	--1 = Moss
+		sunlight_propagates = true,
-	groups = {crumbly=3,melts=3},
+		paramtype = "light",
-	buildable_to = true,
+		paramtype2 == "leveled",
-	drop = 'snow:snowball',
+		groups = {crumbly=3,melts=3,falling_node=1,not_in_creative_inventory=1},
-	node_box = {
+		buildable_to = true,
-		type = "fixed",
+		drop = {
-		fixed = {
+			max_items = 2,
-			{-0.5, -0.5, -0.5, 0.5, -0.35, 0.5}
+			items = {
+				{
+					-- player will get sapling with 1/20 chance
+					items = {'snow:moss'},
+					rarity = 20,
+				},
+				{
+					-- player will get leaves only if he get no saplings,
+					-- this is because max_items is 1
+					items = {'snow:snowball'},
+				}
+			}
 		},
-	},
+		leveled = 7*i,
-	selection_box = {
+		drawtype = "nodebox",
-		type = "fixed",
+		node_box = snow_box,
-		fixed = {
+		sounds = default.node_sound_dirt_defaults({
-			{-0.5, -0.5, -0.5, 0.5, -0.35, 0.5}
+			footstep = {name="default_snow_footstep", gain=0.45},
+		}),
+		on_construct = function(pos)
+			pos.y = pos.y - 1
+			if minetest.get_node(pos).name == "default:dirt_with_grass" then
+				minetest.add_node(pos, {name="snow:dirt_with_snow"})
+			end
+		end,
+		after_destruct = function(pos)
+			pos.y = pos.y - 1
+			if minetest.get_node(pos).name == "snow:dirt_with_snow" then
+				minetest.add_node(pos, {name="default:dirt_with_grass"})
+			end
+		end,
+	})
+end
+
+if not snow.legacy then
+	--Snow.
+	minetest.register_node("snow:snow", {
+		description = "Snow",
+		tiles = {"snow_snow.png"},
+		drawtype = "nodebox",
+		sunlight_propagates = true,
+		paramtype = "light",
+		paramtype2 == "leveled",
+		groups = {crumbly=3,melts=3,falling_node=1,not_in_creative_inventory=1},
+		buildable_to = true,
+		drop = {
+			max_items = 2,
+			items = {
+				{
+					-- player will get sapling with 1/20 chance
+					items = {'snow:moss'},
+					rarity = 20,
+				},
+				{
+					-- player will get leaves only if he get no saplings,
+					-- this is because max_items is 1
+					items = {'snow:snowball'},
+				}
+			}
 		},
-	},
+		leveled = 7,
-	sounds = default.node_sound_dirt_defaults({
+		drawtype = "nodebox",
-		footstep = {name="default_gravel_footstep", gain=0.45},
+		node_box = {
-	}),
+			type = "leveled",
-	--Update dirt node underneath snow.
+			fixed = {
-	after_destruct = function(pos, node, digger)
+				{-0.5, -0.5, -0.5,  0.5, -0.5+2/16, 0.5},
-		if node.param2 == 1 then
+			},
-			local n = minetest.env:get_node(pos).name
+		},
-			if  n == "air" or n == "default:water_flowing" or n == "default:water_source" then
+		sounds = default.node_sound_dirt_defaults({
-				minetest.env:add_node(pos,{name="snow:moss",param2=1})
+			footstep = {name="default_snow_footstep", gain=0.45},
+		}),
+		on_construct = function(pos)
+			pos.y = pos.y - 1
+			if minetest.get_node(pos).name == "default:dirt_with_grass" then
+				minetest.add_node(pos, {name="snow:dirt_with_snow"})
+			end
+		end,
+		after_destruct = function(pos)
+			pos.y = pos.y - 1
+			if minetest.get_node(pos).name == "snow:dirt_with_snow" then
+				minetest.add_node(pos, {name="default:dirt_with_grass"})
+			end
+		end,
+	})
+else
+	minetest.add_node_level = function(pos, amount)
+		local node = minetest.get_node(pos)
+		if node.name == "snow:snow" then
+			minetest.add_node(pos,{name="snow:snow2"})
+		elseif node.name:find("snow:snow") and node.name:sub(-1)~="8" then
+			minetest.add_node(pos,{name="snow:snow"..tonumber(node.name:sub(-1))+1})
+		end
+	end
+	minetest.get_node_level = function(pos)
+		local node = minetest.get_node(pos)
+		if node.name == "snow:snow" then
+			return 7
+		elseif node.name:find("snow:snow") and node.name:sub(-1) then
+			return 7*(tonumber(node.name:sub(-1)))
+		end
+	end
+end
+
+function snow.place(pos)
+	local node = minetest.get_node(pos)
+	local drawtype = minetest.registered_nodes[node.name].drawtype
+
+	local bnode = minetest.get_node({x=pos.x,y=pos.y-1,z=pos.z})
+	if node.name:find("snow:snow") and minetest.get_node_level(pos) < 63 then
+		if minetest.get_item_group(bnode.name, "leafdecay") == 0 and snow.is_uneven(pos) ~= true then
+			minetest.add_node_level(pos, 7)
+		end
+	elseif node.name:find("snow:snow") and minetest.get_node_level(pos) == 63 then
+		local p = minetest.find_node_near(pos, 10, "default:dirt_with_grass")
+		if p and minetest.get_node_light(p, 0.5) == 15 then
+			minetest.add_node(p,{name="snow:snow"})
+		else
+			minetest.add_node(pos,{name="snow:snowblock"})
+		end
+	elseif node.name ~= "snow:ice" and node.name ~= "air" then
+		if drawtype == "normal" or drawtype == "allfaces_optional" then
+			minetest.add_node({x=pos.x,y=pos.y+1,z=pos.z}, {name="snow:snow"})
+		elseif drawtype == "plantlike" then
+			pos.y = pos.y - 1
+			if minetest.get_node(pos).name == "default:dirt_with_grass" then
+				minetest.add_node(pos, {name="snow:dirt_with_snow"})
 			end
 		end
-		pos.y = pos.y - 1
+	end
-		local nodename = minetest.env:get_node(pos).name
+end
-		if nodename == "snow:dirt_with_snow" then
+
-			minetest.env:add_node(pos,{name="default:dirt_with_grass"})
+--Checks if the snow level is even at any given pos.
