mirror of
https://github.com/minetest/minetest_game.git
synced 2024-11-17 23:38:14 +01:00
126 lines
3.1 KiB
Lua
126 lines
3.1 KiB
Lua
-- Disable by mapgen or setting
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local mg_name = minetest.get_mapgen_setting("mg_name")
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if mg_name == "v6" or mg_name == "singlenode" or
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minetest.settings:get_bool("enable_weather") == false then
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return
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end
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-- Parameters
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local TSCALE = 600 -- Time scale of noise variation in seconds
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local CYCLE = 8 -- Time period of cyclic clouds update in seconds
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local np_density = {
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offset = 0.5,
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scale = 0.5,
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spread = {x = TSCALE, y = TSCALE, z = TSCALE},
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seed = 813,
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octaves = 1,
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persist = 0,
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lacunarity = 2,
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}
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local np_thickness = {
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offset = 0.5,
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scale = 0.5,
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spread = {x = TSCALE, y = TSCALE, z = TSCALE},
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seed = 96,
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octaves = 1,
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persist = 0,
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lacunarity = 2,
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}
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local np_speedx = {
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offset = 0,
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scale = 1,
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spread = {x = TSCALE, y = TSCALE, z = TSCALE},
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seed = 911923,
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octaves = 1,
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persist = 0,
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lacunarity = 2,
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}
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local np_speedz = {
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offset = 0,
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scale = 1,
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spread = {x = TSCALE, y = TSCALE, z = TSCALE},
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seed = 5728,
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octaves = 1,
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persist = 0,
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lacunarity = 2,
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}
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-- End parameters
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-- Initialise noise objects to nil
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local nobj_density = nil
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local nobj_thickness = nil
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local nobj_speedx = nil
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local nobj_speedz = nil
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-- Update clouds function
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local function rangelim(value, lower, upper)
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return math.min(math.max(value, lower), upper)
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end
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local os_time_0 = os.time()
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local t_offset = math.random(0, 300000)
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local function update_clouds()
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-- Time in seconds.
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-- Add random time offset to avoid identical behaviour each server session.
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local time = os.difftime(os.time(), os_time_0) - t_offset
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nobj_density = nobj_density or minetest.get_perlin(np_density)
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nobj_thickness = nobj_thickness or minetest.get_perlin(np_thickness)
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nobj_speedx = nobj_speedx or minetest.get_perlin(np_speedx)
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nobj_speedz = nobj_speedz or minetest.get_perlin(np_speedz)
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local n_density = nobj_density:get_2d({x = time, y = 0}) -- 0 to 1
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local n_thickness = nobj_thickness:get_2d({x = time, y = 0}) -- 0 to 1
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local n_speedx = nobj_speedx:get_2d({x = time, y = 0}) -- -1 to 1
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local n_speedz = nobj_speedz:get_2d({x = time, y = 0}) -- -1 to 1
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for _, player in ipairs(minetest.get_connected_players()) do
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-- Fallback to mid-value 50 for very old worlds
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local humid = minetest.get_humidity(player:get_pos()) or 50
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-- Default and classic density value is 0.4, make this happen
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-- at humidity midvalue 50 when n_density is at midvalue 0.5.
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-- density_max = 0.25 at humid = 0.
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-- density_max = 0.8 at humid = 50.
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-- density_max = 1.35 at humid = 100.
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local density_max = 0.8 + ((humid - 50) / 50) * 0.55
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player:set_clouds({
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-- Range limit density_max to always have occasional
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-- small scattered clouds at extreme low humidity.
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density = rangelim(density_max, 0.2, 1.0) * n_density,
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thickness = math.max(math.floor(
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rangelim(32 * humid / 100, 8, 32) * n_thickness
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), 2),
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speed = {x = n_speedx * 4, z = n_speedz * 4},
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})
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end
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end
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local function cyclic_update()
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update_clouds()
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minetest.after(CYCLE, cyclic_update)
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end
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minetest.after(0, cyclic_update)
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-- Update on player join to instantly alter clouds from the default
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minetest.register_on_joinplayer(function(player)
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update_clouds()
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end)
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