Add rain. Remove mgv6 support. Add humidity noise to control rarity of precipitation. Use MIT source code licence

README.txt

@@ -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)

init.lua

@@ -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,
@@ -25,24 +19,11 @@ 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,
+-- 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,
@@ -50,52 +31,74 @@ else
 	lacunarity = 2.0,
 	--flags = ""
 }
-	tempthr = -0.4
-end
+
+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
@@ -105,27 +108,30 @@ 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
+		if precip and outside then
+			-- Precipitation
+			if freeze 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)
+							x = pposx - 32 + math.random(0, 63),
+							y = pposy + 10 + math.random(0, 4),
+							z = pposz - 26 + math.random(0, 63)
 						},
 						vel = {
-						x = -0.1 + math.random() * 0.2,
-						y = -1.6 + math.random() * 0.2,
-						z = -1.1 + math.random() * 0.2
+							x = 0.0,
+							y = -2.0,
+							z = -1.0
 						},
 						acc = {x = 0, y = 0, z = 0},
-					expirationtime = 16,
+						expirationtime = 12,
 						size = 2.8,
 						collisiondetection = false,
 						vertical = false,
@@ -133,56 +139,30 @@ minetest.register_globalstep(function(dtime)
 						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 --]]

license.txt

@@ -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