+--Smooth snow
+local smooth_snow = snow.smooth_snow
+snow.is_uneven = function(pos)
+	if smooth_snow then
+		local num = minetest.get_node_level(pos)
+		local get_node = minetest.get_node
+		local add_node = minetest.add_node
+		local found
+		local foundx
+		local foundy
+		for x=-1,1 do
+		for z=-1,1 do
+			local node = get_node({x=pos.x+x,y=pos.y,z=pos.z+z})
+			local bnode = get_node({x=pos.x+x,y=pos.y-1,z=pos.z+z})
+			local drawtype = minetest.registered_nodes[node.name].drawtype
+	
+			if drawtype == "plantlike" then
+				if bnode.name == "default:dirt_with_grass" then
+					add_node({x=pos.x+x,y=pos.y-1,z=pos.z+z}, {name="snow:dirt_with_snow"})
+					return true
+				end
+			end
+			
+			if (not(x == 0 and y == 0)) and node.name == "snow:snow" and minetest.get_node_level({x=pos.x+x,y=pos.y,z=pos.z+z}) < num then
+				found = true
+				foundx = x
+				foundz=z
+			elseif node.name == "air" and bnode.name ~= "air" then
+				if not (bnode.name:find("snow:snow")) then 
+					snow.place({x=pos.x+x,y=pos.y,z=pos.z+z})
+					return true
+				end
+			end
 		end
-	end,
-	on_construct = function(pos, newnode)
-		pos.y = pos.y - 1
-		local nodename = minetest.env:get_node(pos).name
-		if nodename == "default:dirt_with_grass" then
-			minetest.env:remove_node(pos)
-			minetest.env:add_node(pos,{name="snow:dirt_with_snow"})
-		elseif nodename == "air" then
-			pos.y = pos.y + 1
-			minetest.env:remove_node(pos)
 		end
-	end,
+		if found then
-})
+			local node = get_node({x=pos.x+foundx,y=pos.y,z=pos.z+foundz})
+			if snow.is_uneven({x=pos.x+foundx,y=pos.y,z=pos.z+foundz}) ~= true then
+				minetest.add_node_level({x=pos.x+foundx,y=pos.y,z=pos.z+foundz}, 7)
+			end
+			return true
+		end
+	end
+end
 
 --Snow with dirt.
 minetest.register_node("snow:dirt_with_snow", {
@@ -290,80 +403,20 @@ minetest.register_node("snow:dirt_with_snow", {
 	groups = {crumbly=3},
 	drop = 'default:dirt',
 	sounds = default.node_sound_dirt_defaults({
-		footstep = {name="default_grass_footstep", gain=0.4},
+		footstep = {name="default_snow_footstep", gain=0.4},
 	}),
-	--Place snow above this node when placed.
-	after_place_node = function(pos, newnode)
-		pos.y = pos.y + 1
-		local nodename = minetest.env:get_node(pos).name
-		if nodename == "air" then
-			minetest.env:add_node(pos,{name="snow:snow"})
-		end
-	end,
 })
 
---Gets rid of snow when the node underneath is dug.
-local unsnowify = function(pos, node, digger)
-	if node.name == "default:dry_shrub" then
-		pos.y = pos.y - 1
-		local nodename = minetest.env:get_node(pos).name
-		if nodename == "snow:dirt_with_snow" then
-			minetest.env:add_node(pos,{name="default:dirt_with_grass"})
-		end
-		pos.y = pos.y + 1
-	end
-	pos.y = pos.y + 1
-	local nodename = minetest.env:get_node(pos).name
-	if nodename == "snow:snow" then
-		minetest.env:remove_node(pos)
-		local obj=minetest.env:add_entity({x=pos.x,y=pos.y,z=pos.z}, "snow:snowball_entity")
-		obj:setacceleration({x=0, y=-snowball_GRAVITY, z=0})
-	end
-end
-
-minetest.register_on_dignode(unsnowify)
-
 --Snow block.
 minetest.register_node("snow:snow_block", {
 	description = "Snow",
 	tiles = {"snow_snow.png"},
-	--param2 is reserved for what vegetation is hiding inside.
-	--mapgen defines the vegetation.
-	--1 = Moss
-	--2 = Papyrus
-	--3 = Dry shrub
 	is_ground_content = true,
 	groups = {crumbly=3,melts=2,falling_node=1},
 	drop = 'snow:snow_block',
 	sounds = default.node_sound_dirt_defaults({
-		footstep = {name="default_grass_footstep", gain=0.4},
+		footstep = {name="default_snow_footstep", gain=0.4},
 	}),
-	--Update dirt node underneath snow.
-	after_destruct = function(pos, node, digger)
-		if node.param2 == 1 then
-			local n = minetest.env:get_node(pos).name
-			if  n == "air" or n == "default:water_flowing" or n == "default:water_source" then
-				minetest.env:add_node(pos,{name="snow:moss",param2=1})
-			end
-		elseif node.param2 == 2 then
-			local n = minetest.env:get_node(pos).name
-			if  n == "air" or n == "default:water_flowing" or n == "default:water_source" then
-				minetest.env:add_node(pos,{name="default:papyrus"})
-				pos.y = pos.y + 1 
-				local n =  minetest.env:get_node(pos)
-				if n.name == "snow:snow_block" and n.param2 == 2 then
-					minetest.env:remove_node(pos)
-					pos.y = pos.y - 1 
-					minetest.env:add_node(pos,{name="snow:snow_block",param2=2})
-				end
-			end
-		elseif node.param2 == 3 then
-			local n = minetest.env:get_node(pos).name
-			if  n == "air" or n == "default:water_flowing" or n == "default:water_source" then
-				minetest.env:add_node(pos,{name="default:dry_shrub"})
-			end
-		end
-	end,
 })
 
 --Snow brick.
