commit f9df1d732f70a9b5384aac94cb319bdc8a61a336
Author: Till Affeldt <t.affeldt@tu-braunschweig.de>
Date:   Thu Apr 9 09:03:02 2020 +0200

    Sync first working prototype

diff --git a/README.md b/README.md
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+++ b/README.md
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+## Assets
+- Rain sounds CC0 by Q.K., taken from mymonths
+- Thunder sound and puddle texture DWYWPL by Don, Nathan from mymonths at https://github.com/minetest-mods/mymonths
+- Snow cover texture WTFPL, taken from mymonths
+- Rain texture CC-BY-SA 3.0 from TeddyDesTodes, taken from his weather branch at https://github.com/TeddyDesTodes/minetest/tree/weather
+- Snow flake textures CC BY-SA (3.0) by paramat, found in snowdrift mod at https://github.com/paramat/snowdrift
+- Snow texture composited from individual snow flakes by paramat. CC-BY-SA (3.0)
+- Wind sound CC-BY (3.0) by InspectorJ from https://freesound.org/people/InspectorJ/sounds/376415/
\ No newline at end of file
diff --git a/depends.txt b/depends.txt
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+++ b/depends.txt
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+default
+lightning?
+farming?
+flowers?
+bakedclay?
+moreplants?
+lemontree?
+player_monoids?
+playerphysics?
\ No newline at end of file
diff --git a/description.txt b/description.txt
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+++ b/description.txt
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+The ultimate weather mod with support not only for rain, snow, and hail,
+but also seasons, dynamic puddles and snow layers, wind, regrowing fruit and much more.
\ No newline at end of file
diff --git a/init.lua b/init.lua
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--- /dev/null
+++ b/init.lua
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+assert(minetest.add_particlespawner, "Ultimate Weather requires a more current version of Minetest")
+weather_mod = {}
+
+weather_mod.modname = "ultimate_weather"
+weather_mod.modpath = minetest.get_modpath(weather_mod.modname)
+
+local function getBoolSetting(name, default)
+	return minetest.is_yes(minetest.settings:get_bool(weather_mod.modname .. "_" .. name) or default)
+end
+
+local function getNumericSetting(name, default)
+	return tonumber(minetest.settings:get(weather_mod.modname .. "_" .. name) or default)
+end
+
+-- load settings from config file
+weather_mod.settings = {
+	damage			= getBoolSetting("damage", true),
+	weather			= getBoolSetting("weather", true),
+	leaves			= getBoolSetting("leaves", true),
+	snow				= getBoolSetting("snow_layers", true),
+	puddles			= getBoolSetting("puddles", true),
+	skybox			= getBoolSetting("skybox", true),
+	raycasting	= getBoolSetting("raycasting", true),
+	wind				= getBoolSetting("wind", true),
+	flowers			= getBoolSetting("flowers", true),
+	fruit				= getBoolSetting("fruit", true),
+	soil				= getBoolSetting("soil", true),
+	seasons			= getBoolSetting("seasons", true),
+	heat				= getNumericSetting("heat", 0),
+	humidity		= getNumericSetting("humidity", 0),
+	max_height	= getNumericSetting("max_height", 120),
+	min_height	= getNumericSetting("min_height", -50)
+}
+
+weather_mod.state = {
+	current_weather = weather_mod.modname .. ":snowstorm",
+	heat = 1,
+	humidity = 1
+}
+
+-- import core API
+dofile(weather_mod.modpath.."/lib/player.lua")
+dofile(weather_mod.modpath.."/lib/environment.lua")
+dofile(weather_mod.modpath.."/lib/lightning.lua")
+dofile(weather_mod.modpath.."/lib/main.lua")
+
+-- import individual weather types
+dofile(weather_mod.modpath.."/weathers/clear.lua")
+dofile(weather_mod.modpath.."/weathers/rain.lua")
+dofile(weather_mod.modpath.."/weathers/rainstorm.lua")
+dofile(weather_mod.modpath.."/weathers/snow.lua")
+dofile(weather_mod.modpath.."/weathers/snowstorm.lua")
+dofile(weather_mod.modpath.."/weathers/sandstorm.lua")
diff --git a/lib/environment.lua b/lib/environment.lua
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--- /dev/null
+++ b/lib/environment.lua
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+function weather_mod.get_heat(pos)
+	local base = weather_mod.settings.heat;
+	local biome = minetest.get_heat(pos)
+	local height = math.min(math.max(-pos.y / 15, -10), 10)
+	local random = weather_mod.state.heat;
+	return (base + biome + height) * random
+end
+
+function weather_mod.get_humidity(pos)
