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Add rain. Remove mgv6 support. Add humidity noise to control rarity o…
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…f precipitation. Use MIT source code licence
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@paramat
paramat committed Apr 13, 2017
1 parent e599566 commit ecf29af
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4 changes: 2 additions & 2 deletions README.txt
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
snowdrift 0.4.0 by paramat
snowdrift 0.5.0 by paramat
For Minetest 0.4.12 and later
Depends default
Licenses: code WTFPL, textures CC BY-SA
Licenses: Source code MIT. Media (textures) CC BY-SA (3.0)
244 changes: 112 additions & 132 deletions init.lua
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@@ -1,18 +1,12 @@
-- Parameters

local PRECSPR = 11 -- Time scale for precipitation variation in minutes
local PRECTHR = -1 -- Precipitation noise threshold:
-- -1 continuous, -0.3 two thirds the time,
-- 0 half the time, 0.3 one third the time, 1 none.
local PROCHA = 0.1 -- Per player per globalstep processing chance
local FLAKES = 32 -- Snowflake density
local NISVAL = 39 -- Snow clouds RGB value at night
local DASVAL = 175 -- Snow clouds RGB value in daytime


-- Stuff

local difsval = DASVAL - NISVAL
local PRECOFF = 0.8 -- Precipitation noise threshold offset
local PROCHA = 0.2 -- Per player per globalstep processing chance
local FLAKES = 8 -- Snowflake density
local DROPS = 16 -- Rainfall density
local NISVAL = 39 -- Clouds RGB value at night
local DASVAL = 175 -- Clouds RGB value in daytime

local np_prec = {
offset = 0,
Expand All @@ -25,77 +19,86 @@ local np_prec = {
--flags = ""
}

local np_temp, tempthr
local mg_params = minetest.get_mapgen_params()
if mg_params.mgname == "v6" then
np_temp = {
offset = 0,
scale = 1,
spread = {x = 500, y = 500, z = 500},
seed = 9130,
octaves = 3,
persist = 0.5,
lacunarity = 2.0,
--flags = ""
}
tempthr = -0.4
else
np_temp = {
offset = 0,
scale = 1,
spread = {x = 1000, y = 1000, z = 1000},
seed = 5349,
octaves = 3,
persist = 0.5,
lacunarity = 2.0,
--flags = ""
}
tempthr = -0.4
end
-- These 2 must match biome heat and humidity noise parameters for a world

local np_temp = {
offset = 50,
scale = 50,
spread = {x = 1000, y = 1000, z = 1000},
seed = 5349,
octaves = 3,
persist = 0.5,
lacunarity = 2.0,
--flags = ""
}

local np_humid = {
offset = 50,
scale = 50,
spread = {x = 1000, y = 1000, z = 1000},
seed = 842,
octaves = 3,
persist = 0.5,
lacunarity = 2.0,
--flags = ""
}


-- Stuff

local difsval = DASVAL - NISVAL


-- Initialise noise objects to nil

local nobj_temp = nil
local nobj_humid = nil
local nobj_prec = nil


-- Globalstep function

minetest.register_globalstep(function(dtime)
for _, player in ipairs(minetest.get_connected_players()) do
-- randomise and spread processing load
-- Randomise and spread processing load
if math.random() > PROCHA then
return
end

-- check if in snow biome
local ppos = player:getpos()
local pposx = math.floor(ppos.x)
local pposy = math.floor(ppos.y)
local pposz = math.floor(ppos.z)
local nobj_temp = minetest.get_perlin(np_temp)
local nval_temp
if mg_params.mgname == "v6" then
nval_temp = nobj_temp:get2d({x = pposx + 300, y = pposz + 100})
else -- mgv5, mgv7
nval_temp = nobj_temp:get2d({x = pposx, y = pposz})
end
local snowbiome = nval_temp <= tempthr

-- check if snow is currently falling
local nobj_prec = minetest.get_perlin(np_prec)
local snowfall = nobj_prec:get2d({x = os.clock() / 60, y = 0}) >= PRECTHR
local nobj_temp = nobj_temp or minetest.get_perlin(np_temp)
local nobj_humid = nobj_humid or minetest.get_perlin(np_humid)
local nobj_prec = nobj_prec or minetest.get_perlin(np_prec)

-- check if player is outside
local nval_temp = nobj_temp:get2d({x = pposx, y = pposz})
local nval_humid = nobj_humid:get2d({x = pposx, y = pposz})
local nval_prec = nobj_prec:get2d({x = os.clock() / 60, y = 0})