@@ -437,20 +490,20 @@ minetest.register_abm({
     action = function(pos, node, active_object_count, active_object_count_wider)
 		local intensity = minetest.get_item_group(node.name,"melts")
 		if intensity == 1 then
-			minetest.env:add_node(pos,{name="default:water_source"})
+			minetest.add_node(pos,{name="default:water_source"})
 		elseif intensity == 2 then
 			local check_place = function(pos,node)
-				if minetest.env:get_node(pos).name == "air" then
+				if minetest.get_node(pos).name == "air" then
-					minetest.env:place_node(pos,node)
+					minetest.place_node(pos,node)
 				end
 			end
-			minetest.env:add_node(pos,{name="default:water_flowing"})
+			minetest.add_node(pos,{name="default:water_flowing"})
 			check_place({x=pos.x+1,y=pos.y,z=pos.z},{name="default:water_flowing"})
 			check_place({x=pos.x-1,y=pos.y,z=pos.z},{name="default:water_flowing"})
 			check_place({x=pos.x,y=pos.y+1,z=pos.z},{name="default:water_flowing"})
 			check_place({x=pos.x,y=pos.y-1,z=pos.z},{name="default:water_flowing"})
 		elseif intensity == 3 then
-			minetest.env:add_node(pos,{name="default:water_flowing"})
+			minetest.add_node(pos,{name="default:water_flowing"})
 		end
 		nodeupdate(pos)
     end,
@@ -464,7 +517,7 @@ minetest.register_abm({
     interval = 20,
     chance = 4,
     action = function(pos, node, active_object_count, active_object_count_wider)
-		minetest.env:add_node(pos,{name="snow:ice"})
+		minetest.add_node(pos,{name="snow:ice"})
     end,
 })
 
@@ -475,7 +528,7 @@ minetest.register_abm({
     interval = 20,
     chance = 6,
     action = function(pos, node, active_object_count, active_object_count_wider)
-		minetest.env:add_node(pos,{name="default:mossycobble"})
+		minetest.add_node(pos,{name="default:mossycobble"})
     end,
 })
 
@@ -498,93 +551,3 @@ minetest.register_abm({
 		snow.make_pine(pos,false,true)
     end,
 })
-
-if snow.enable_snowfall then
-
-	--Snowing
-	snow_fall=function (pos)
-		local obj=minetest.env:add_entity(pos, "snow:fall_entity")
-		obj:setvelocity({x=0, y=-1, z=0})
-	end
-
-	-- The snowfall Entity
-	snow_fall_ENTITY={
-		physical = true,
-		timer=0,
-		textures = {"snow_snowfall.png"},
-		lastpos={},
-		collisionbox = {0,0,0,0,0,0},
-	}
-
-
-	-- snowfall_entity.on_step()--> called when snow is falling
-	snow_fall_ENTITY.on_step = function(self, dtime)
-		self.timer=self.timer+dtime
-		local pos = self.object:getpos()
-		local node = minetest.env:get_node(pos)
-
-		if self.lastpos and self.object:getvelocity().y == 0 then
-			if minetest.env:get_node({x=self.lastpos.x,z=self.lastpos.z,y=self.lastpos.y}).name == "snow:moss" then
-				minetest.env:add_node({x=self.lastpos.x,z=self.lastpos.z,y=self.lastpos.y},{name="snow:snow",param2=1})
-				self.object:remove()
-				return
-			end
-			minetest.env:place_node(self.lastpos,{name="snow:snow"})
-			self.object:remove()
-		end
-		
-		if self.timer > 120 then
-			self.object:remove()
-		end
-
-		self.lastpos={x=pos.x, y=pos.y, z=pos.z} -- Set lastpos-->Node will be added at last pos outside the node
-	end
-
-	minetest.register_entity("snow:fall_entity", snow_fall_ENTITY)
-
-	--Regenerate Snow
-	minetest.register_abm({
-		nodenames = {"default:dirt_with_grass", "snow:moss"},
-		interval = 50,
-		chance = 150,
-		action = function(pos, node, active_object_count, active_object_count_wider)
-			--Check we are in the right biome
-			local env = minetest.env
-			local perlin1 = env:get_perlin(112,3, 0.5, 150)
-			local test = perlin1:get2d({x=pos.x, y=pos.z})
-			local in_biome = false
-			local smooth = snow.smooth
-			if smooth and (test > 0.73 or (test > 0.43 and math.random(0,29) > (0.73 - test) * 100 )) then
-				in_biome = true
-			elseif not smooth and test > 0.53 then
-				in_biome = true
-			end
-			if in_biome then
-				--Check if block is under cover
-				local ground_y = nil
-				for y=15,0,-1 do
-					if env:get_node({x=pos.x,y=y+pos.y,z=pos.z}).name ~= "air" then
-						ground_y = pos.y+y
-						break
-					end
-				end
-				if ground_y then
-					local n = env:get_node({x=pos.x,y=ground_y,z=pos.z})
-					if (n.name ~= "snow:snow" and n.name ~= "snow:snow_block" and n.name ~= "snow:ice" and n.name ~= "default:water_source" and n.name ~= "default:papyrus") then
-						local obj = minetest.env:get_objects_inside_radius({x=pos.x,y=ground_y+20,z=pos.z}, 15)
-						for i,v in pairs(obj) do
-							e = v:get_luaentity()
-							if e ~= nil and e.name == "snow:fall_entity" then 
-								return
-							end
-						end
-						snow_fall({x=pos.x,y=ground_y+15,z=pos.z})
-						if snow.debug then
-							print("snowfall at x"..pos.x.." y"..pos.z)
-						end
-					end
-				end
-			end
-		end
-	})
-end

mapgen.lua

@@ -1,3 +1,26 @@
+local mgname = ""
+
+--Identify the mapgen.
+if minetest.register_on_mapgen_init then
+	minetest.register_on_mapgen_init(function(MapgenParams)
+		if MapgenParams.mgname then
+			mgname = MapgenParams.mgname
+		else
+			io.write("[MOD] Snow Biomes: WARNING! mapgen could not be identifyed!\n")
+		end
+		if mgname == "v7" then
+			--Load mapgen_v7 compatibility.
+			dofile(minetest.get_modpath("snow").."/mapgen_v7.lua")
+		else
+			--Load mapgen_v6 compatibility.
+			dofile(minetest.get_modpath("snow").."/mapgen_v6.lua")
+		end
+	end)
+else
+	--Fall back to mapgen_v6.