+	local base = weather_mod.settings.humidity
+	local biome = minetest.get_humidity(pos)
+	local random = weather_mod.state.humidity;
+	return (base + biome) * random
+end
+
+local function is_acceptable_weather_param(value, attr, config)
+	local min = config.conditions["min_" .. attr] or -10000
+	local max = config.conditions["max_" .. attr] or  math.huge
+	minetest.log(attr .. ": " .. value .. " <=> " .. min .. "," .. max)
+	return value > min and value <= max
+end
+
+function weather_mod.get_weather(pos, wind)
+	local params = {}
+	params.heat = weather_mod.get_heat(pos)
+	params.humidity = weather_mod.get_humidity(pos)
+	params.windspeed = vector.length(wind)
+	minetest.log(params.heat .. ", " .. params.humidity .. ", " .. params.windspeed)
+
+	local weather
+	local priority = -1
+	local attributes = { "heat", "humidity", "windspeed" }
+	for name, config in pairs(weather_mod.weathers) do
+		minetest.log(dump2(priority, "p"))
+		if type(priority) ~= "nil" and config.priority < priority then
+			minetest.log("skipped " .. name)
+
+		elseif type(config.conditions) == "nil" then
+			weather = name
+			priority = config.priority
+			minetest.log("selected (nil) " .. name)
+
+		else
+			local check = true
+			for _, attr in ipairs(attributes) do
+				if not is_acceptable_weather_param(params[attr], attr, config) then
+					check = false
+				end
+			end
+			if check then
+				weather = name
+				priority = config.priority
+				minetest.log("selected " .. name)
+			end
+		end
+	end
+	if type(weather) == "nil" then
+		minetest.log("error", "[Ultimate Weather] No default weather registered")
+	end
+	minetest.log(weather)
+	return weather
+end
\ No newline at end of file
diff --git a/lib/lightning.lua b/lib/lightning.lua
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index 0000000..b2c550a
--- /dev/null
+++ b/lib/lightning.lua
@@ -0,0 +1,3 @@
+if minetest.get_modpath("lightning") then
+   lightning.auto = false
+end
\ No newline at end of file
diff --git a/lib/main.lua b/lib/main.lua
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index 0000000..811d5d1
--- /dev/null
+++ b/lib/main.lua
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+local GSCYCLE = 0
+local temperature = 10
+local humidity = 100
+local wind = vector.new(10, 0, -0.25)
+
+weather_mod.weathers = {}
+function weather_mod.register_weather(name, weather)
+	-- TODO: check and sanitize
+	weather_mod.weathers[name] = weather
+end
+
+function weather_mod.set_weather(name)
+	if type(weather_mod.weathers[name]) == nil then
+		minetest.log("warning", "[Ultimate Weathers] Weather does not exist")
+		return
+	end
+	weather_mod.state.current_weather = name
+end
+
+local function is_outside(player, wind)
+	local ppos = player:getpos()
+	local wind_pos = vector.multiply(wind,-1)
+	local skylight_pos = vector.add(ppos, vector.new(0, 40, 0))
+	local downfall_origin = vector.add(skylight_pos,wind_pos)
+	return weather_mod.is_outdoors(player, downfall_origin)
+end
+
+local function get_texture(particles)
+	if type(particles.textures) == "nil" or next(particles.textures) == nil then
+		return particles.texture
+	end
+	return particles.textures[math.random(#particles.textures)]
+end
+
+local function spawn_particles(player, particles, wind)
+	local ppos = player:getpos()
+	local wind_pos = vector.multiply(wind,-1)
+	local wind_speed = vector.length(wind)
+
+	local texture = get_texture(particles)
+
+	local minp = vector.add(vector.add(ppos, particles.min_pos),wind_pos)
+	local maxp = vector.add(vector.add(ppos, particles.max_pos),wind_pos)
+
+	local vel = {x=wind.x,y=-particles.falling_speed,z=wind.z}
+	local acc = {x=0, y=0, z=0}
+
+	local exp = particles.exptime
+	local vertical = wind_speed < 3
+
+	minetest.add_particlespawner({
+		amount=particles.amount,
+		time=0.5,
+		minpos=minp,
+		maxpos=maxp,
+		minvel=vel,
+		maxvel=vel,
+		minacc=acc,
+		maxacc=acc,
+		minexptime=exp,
+		maxexptime=exp,
+		minsize=particles.size,
+		maxsize=particles.size,
+		collisiondetection=true,
+		collision_removal=true,
+		vertical=vertical,
+		texture=texture,
+		player=player:get_player_name()
+	})
+end
+
+local sound_handles = {}
+local function play_sound(player, sound)
+	local playername = player:get_player_name()
+	if not sound_handles[playername] then
+		local handle = minetest.sound_play(sound, {
+			to_player = playername,
+			loop = true
+		})
+		if handle then
+			sound_handles[playername] = handle
