-- snowdrift 0.3.0 by paramat
-- For latest stable Minetest and back to 0.4.9 dev after 13/01/14
-- Depends default
-- Licenses: code WTFPL, textures CC BY-SA
-- snowfall heaviness parameter
-- rain off by default
-- snow and rain heavier by default
-- update particle spawn format
-- Parameters
local SCALP = 4 -- Time scale for precipitation in minutes
local PRET = 0.3 -- -1 to 1. Precipitation threshold: 1 none, -1 continuous, -0.3 two thirds the time, 0 half the time, 0.3 one third the time
local PPPCHA = 0.1 -- 0 to 1. Per player processing chance. Controls and randomizes processing load
local SETCHA = 0.1 -- 0 to 1. Snow settling chance
local FLAKES = 1 -- Snowfall heaviness. Try 1 on slower computers
local DROPS = 2 -- Rainfall heaviness. Reduce on slower computers
local SNOW = true -- Snowfall below temperature threshold
local SETTLE = false -- Snow collects on ground within 32 nodes of player
local RAIN = false -- Rain above humidity threshold
local THOVER = false -- Instead use a temperature and humidity system with
-- snow in overlap of cold and humid areas, else rain in humid areas
-- Temperature noise parameters
local SEEDT = 112 -- 112 These are default noise parameters from snow mod by Splizard
local OCTAT = 3 -- 3 use these for snowfall in those snow biomes
local PERST = 0.5 -- 0.5
local SCALT = 150 -- 150
local TET = -0.53 -- -0.53 Temperature threshold for snow. Negative because here this noise is temperature, in snow mod it's coldness
-- Humidity noise parameters
local SEEDH = 72384 -- 72384 These are default noise parameters for mapgen V6 humidity
local OCTAH = 4 -- 4 note these cause rain in deserts
local PERSH = 0.66 -- 0.66
local SCALH = 500 -- 500
local HUT = 0 -- Humidity threshold for rain
-- Stuff
snowdrift = {}
-- Globalstep function
minetest.register_globalstep(function(dtime)
local perlinp = minetest.get_perlin(813, 1, 0.5, SCALP)
if perlinp:get2d({x = os.clock()/60, y = 0}) < PRET then
return
end
for _, player in ipairs(minetest.get_connected_players()) do
if math.random() > PPPCHA or player:getpos().y < -19600 then
return
end
local ppos = player:getpos()
if minetest.get_node_light(ppos, 0.5) ~= 15 then
return
end
local pposx = math.floor(ppos.x)
local pposy = math.floor(ppos.y)
local pposz = math.floor(ppos.z)
local snow = false
local rain = false
local noiset
local noiseh
if SNOW or THOVER then
local perlint = minetest.get_perlin(SEEDT, OCTAT, PERST, SCALT)
noiset = perlint:get2d({x = pposx, y = pposz})
end
if RAIN or THOVER then
local perlinh = minetest.get_perlin(SEEDH, OCTAH, PERSH, SCALH)
noiseh = perlinh:get2d({x = pposx, y = pposz})
end
if THOVER then
if noiset < TET and noiseh > HUT then
snow = true
elseif noiseh > HUT then
rain = true
end
elseif SNOW then
if -noiset < TET then -- negative sign because snow mod noise is 'coldness'
snow = true
elseif RAIN then
if noiseh > HUT then
rain = true
end
end
elseif RAIN then
if noiseh > HUT then
rain = true
end
end
if snow then
for flake = 1, FLAKES do
minetest.add_particle({
pos = {x=pposx-32+math.random(0,63), y=pposy+16, z=pposz-16+math.random(0,63)},
vel = {x=math.random()/5-0.1, y=math.random()/5-1.1, z=math.random()/5-1.1},
acc = {x=math.random()/50-0.01, y=math.random()/50-0.01, z=math.random()/50-0.01},
expirationtime = 32,
size = 2.8,
collisiondetection = false,
vertical = false,
texture = "snowdrift_snowflake1.png",
playername = player:get_player_name(),
})
minetest.add_particle({
pos = {x=pposx-32+math.random(0,63), y=pposy+16, z=pposz-16+math.random(0,63)},
vel = {x=math.random()/5-0.1, y=math.random()/5-1.1, z=math.random()/5-1.1},
acc = {x=math.random()/50-0.01, y=math.random()/50-0.01, z=math.random()/50-0.01},
expirationtime = 32,
size = 2.8,
collisiondetection = false,
vertical = false,
texture = "snowdrift_snowflake2.png",
playername = player:get_player_name(),
})
minetest.add_particle({
pos = {x=pposx-32+math.random(0,63), y=pposy+16, z=pposz-16+math.random(0,63)},
vel = {x=math.random()/5-0.1, y=math.random()/5-1.1, z=math.random()/5-1.1},
acc = {x=math.random()/50-0.01, y=math.random()/50-0.01, z=math.random()/50-0.01},
expirationtime = 32,
size = 2.8,
collisiondetection = false,
vertical = false,
texture = "snowdrift_snowflake3.png",
playername = player:get_player_name(),
})
minetest.add_particle({
pos = {x=pposx-32+math.random(0,63), y=pposy+16, z=pposz-16+math.random(0,63)},
vel = {x=math.random()/5-0.1, y=math.random()/5-1.1, z=math.random()/5-1.1},
acc = {x=math.random()/50-0.01, y=math.random()/50-0.01, z=math.random()/50-0.01},
expirationtime = 32,
size = 2.8,
collisiondetection = false,
vertical = false,
texture = "snowdrift_snowflake4.png",
playername = player:get_player_name(),
})
end
if SETTLE and math.random() < SETCHA then -- settling snow
local sposx = pposx - 32 + math.random(0, 63)
local sposz = pposz - 32 + math.random(0, 63)
if minetest.get_node_light({x=sposx, y=pposy+32, z=sposz}, 0.5) == 15 then -- check under open sky
for y = pposy + 32, pposy - 64, -1 do -- find surface
local nodename = minetest.get_node({x=sposx, y=y, z=sposz}).name
if nodename ~= "air" and nodename ~= "ignore" then
if nodename == "default:desert_sand" -- no snow on these
or nodename == "default:desert_stone"
or nodename == "default:water_source" then
break
else -- check node drawtype
local drawtype = minetest.registered_nodes[nodename].drawtype
if drawtype == "normal"
or drawtype == "glasslike"
or drawtype == "glasslike_framed"
or drawtype == "allfaces"
or drawtype == "allfaces_optional" then
if nodename == "default:dirt_with_grass" then
minetest.add_node({x=sposx, y=y, z=sposz}, {name="default:dirt_with_snow"})
end
minetest.add_node({x=sposx, y=y+1, z=sposz}, {name="default:snow"})
break
elseif drawtype == "plantlike" then -- dirt with snow added under plants
local unodename = minetest.get_node({x=sposx, y=y-1, z=sposz}).name
if unodename == "default:dirt_with_grass" then
minetest.add_node({x=sposx, y=y-1, z=sposz}, {name="default:dirt_with_snow"})
end
break
else
break
end
end
end
end
end
end
end
if rain then
for drop = 1, DROPS do
minetest.add_particle({
pos = {x=pposx-24+math.random(0,48), y=pposy+16, z=pposz-24+math.random(0,48)},
vel = {x=0, y=-8, z=-1},
acc = {x=0, y=0, z=0},
expirationtime = 4,
size = 2.8,
collisiondetection = false,
vertical = false,
texture = "snowdrift_raindrop.png",
playername = player:get_player_name(),
})
end
end
end
end)