+	dofile(minetest.get_modpath("snow").."/mapgen_v6.lua")
+end
+
 local pine_tree = {
 	axiom="TABff",
 	rules_a="[&T+f+ff+ff+ff+f]GA",
@@ -68,236 +91,3 @@ function snow.make_pine(pos,snow,xmas)
 		try_node({x=pos.x,y=pos.y+7,z=pos.z},{name="snow:snow"})
 	end
 end
-
-
-
---Snow biomes are found at 0.53 and greater perlin noise.
-minetest.register_on_generated(function(minp, maxp, seed)
-if maxp.y >= -10 then
-		local debug = snow.debug
-
-		--Should make things a bit faster.
-		local env = minetest.env
-
-		--Get map specific perlin
-		local perlin1 = env:get_perlin(112,3, 0.5, 150)
-
-		-- Assume X and Z lengths are equal
-		local divlen = 16
-		local divs = (maxp.x-minp.x);
-		local x0 = minp.x
-		local z0 = minp.z
-		local x1 = maxp.x
-		local z1 = maxp.z
-
-		--Speed hack: checks the corners and middle of the chunk for "snow biome".
-		if not ( perlin1:get2d( {x=x0, y=z0} ) > 0.53 ) 					--top left
-		and not ( perlin1:get2d( { x = x0 + ( (x1-x0)/2), y=z0 } ) > 0.53 )--top middle
-		and not (perlin1:get2d({x=x1, y=z1}) > 0.53) 						--bottom right
-		and not (perlin1:get2d({x=x1, y=z0+((z1-z0)/2)}) > 0.53) 			--right middle
-		and not (perlin1:get2d({x=x0, y=z1}) > 0.53)  						--bottom left
-		and not (perlin1:get2d({x=x1, y=z0}) > 0.53)						--top right
-		and not (perlin1:get2d({x=x0+((x1-x0)/2), y=z1}) > 0.53) 			--left middle
-		and not (perlin1:get2d({x=(x1-x0)/2, y=(z1-z0)/2}) > 0.53) 			--middle
-		and not (perlin1:get2d({x=x0, y=z1+((z1-z0)/2)}) > 0.53) then		--bottom middle
-			return
-		end
-
-		--Choose a biome types.
-		local pr = PseudoRandom(seed+57)
-		local biome
-
-		--Land biomes
-		biome = pr:next(1, 5)
-		local snowy = biome == 1 --spawns alot of snow
-		local plain = biome == 2 --spawns not much
-		local alpine = biome == 3 --rocky terrain
-		-- biome == 4 or biome == 5 -- normal biome
-
-		--Water biomes
-		biome2 = pr:next(1, 5)
-		local cool = biome == 1  --only spawns ice on edge of water
-		local icebergs = biome == 2
-		local icesheet = biome == 3
-		local icecave = biome == 4
-		local icehole = biome == 5 --icesheet with holes
-
-		--Misc biome settings.
-		local icy = pr:next(1, 2) == 2   --If enabled spawns ice in sand instead of snow blocks.
-		local mossy = pr:next(1,2) == 1  --Spawns moss in snow.
-		local shrubs = pr:next(1,2) == 1 --Spawns dry shrubs in snow.
-		local pines = pr:next(1,2) == 1 --spawns pines.
-
-		--Debugging function
-		local biomeToString = function(num,num2)
-			local biome, biome2
-			if num == 1 then biome = "snowy"
-			elseif num == 2 then biome = "plain"
-			elseif num == 3 then biome = "alpine"
-			elseif num == 4 or num == 5 then biome = "normal"
-			else biome =  "unknown "..num end
-
-			if num2 == 1 then biome2 = "cool"
-			elseif num2 == 2 then biome2 = "icebergs"
-			elseif num2 == 3 then biome2 = "icesheet"
-			elseif num2 == 4 then biome2 = "icecave"
-			elseif num2 == 5 then biome2 = "icehole"
-			else biome2 =  "unknown "..num end
-
-			return biome, biome2
-		end
-
-		local make_pine = snow.make_pine
-		local smooth = snow.smooth
-
-		--Reseed random.
-		pr = PseudoRandom(seed+68)
-
-		if alpine then
-			local trees = env:find_nodes_in_area(minp, maxp, {"default:leaves","default:tree"})
-			for i,v in pairs(trees) do
-				env:remove_node(v)
-			end
-		end
-
-		--Loop through chunk.
-		for j=0,divs do
-		for i=0,divs do
-
-			local x = x0+i
-			local z = z0+j
-
-				--Check if we are in a "Snow biome"
-                local in_biome = false
-                local test = perlin1:get2d({x=x, y=z})
-                if smooth and (not snowy) and (test > 0.73 or (test > 0.43 and pr:next(0,29) > (0.73 - test) * 100 )) then
-                    in_biome = true
-                elseif (not smooth or snowy) and test > 0.53 then
-					in_biome = true
-                end
-
-                if in_biome then
-
-                if not plain or pr:next(1,12) == 1 then
-
-					 -- Find ground level (0...15)
-					local ground_y = nil
-					for y=maxp.y,minp.y+1,-1 do
-						if env:get_node({x=x,y=y,z=z}).name ~= "air" then
-							ground_y = y
-							break
-						end
-					end
-
-					-- Snowy biome stuff
-					local node = env:get_node({x=x,y=ground_y,z=z})
-
-					if ground_y and (node.name == "default:dirt_with_grass" or node.name == "default:junglegrass") then
-							local veg
-							if mossy and pr:next(1,10) == 1 then veg = 1 end
-							if alpine then
-								--Gets rid of dirt
-								env:add_node({x=x,y=ground_y+1,z=z}, {name="snow:snow",param2=veg})
-								for y=ground_y,-6,-1 do
-									if env:get_node({x=x,y=y,z=z}) and env:get_node({x=x,y=y,z=z}).name == "default:stone" then
-										break
-									else
-										env:add_node({x=x,y=y,z=z},{name="default:stone"})
-									end
-								end
-							elseif (shrubs and pr:next(1,28) == 1) or node.name == "default:junglegrass" then
-								--Spawns dry shrubs.
-								env:add_node({x=x,y=ground_y,z=z}, {name="snow:dirt_with_snow"})
-								if snowy then
-									env:add_node({x=x,y=ground_y+1,z=z}, {name="snow:snow_block", param2=3})
-								else
-									env:add_node({x=x,y=ground_y+1,z=z}, {name="default:dry_shrub"})
-								end
-							elseif pines and pr:next(1,36) == 1 then
-								--Spawns pines.