+		end
+	end
+end
+
+local function stop_sound(player)
+	local playername = player:get_player_name()
+	if sound_handles[playername] then
+		minetest.sound_stop(sound_handles[playername])
+		sound_handles[playername] = nil
+	end
+end
+
+local function handle_weather()
+	for _, player in ipairs(minetest.get_connected_players()) do
+		local ppos = player:getpos()
+		weather_mod.set_weather(weather_mod.get_weather(ppos, wind))
+
+		if ppos.y < weather_mod.settings.min_height or ppos.y > weather_mod.settings.max_height then
+			return
+		end
+
+		local weather = weather_mod.weathers[weather_mod.state.current_weather]
+		local clouds = weather.clouds
+		clouds.speed = vector.multiply(wind, 2)
+		player:set_clouds(clouds)
+
+		weather_mod.set_headwind(player, wind)
+		--player:set_clouds({ density = 0.6, color = "#a4a0b6e5", speed = wind })
+
+		local outdoors = is_outside(player, wind)
+		if type(weather.particles) ~= "nil" and outdoors then
+			spawn_particles(player, weather.particles, wind)
+		end
+
+		if type(weather.sound) ~= "nil" and outdoors then
+			play_sound(player, weather.sound)
+		else
+			stop_sound(player)
+		end
+	end
+end
+
+local timer = 0
+minetest.register_globalstep(function(dtime)
+	timer = timer + dtime
+	if timer < GSCYCLE then return end
+	timer = 0
+	handle_weather()
+end)
\ No newline at end of file
diff --git a/lib/player.lua b/lib/player.lua
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--- /dev/null
+++ b/lib/player.lua
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+local mod_player_monoids = minetest.get_modpath("player_monoids") ~= nil
+local mod_playerphysics = minetest.get_modpath("playerphysics") ~= nil
+
+function weather_mod.add_physics(player, effect, value)
+	local id = weather_mod.modname .. ":" .. effect
+	if mod_player_monoids then
+		player_monoids[effect].add_change(player, value, id)
+	elseif mod_playerphysics then
+		playerphysics.add_physics_factor(player, effect, id, value)
+	else
+		local override = {}
+		override[effect] = value
+		player:set_physics_override(override)
+	end
+end
+
+function weather_mod.remove_physics(player, effect)
+	local id = weather_mod.modname .. ":" .. effect
+	if mod_player_monoids then
+		player_monoids[effect].del_change(player, id)
+	elseif mod_playerphysics then
+		playerphysics.remove_physics_factor(player, effect, id)
+	else
+		local override = {}
+		override[effect] = 1
+		player:set_physics_override(override)
+	end
+end
+
+-- function taken from weather mod
+-- see https://github.com/theFox6/minetest_mod_weather/blob/master/weather/api.lua#L110
+local function raycast(player, origin)
+	local hitpos = vector.add(player:get_pos(),vector.new(0,1,0))
+	local ray = minetest.raycast(origin,hitpos)
+	local o = ray:next()
+	if not o then return false end
+	if o.type~="object" then return false end -- hit node or something
+	if not o.ref:is_player() then return false end -- hit different object
+	if o.ref:get_player_name() ~= player:get_player_name() then
+		return false --hit other player
+	end
+	o = ray:next()
+	if o then
+		minetest.log("warning","[ultimate_weather] raycast hit more after hitting the player\n"..
+			dump2(o,"o"))
+	end
+	return true
+end
+
+local function check_light(player)
+	return minetest.get_node_light(player:getpos(), 0.5) == 15
+end
+
+function weather_mod.is_outdoors(player, origin)
+	if weather_mod.settings.raycasting then
+		return raycast(player, origin)
+	else
+		return check_light(player)
+	end
+end
+
+function weather_mod.set_headwind(player, wind)
+	local movement = vector.normalize(player:get_player_velocity())
+	local product = vector.dot(movement, wind)
+	-- logistic function, scales between 0 and 2
+	-- see https://en.wikipedia.org/wiki/Logistic_function
+	local L = 2 -- maximum value
+	local k = 0.1 -- growth rate
+	local z = 1 -- midpoint
+	local factor = L / (1 + math.exp(-k * (product - z)))
+	weather_mod.add_physics(player, "speed", factor)
+end
\ No newline at end of file
diff --git a/mod.conf b/mod.conf
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+++ b/mod.conf
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+name = ultimate_weather
+title = Ultimate Weather
+author = TestificateMods
+release = 1
+description = """
+The ultimate weather mod with support not only for rain, snow, and hail,
+but also seasons, dynamic puddles and snow layers, wind, regrowing fruit and much more.