-- Biome system: frozen biomes below heat 35,
-- deserts below humidity 20
local freeze = nval_temp < 35
local precip = nval_prec > (nval_humid - 50) / 50 + PRECOFF

-- Check if player is outside
local outside = minetest.get_node_light(ppos, 0.5) == 15

-- occasionally reset player sky
if math.random() < 0.1 then
if snowbiome and snowfall then
-- set sky to snow clouds
-- Occasionally reset player sky
if math.random() < 0.05 then
if precip then
-- Set overcast sky
local sval
local time = minetest.get_timeofday()
if time >= 0.5 then
time = 1 - time
end

-- first transition (24000 -) 4500, (1 -) 0.1875
-- last transition (24000 -) 5750, (1 -) 0.2396
-- Sky brightness transitions:
-- First transition (24000 -) 4500, (1 -) 0.1875
-- Last transition (24000 -) 5750, (1 -) 0.2396
if time <= 0.1875 then
sval = NISVAL
elseif time >= 0.2396 then
Expand All @@ -105,84 +108,61 @@ minetest.register_globalstep(function(dtime)
end

player:set_sky({r = sval, g = sval, b = sval + 16, a = 255}, "plain", {})
else -- reset sky to normal
else
-- Reset sky to normal
player:set_sky({}, "regular", {})
end
end

if snowbiome and snowfall and outside then
-- snowfall
for flake = 1, FLAKES do
minetest.add_particle({
pos = {
x = pposx - 48 + math.random(0, 95),
y = pposy + 12 + math.random(),
z = pposz - 36 + math.random(0, 95)
},
vel = {
x = -0.1 + math.random() * 0.2,
y = -1.6 + math.random() * 0.2,
z = -1.1 + math.random() * 0.2
},
acc = {x = 0, y = 0, z = 0},
expirationtime = 16,
size = 2.8,
collisiondetection = false,
vertical = false,
texture = "snowdrift_snowflake" .. math.random(1, 4) .. ".png",
playername = player:get_player_name()
})
if precip and outside then
-- Precipitation
if freeze then
-- Snowfall
for flake = 1, FLAKES do
minetest.add_particle({
pos = {
x = pposx - 32 + math.random(0, 63),
y = pposy + 10 + math.random(0, 4),
z = pposz - 26 + math.random(0, 63)
},
vel = {
x = 0.0,
y = -2.0,
z = -1.0
},
acc = {x = 0, y = 0, z = 0},
expirationtime = 12,
size = 2.8,
collisiondetection = false,
vertical = false,
texture = "snowdrift_snowflake" .. math.random(1, 4) .. ".png",
playername = player:get_player_name()
})
end
else
-- Rainfall
for flake = 1, DROPS do
minetest.add_particle({
pos = {
x = pposx - 8 + math.random(0, 16),
y = pposy + 6 + math.random(0, 4),
z = pposz - 8 + math.random(0, 16)
},
vel = {
x = 0.0,
y = -8.0,
z = 0.0
},
acc = {x = 0, y = 0, z = 0},
expirationtime = 2,
size = 2.8,
collisiondetection = false,
vertical = true,
texture = "snowdrift_raindrop.png",
playername = player:get_player_name()
})
end
end
end
end
end)


--[[ snow settling
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)
-- check under open sky
if minetest.get_node_light({x = sposx, y = pposy + 32, z = sposz}, 0.5) == 15 then
for y = pposy + 48, pposy - 48, -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
-- dirt with snow added under plants
elseif drawtype == "plantlike" then
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 --]]
30 changes: 20 additions & 10 deletions license.txt
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Original file line number Diff line number Diff line change
@@ -1,14 +1,24 @@
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
Version 2, December 2004
License of source code
----------------------

Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
The MIT License (MIT)
Copyright (C) 2014-2016 paramat

Everyone is permitted to copy and distribute verbatim or modified
copies of this license document, and changing it is allowed as long
as the name is changed.
Permission is hereby granted, free of charge, to any person obtaining a copy of this
software and associated documentation files (the "Software"), to deal in the Software
without restriction, including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Software, and to permit
persons to whom the Software is furnished to do so, subject to the following conditions:

DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
The above copyright notice and this permission notice shall be included in all copies or
substantial portions of the Software.

0. You just DO WHAT THE FUCK YOU WANT TO.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.

For more details:
https://opensource.org/licenses/MIT
Binary file added textures/snowdrift_raindrop.png
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