-								env:add_node({x=x,y=ground_y,z=z}, {name="default:dirt_with_grass"})
-								make_pine({x=x,y=ground_y+1,z=z},true)
-							elseif snowy then
-								--Spawns snow blocks.
-								env:add_node({x=x,y=ground_y+1,z=z}, {name="snow:snow_block"})
-								env:add_node({x=x,y=ground_y+2,z=z}, {name="snow:snow",param2=veg})
-							else
-								--Spawns snow.
-								env:add_node({x=x,y=ground_y,z=z}, {name="snow:dirt_with_snow"})
-								env:add_node({x=x,y=ground_y+1,z=z}, {name="snow:snow",param2=veg})
-							end
-					elseif ground_y and node.name == "default:sand" then
-						--Spawns ice in sand if icy, otherwise spawns snow on top.
-						if not icy then
-							env:add_node({x=x,y=ground_y+1,z=z}, {name="snow:snow"})
-							env:add_node({x=x,y=ground_y,z=z}, {name="snow:snow_block"})
-						else
-							env:add_node({x=x,y=ground_y,z=z}, {name="snow:ice"})
-						end
-					elseif ground_y and env:get_node({x=x,y=ground_y,z=z}).name == "default:leaves" then
-						env:add_node({x=x,y=ground_y+1,z=z}, {name="snow:snow"})
-					elseif ground_y and env:get_node({x=x,y=ground_y,z=z}).name == "default:papyrus" then
-						for i=ground_y, ground_y-4, -1 do
-							if env:get_node({x=x,y=i,z=z}).name == "default:papyrus" then
-								env:add_node({x=x,y=ground_y+1,z=z}, {name="snow:snow"})
-								env:add_node({x=x,y=i,z=z}, {name="snow:snow_block", param2=2})
-							end
-						end
-					elseif ground_y and node.name == "default:water_source" then
-						if not icesheet and not icecave and not icehole then
-							--Coastal ice.
-							local x1 = env:get_node({x=x+1,y=ground_y,z=z}).name
-							local z1 = env:get_node({x=x,y=ground_y,z=z+1}).name
-							local xz1 = env:get_node({x=x+1,y=ground_y,z=z+1}).name
-							local xz2 = env:get_node({x=x-1,y=ground_y,z=z-1}).name
-							local x2 = env:get_node({x=x-1,y=ground_y,z=z}).name
-							local z2 = env:get_node({x=x,y=ground_y,z=z-1}).name
-							local y = env:get_node({x=x,y=ground_y-1,z=z}).name
-							local rand = pr:next(1,4) == 1
-							if
-							((x1  and x1 ~= "default:water_source"  and x1 ~= "snow:ice"  and x1 ~= "air" and x1 ~= "ignore") or ((cool or icebergs) and x1 == "snow:ice"  and rand)) or
-							((z1  and z1 ~= "default:water_source"  and z1 ~= "snow:ice"  and z1 ~= "air" and z1 ~= "ignore") or ((cool or icebergs) and z1 == "snow:ice"  and rand)) or
-							((xz1 and xz1 ~= "default:water_source" and xz1 ~= "snow:ice" and xz1 ~= "air"and xz1 ~= "ignore") or ((cool or icebergs) and xz1 == "snow:ice" and rand)) or
-							((xz2 and xz2 ~= "default:water_source" and xz2 ~= "snow:ice" and xz2 ~= "air"and xz2 ~= "ignore") or ((cool or icebergs) and xz2 == "snow:ice" and rand)) or
-							((x2  and x2 ~= "default:water_source"  and x2 ~= "snow:ice"  and x2 ~= "air" and x2 ~= "ignore") or ((cool or icebergs) and x2 == "snow:ice"  and rand)) or
-							((z2  and z2 ~= "default:water_source"  and z2 ~= "snow:ice"  and z2 ~= "air" and z2 ~= "ignore") or ((cool or icebergs) and z2 == "snow:ice"  and rand)) or
-							(y ~= "default:water_source" and y ~= "snow:ice" and y ~= "air") or (pr:next(1,6) == 1 and icebergs) then
-									env:add_node({x=x,y=ground_y,z=z}, {name="snow:ice"})
-							end
-						else
-							--Icesheets, Broken icesheet, Icecaves
-							if (icehole and pr:next(1,10) > 1) or icecave or icesheet then
-								env:add_node({x=x,y=ground_y,z=z}, {name="snow:ice"})
-							end
-							if icecave then
-								--Gets rid of water underneath ice
-								for y=ground_y-1,-60,-1 do
-									if env:get_node({x=x,y=y,z=z}) and env:get_node({x=x,y=y,z=z}).name ~= "default:water_source" then
-										break
-									else
-										env:remove_node({x=x,y=y,z=z})
-									end
-								end
-							end
-						end
-					--~ elseif ground_y and node.name == "snow:snow" and node.name ~= "snow:ice" then
-						--~ --Abort genaration.
-						--~ local name = env:get_node({x=x,y=ground_y-1,z=z}).name
-						--~ if name ~= "default:leaves" and name ~= "snow:needles" then
-							--~ if debug then
-								--~ print(biomeToString(biome)..": snow found ABORTED!")
-							--~ end
-							--~ return
-						--~ end
-					end
-				end
-			end
-		end
-		end
-		if debug then
-			biome_string,biome2_string = biomeToString(biome,biome2)
-			print(biome_string.." and "..biome2_string..": Snow Biome Genarated near x"..minp.x.." z"..minp.z)
-		end
-end
-end
-)

mapgen_v6.lua

@@ -0,0 +1,234 @@
+--Snow biomes are found at 0.53 and greater perlin noise.
+minetest.register_on_generated(function(minp, maxp, seed)
+	if maxp.y >= -10 and maxp.y > snow.min_height then
+		local debug = snow.debug
+		local min_height = snow.min_height
+
+		--Should make things a bit faster.
+		local env = minetest.env
+
+		--Get map specific perlin
+		local perlin1 = env:get_perlin(112,3, 0.5, 150)
+
+		-- Assume X and Z lengths are equal
+		local divlen = 16
+		local divs = (maxp.x-minp.x);
+		local x0 = minp.x
+		local z0 = minp.z
+		local x1 = maxp.x
+		local z1 = maxp.z
+
+		--Speed hack: checks the corners and middle of the chunk for "snow biome".