+"""
\ No newline at end of file
diff --git a/settingtypes.txt b/settingtypes.txt
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+++ b/settingtypes.txt
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+ultimate_weather_damage (Storms and hail cause damage) bool true
+ultimate_weather_weather (Enable weather effects) bool true
+ultimate_weather_leaves (Leave color changes in autumn) bool true
+ultimate_weather_snow_layers (Place snow layers on ground) bool true
+ultimate_weather_puddles (Place rain puddles on ground) bool true
+ultimate_weather_skybox (Darken sky during rain) bool true
+ultimate_weather_raycasting (Use performance-heavy indoors check) bool false
+ultimate_weather_wind (Allow wind to angle rainfall) bool true
+ultimate_weather_flowers (Flowers will respawn in spring and die in winter) bool true
+ultimate_weather_fruit (Apples and other fruits will regrow) bool true
+ultimate_weather_soil (Soil turns wet during rain) bool true
+ultimate_weather_seasons (Use seasons instead of permanent summer) bool true
+ultimate_weather_base_temperature (Base temperature) float 0
+ultimate_weather_base_humidity (Base humidity) float 0
+ultimate_weather_max_height (Maximum height of weather effects) int 120
+ultimate_weather_min_height (Minimum height of weather effects) int -50
\ No newline at end of file
diff --git a/sounds/weather_rain1.ogg b/sounds/weather_rain1.ogg
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diff --git a/sounds/weather_rain2.ogg b/sounds/weather_rain2.ogg
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diff --git a/sounds/weather_thunder.ogg b/sounds/weather_thunder.ogg
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diff --git a/sounds/weather_wind.ogg b/sounds/weather_wind.ogg
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diff --git a/textures/weather_hail.png b/textures/weather_hail.png
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diff --git a/textures/weather_puddle.png b/textures/weather_puddle.png
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diff --git a/textures/weather_rain.png b/textures/weather_rain.png
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diff --git a/textures/weather_rain_dark.png b/textures/weather_rain_dark.png
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diff --git a/textures/weather_sand.png b/textures/weather_sand.png
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diff --git a/textures/weather_snow.png b/textures/weather_snow.png
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diff --git a/textures/weather_snow_cover.png b/textures/weather_snow_cover.png
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diff --git a/textures/weather_snowflake1.png b/textures/weather_snowflake1.png
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diff --git a/textures/weather_snowflake2.png b/textures/weather_snowflake2.png
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diff --git a/textures/weather_snowflake4.png b/textures/weather_snowflake4.png
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diff --git a/textures/weather_snowflake6.png b/textures/weather_snowflake6.png
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diff --git a/textures/weather_snowflake7.png b/textures/weather_snowflake7.png
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diff --git a/textures/weather_snowflake8.png b/textures/weather_snowflake8.png
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diff --git a/textures/weather_snowflake9.png b/textures/weather_snowflake9.png
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diff --git a/weathers/clear.lua b/weathers/clear.lua
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index 0000000..3766597
--- /dev/null
+++ b/weathers/clear.lua
@@ -0,0 +1,12 @@