+		if not ( perlin1:get2d( {x=x0, y=z0} ) > 0.53 ) 					--top left
+		and not ( perlin1:get2d( { x = x0 + ( (x1-x0)/2), y=z0 } ) > 0.53 )--top middle
+		and not (perlin1:get2d({x=x1, y=z1}) > 0.53) 						--bottom right
+		and not (perlin1:get2d({x=x1, y=z0+((z1-z0)/2)}) > 0.53) 			--right middle
+		and not (perlin1:get2d({x=x0, y=z1}) > 0.53)  						--bottom left
+		and not (perlin1:get2d({x=x1, y=z0}) > 0.53)						--top right
+		and not (perlin1:get2d({x=x0+((x1-x0)/2), y=z1}) > 0.53) 			--left middle
+		and not (perlin1:get2d({x=(x1-x0)/2, y=(z1-z0)/2}) > 0.53) 			--middle
+		and not (perlin1:get2d({x=x0, y=z1+((z1-z0)/2)}) > 0.53) then		--bottom middle
+			return
+		end
+
+		--Choose a biome types.
+		local pr = PseudoRandom(seed+57)
+		local biome
+
+		--Land biomes
+		biome = pr:next(1, 5)
+		local snowy = biome == 1 --spawns alot of snow
+		local plain = biome == 2 --spawns not much
+		local alpine = biome == 3 --rocky terrain
+		-- biome == 4 or biome == 5 -- normal biome
+
+		--Water biomes
+		biome2 = pr:next(1, 5)
+		local cool = biome == 1  --only spawns ice on edge of water
+		local icebergs = biome == 2
+		local icesheet = biome == 3
+		local icecave = biome == 4
+		local icehole = biome == 5 --icesheet with holes
+
+		--Misc biome settings.
+		local icy = pr:next(1, 2) == 2   --If enabled spawns ice in sand instead of snow blocks.
+		local mossy = pr:next(1,2) == 1  --Spawns moss in snow.
+		local shrubs = pr:next(1,2) == 1 --Spawns dry shrubs in snow.
+		local pines = pr:next(1,2) == 1 --spawns pines.
+
+		--Debugging function
+		local biomeToString = function(num,num2)
+			local biome, biome2
+			if num == 1 then biome = "snowy"
+			elseif num == 2 then biome = "plain"
+			elseif num == 3 then biome = "alpine"
+			elseif num == 4 or num == 5 then biome = "normal"
+			else biome =  "unknown "..num end
+
+			if num2 == 1 then biome2 = "cool"
+			elseif num2 == 2 then biome2 = "icebergs"
+			elseif num2 == 3 then biome2 = "icesheet"
+			elseif num2 == 4 then biome2 = "icecave"
+			elseif num2 == 5 then biome2 = "icehole"
+			else biome2 =  "unknown "..num end
+
+			return biome, biome2
+		end
+
+		local make_pine = snow.make_pine
+		local smooth = snow.smooth_biomes
+		local legacy = snow.legacy
+
+		--Reseed random.
+		pr = PseudoRandom(seed+68)
+
+		if alpine then
+			local trees = env:find_nodes_in_area(minp, maxp, {"default:leaves","default:tree"})
+			for i,v in pairs(trees) do
+				env:remove_node(v)
+			end
+		end
+
+		--Loop through chunk.
+		for j=0,divs do
+		for i=0,divs do
+
+			local x = x0+i
+			local z = z0+j
+
+				--Check if we are in a "Snow biome"
+	            local in_biome = false
+	            local test = perlin1:get2d({x=x, y=z})
+	            if smooth and (not snowy) and (test > 0.73 or (test > 0.43 and pr:next(0,29) > (0.73 - test) * 100 )) then
+	                in_biome = true
+	            elseif (not smooth or snowy) and test > 0.53 then
+					in_biome = true
+	            end
+
+	            if in_biome then
+
+	            if not plain or pr:next(1,12) == 1 then
+
+					 -- Find ground level (0...15)
+					local ground_y = nil
+					for y=maxp.y,minp.y+1,-1 do
+						if env:get_node({x=x,y=y,z=z}).name ~= "air" then
+							ground_y = y
+							break
+						end
+					end
+					
+					if ground_y and ground_y > min_height then
+
+						-- Snowy biome stuff
+						local node = env:get_node({x=x,y=ground_y,z=z})
+
+						if ground_y and (node.name == "default:dirt_with_grass" or node.name == "default:junglegrass") then
+								local veg
+								if legacy and mossy and pr:next(1,10) == 1 then veg = 1 end
+								if alpine then
+									--Gets rid of dirt
+									env:add_node({x=x,y=ground_y+1,z=z}, {name="snow:snow", param2=veg})
+									for y=ground_y,-6,-1 do
+										if env:get_node({x=x,y=y,z=z}) and env:get_node({x=x,y=y,z=z}).name == "default:stone" then
+											break
+										else
+											env:add_node({x=x,y=y,z=z},{name="default:stone"})
+										end
+									end
+								elseif (shrubs and pr:next(1,28) == 1) or node.name == "default:junglegrass" then
+									--Spawns dry shrubs.
+									env:add_node({x=x,y=ground_y,z=z}, {name="snow:dirt_with_snow"})
+									if snowy then
+										env:add_node({x=x,y=ground_y+1,z=z}, {name="snow:snow_block"})
+									else
+										env:add_node({x=x,y=ground_y+1,z=z}, {name="default:dry_shrub"})
+									end
+								elseif pines and pr:next(1,36) == 1 then
+									--Spawns pines.
+									env:add_node({x=x,y=ground_y,z=z}, {name="default:dirt_with_grass"})
+									make_pine({x=x,y=ground_y+1,z=z},true)
+								elseif snowy then
+									--Spawns snow blocks.
+									env:add_node({x=x,y=ground_y+1,z=z}, {name="snow:snow_block"})
+									env:add_node({x=x,y=ground_y+2,z=z}, {name="snow:snow", param2=veg})
+								else
+									--Spawns snow.
+									env:add_node({x=x,y=ground_y,z=z}, {name="snow:dirt_with_snow"})
+									env:add_node({x=x,y=ground_y+1,z=z}, {name="snow:snow", param2=veg})
+								end
+						elseif ground_y and node.name == "default:sand" then
+							--Spawns ice in sand if icy, otherwise spawns snow on top.
+							if not icy then
+								env:add_node({x=x,y=ground_y+1,z=z}, {name="snow:snow"})
+								env:add_node({x=x,y=ground_y,z=z}, {name="snow:snow_block"})
+							else
+								env:add_node({x=x,y=ground_y,z=z}, {name="snow:ice"})
+							end
+						elseif ground_y and env:get_node({x=x,y=ground_y,z=z}).name == "default:leaves" then
+							env:add_node({x=x,y=ground_y+1,z=z}, {name="snow:snow"})
+						elseif ground_y and env:get_node({x=x,y=ground_y,z=z}).name == "default:papyrus" then
+							for i=ground_y, ground_y-4, -1 do
+								if env:get_node({x=x,y=i,z=z}).name == "default:papyrus" then
+									env:add_node({x=x,y=ground_y+1,z=z}, {name="snow:snow"})
+									env:add_node({x=x,y=i,z=z}, {name="snow:snow_block", param2=2})
+								end
+							end
+						elseif ground_y and node.name == "default:water_source" then
+							if not icesheet and not icecave and not icehole then
+								--Coastal ice.
+								local x1 = env:get_node({x=x+1,y=ground_y,z=z}).name
+								local z1 = env:get_node({x=x,y=ground_y,z=z+1}).name
+								local xz1 = env:get_node({x=x+1,y=ground_y,z=z+1}).name
+								local xz2 = env:get_node({x=x-1,y=ground_y,z=z-1}).name
+								local x2 = env:get_node({x=x-1,y=ground_y,z=z}).name
+								local z2 = env:get_node({x=x,y=ground_y,z=z-1}).name
+								local y = env:get_node({x=x,y=ground_y-1,z=z}).name
+								local rand = pr:next(1,4) == 1
+								if
+								((x1  and x1 ~= "default:water_source"  and x1 ~= "snow:ice"  and x1 ~= "air" and x1 ~= "ignore") or ((cool or icebergs) and x1 == "snow:ice"  and rand)) or
+								((z1  and z1 ~= "default:water_source"  and z1 ~= "snow:ice"  and z1 ~= "air" and z1 ~= "ignore") or ((cool or icebergs) and z1 == "snow:ice"  and rand)) or
+								((xz1 and xz1 ~= "default:water_source" and xz1 ~= "snow:ice" and xz1 ~= "air"and xz1 ~= "ignore") or ((cool or icebergs) and xz1 == "snow:ice" and rand)) or
+								((xz2 and xz2 ~= "default:water_source" and xz2 ~= "snow:ice" and xz2 ~= "air"and xz2 ~= "ignore") or ((cool or icebergs) and xz2 == "snow:ice" and rand)) or
+								((x2  and x2 ~= "default:water_source"  and x2 ~= "snow:ice"  and x2 ~= "air" and x2 ~= "ignore") or ((cool or icebergs) and x2 == "snow:ice"  and rand)) or
+								((z2  and z2 ~= "default:water_source"  and z2 ~= "snow:ice"  and z2 ~= "air" and z2 ~= "ignore") or ((cool or icebergs) and z2 == "snow:ice"  and rand)) or
+								(y ~= "default:water_source" and y ~= "snow:ice" and y ~= "air") or (pr:next(1,6) == 1 and icebergs) then
+										env:add_node({x=x,y=ground_y,z=z}, {name="snow:ice"})
+								end
+							else
+								--Icesheets, Broken icesheet, Icecaves
+								if (icehole and pr:next(1,10) > 1) or icecave or icesheet then
+									env:add_node({x=x,y=ground_y,z=z}, {name="snow:ice"})
+								end
+								if icecave then
+									--Gets rid of water underneath ice
+									for y=ground_y-1,-60,-1 do
+										if env:get_node({x=x,y=y,z=z}) and env:get_node({x=x,y=y,z=z}).name ~= "default:water_source" then
+											break
+										else
+											env:remove_node({x=x,y=y,z=z})
+										end
+									end
+								end
+							end
+						--~ elseif ground_y and node.name == "snow:snow" and node.name ~= "snow:ice" then
+							--~ --Abort genaration.
+							--~ local name = env:get_node({x=x,y=ground_y-1,z=z}).name
+							--~ if name ~= "default:leaves" and name ~= "snow:needles" then
+								--~ if debug then
+									--~ print(biomeToString(biome)..": snow found ABORTED!")
+								--~ end
+								--~ return
+							--~ end
+						end
+					end
+				end
+			end
+		end
+		end
+		if debug then
+			biome_string,biome2_string = biomeToString(biome,biome2)
+			print(biome_string.." and "..biome2_string..": Snow Biome Genarated near x"..minp.x.." z"..minp.z)
+		end
+	end
+end)

mapgen_v7.lua

@@ -0,0 +1,148 @@
+minetest.register_biome({
+	name           = "snow_biome_default",
+
+	node_top       = "snow:dirt_with_snow",
+	depth_top      = 1,
+	node_filler    = "default:dirt",
+	depth_filler   = 2,
+
+	height_min     = snow.min_height,
+	height_max     = snow.min_height+60,
+	heat_point     = 10.0,
+	humidity_point = 40.0,
+})
+
+minetest.register_biome({
+	name           = "snow_biome_forest",
+
+	node_top       = "snow:dirt_with_snow",
+	depth_top      = 1,
+	node_filler    = "default:dirt",
+	depth_filler   = 2,
+
+	height_min     = snow.min_height,
+	height_max     = snow.min_height+60,
+	heat_point     = 10.0,
+	humidity_point = 55.0,
+})
+
+minetest.register_biome({
+	name           = "snow_biome_lush",
+
+	node_top       = "snow:dirt_with_snow",
+	depth_top      = 1,
+	node_filler    = "default:dirt",
+	depth_filler   = 2,
+
+	height_min     = snow.min_height,
+	height_max     = snow.min_height+60,
+	heat_point     = 10.0,
+	humidity_point = 70.0,
+})
+
+minetest.register_biome({
+	name           = "snow_biome_alpine",
+
+	node_top       = "default:stone",
+	depth_top      = 1,
+	node_filler    = "default:stone",
+
+	height_min     = snow.min_height+60,
+	height_max     = 31000,
+	heat_point     = 10.0,
+	humidity_point = 40.0,
+})
+
+minetest.register_biome({
+	name           = "base_normal",
+	
+	height_min     = 3,
+	height_max     = 40,
+	heat_point     = 40.0,
+	humidity_point = 40.0,
+})
+
+minetest.register_biome({
+	name           = "snow_biome_sand",
+	
+	node_top       = "default:sand",
+	depth_top      = 3,
+	node_filler    = "default:stone",
+	depth_filler   = 0,
+	
+	height_min     = -31000,
+	height_max     = 2,
+	heat_point     = 10.0,
+	humidity_point = 40.0,
+})
+
+
+--Pine tree.