+local name = weather_mod.modname .. ":clear"
+
+local weather = {
+	priority = 0
+}
+
+weather.clouds = {
+	density = 0.3,
+	color = "#fff0f0c5"
+}
+
+weather_mod.register_weather(name, weather)
diff --git a/weathers/rain.lua b/weathers/rain.lua
new file mode 100644
index 0000000..9341197
--- /dev/null
+++ b/weathers/rain.lua
@@ -0,0 +1,30 @@
+local name = weather_mod.modname .. ":rain"
+
+local weather = {
+	priority = 10,
+	spawn_puddles = true,
+	wetten_farmland = true,
+	sound = "weather_rain1"
+}
+
+weather.particles = {
+	min_pos = {x=-9, y=7, z=-9},
+	max_pos = {x= 9, y=7, z= 9},
+	falling_speed=10,
+	amount=20,
+	exptime=0.8,
+	size=25,
+	texture="weather_rain.png"
+}
+
+weather.clouds = {
+	density = 0.5,
+	color = "#a4a0b6e5"
+}
+
+weather.conditions = {
+	min_heat			= 30,
+	min_humidity	= 40
+}
+
+weather_mod.register_weather(name, weather)
diff --git a/weathers/rainstorm.lua b/weathers/rainstorm.lua
new file mode 100644
index 0000000..207de3e
--- /dev/null
+++ b/weathers/rainstorm.lua
@@ -0,0 +1,33 @@
+local name = weather_mod.modname .. ":rainstorm"
+
+local weather = {
+	priority = 30,
+	damage = true,
+	spawn_puddles = true,
+	wetten_farmland = true,
+	lightning = true,
+	sound = "weather_rain2"
+}
+
+weather.particles = {
+	min_pos = {x=-9, y=7, z=-9},
+	max_pos = {x= 9, y=7, z= 9},
+	falling_speed=10,
+	amount=25,
+	exptime=0.8,
+	size=25,
+	texture="weather_rain.png"
+}
+
+weather.clouds = {
+	density = 0.7,
+	color = "#a4a0b6f5"
+}
+
+weather.conditions = {
+	min_heat				= 30,
+	min_humidity		= 60,
+	min_windspeed		= 5
+}
+
+weather_mod.register_weather(name, weather)
diff --git a/weathers/sandstorm.lua b/weathers/sandstorm.lua
new file mode 100644
index 0000000..6d55153
--- /dev/null
+++ b/weathers/sandstorm.lua
@@ -0,0 +1,30 @@
+local name = weather_mod.modname .. ":sandstorm"
+
+local weather = {
+	priority = 50,
+	damage = true,
+	sound = "weather_wind"
+}
+
+weather.particles = {
+	min_pos = {x=-9, y=-5, z=-9},
+	max_pos = {x= 9, y= 5, z= 9},
+	falling_speed=1,
+	amount=40,
+	exptime=0.8,
+	size=15,
+	texture="weather_sand.png"
+}
+
+weather.clouds = {
+	density = 0.3,
+	color = "#a4a0b685"
+}
+
+weather.conditions = {
+	min_heat				= 50,
+	max_humidity		= 25,
+	min_windspeed		= 6
+}
+
+weather_mod.register_weather(name, weather)
diff --git a/weathers/snow.lua b/weathers/snow.lua
new file mode 100644
index 0000000..ab7a1a8
--- /dev/null
+++ b/weathers/snow.lua
@@ -0,0 +1,32 @@
+local name = weather_mod.modname .. ":snow"
+
+local weather = {
+	priority = 20,
+	spawn_snow = true
+}
+
+weather.particles = {
+	min_pos = {x=-20, y= 3, z=-20},
+	max_pos = {x= 20, y=12, z= 20},
+	falling_speed=1,
+	amount=50,
+	exptime=15,
+	size=1,
+	textures = {}
+}
+
+for i = 1,12,1 do
+	weather.particles.textures[i] = "weather_snowflake" .. i .. ".png"
+end
+
+weather.clouds = {
+	density = 0.5,
+	color = "#a4a0b6e5"
+}
+
+weather.conditions = {
+	max_heat				= 30,
+	min_humidity		= 40
+}
+
+weather_mod.register_weather(name, weather)
diff --git a/weathers/snowstorm.lua b/weathers/snowstorm.lua
new file mode 100644
index 0000000..4357ef7
--- /dev/null
+++ b/weathers/snowstorm.lua
@@ -0,0 +1,36 @@
+local name = weather_mod.modname .. ":snowstorm"
+
+local weather = {
+	priority = 40,
+	damage = true,
+	lightning = true,
+	spawn_snow = true,
+	sound = "weather_wind"
+}
+
+weather.particles = {
+	min_pos = {x=-9, y=-5, z=-9},
+	max_pos = {x= 9, y= 5, z= 9},
+	falling_speed=1.5,
+	amount=70,
+	exptime=6,
+	size=1,
+	textures = {}
+}
+
+for i = 1,12,1 do
+	weather.particles.textures[i] = "weather_snowflake" .. i .. ".png"
+end
+
+weather.clouds = {
+	density = 0.7,
+	color = "#a4a0b6f5"
+}
+
+weather.conditions = {
+	max_heat				= 30,
+	min_humidity		= 60,
+	min_windspeed   = 5
+}
+
+weather_mod.register_weather(name, weather)