+minetest.register_decoration({
+	deco_type = "schematic",
+	place_on = "snow:dirt_with_snow",
+	sidelen = 16,
+	fill_ratio = 0.005,
+	biomes = {"snow_biome_default"},
+	schematic = minetest.get_modpath("snow").."/schematics/pine.mts",
+	flags = "place_center_x, place_center_z",
+})
+
+minetest.register_decoration({
+	deco_type = "schematic",
+	place_on = "snow:dirt_with_snow",
+	sidelen = 16,
+	fill_ratio = 0.05,
+	biomes = {"snow_biome_forest"},
+	schematic = minetest.get_modpath("snow").."/schematics/pine.mts",
+	flags = "place_center_x, place_center_z",
+})
+
+minetest.register_decoration({
+	deco_type = "schematic",
+	place_on = "snow:dirt_with_snow",
+	sidelen = 16,
+	fill_ratio = 0.1,
+	biomes = {"snow_biome_lush"},
+	schematic = minetest.get_modpath("snow").."/schematics/pine.mts",
+	flags = "place_center_x, place_center_z",
+})
+
+--Dry shrubs.
+minetest.register_decoration({
+	deco_type = "simple",
+	place_on = "snow:dirt_with_snow",
+	sidelen = 16,
+	fill_ratio = 0.005,
+	biomes = {"snow_biome_default"},
+	decoration = "default:dry_shrub",
+})
+
+minetest.register_decoration({
+	deco_type = "simple",
+	place_on = "snow:dirt_with_snow",
+	sidelen = 16,
+	fill_ratio = 0.05,
+	biomes = {"snow_biome_forest", "snow_biome_lush"},
+	decoration = "default:dry_shrub",
+})
+
+--Snow.
+minetest.register_decoration({
+	deco_type = "simple",
+	place_on = "snow:dirt_with_snow",
+	sidelen = 16,
+	fill_ratio = 10,
+	biomes = {"snow_biome_default", "snow_biome_forest", "snow_biome_lush"},
+	decoration = "snow:snow",
+})
+
+minetest.register_decoration({
+	deco_type = "simple",
+	place_on = "default:stone",
+	sidelen = 16,
+	fill_ratio = 10,
+	biomes = {"snow_biome_alpine"},
+	decoration = "snow:snow",
+})
+

util.lua

@@ -0,0 +1,98 @@
+--Global config and function table.
+snow = {
+	legacy = true,
+	enable_snowfall = true,
+	debug = false,
+	smooth_biomes = true,
+	christmas_content = true,
+	smooth_snow = true,
+	min_height = 3,
+}
+
+--Config documentation.
+local doc = {
+	legacy = "Whether you are running a legacy minetest version (auto-detected).",
+	enable_snowfall = "Enables falling snow.",
+	debug = "Enables debug output.",
+	smooth_biomes = "Enables smooth transition of biomes",
+	christmas_content = "Disable this to remove christmas saplings from being found.",
+	smooth_snow = "Disable this to stop snow from being smoothed.",
+	min_height = "The minumum height a snow biome will generate.",
+}
+
+--Manage config.
+--Saves contents of config to file.
+local function saveConfig(path, config, doc)
+	local file = io.open(path,"w")
+	if file then
+		for i,v in pairs(config) do
+			local t = type(v)
+			if t == "string" or t == "number" or t == "boolean" then
+				if doc and doc[i] then
+					file:write("# "..doc[i].."\n")
+				end
+				file:write(i.." = "..tostring(v).."\n")
+			end
+		end
+	end
+end
+--Loads config and returns config values inside table.
+local function loadConfig(path)
+	local config = {}
+	local file = io.open(path,"r")
+  	if file then
+  		io.close(file)
+		for line in io.lines(path) do
+			if line:sub(1,1) ~= "#" then
+				i, v = line:match("^(%S*) = (%S*)")
+				if i and v then
+					if v == "true" then v = true end
+					if v == "false" then v = false end
+					if tonumber(v) then v = tonumber(v) end
+					config[i] = v
+				end
+			end
+		end
+		return config
+	else
+		--Create config file.
+		return nil
+	end
+end
+
+minetest.register_on_shutdown(function() saveConfig(minetest.get_modpath("snow").."/config.txt", snow, doc) end)
+
+local config = loadConfig(minetest.get_modpath("snow").."/config.txt")
+if config then
+	for i,v in pairs(config) do
+		snow[i] = v
+	end
+else
+	saveConfig(minetest.get_modpath("snow").."/config.txt", snow, doc)
+end
+
+for i,v in pairs(snow) do
+	local t = type(v)
+	if t == "string" or t == "number" or t == "boolean" then
+		local v = minetest.setting_get("snow_"..i)
+		if v ~= nil then
+			if v == "true" then v = true end
+			if v == "false" then v = false end
+			if tonumber(v) then v = tonumber(v) end
+			snow[i] = v
+		end
+	end
+end
+
+--AUTO DETECT and/or OVERIDEN values--
+
+--legacy--
+--Detect if we are running the latest minetest.
+if minetest.register_on_mapgen_init and minetest.get_heat and minetest.get_humidity then
+	snow.legacy = false
+else
+	snow.legacy = true
+end
+if config and snow.legacy ~= config.legacy then
+	saveConfig(minetest.get_modpath("snow").."/config.txt", snow, doc)
+end