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Weather mod: Tune cloud density variation

Previously, cloud density was too low at medium humidity.
Tune cloud density variation to match the default/classic value at
humidity midvalue 50.
Tune the lower limit of cloud density that occurs at extreme low
humidity.
Increase minimum cloud thickness to 2 nodes.
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paramat committed Apr 6, 2020
1 parent 4243d28 commit 720b24ed2d03d84f33427dc75bea0684a36b68c5
Showing with 14 additions and 6 deletions.
  1. +14 −6 mods/weather/init.lua
@@ -82,18 +82,26 @@ local function update_clouds()
nobj_speedx = nobj_speedx or minetest.get_perlin(np_speedx)
nobj_speedz = nobj_speedz or minetest.get_perlin(np_speedz)

local n_density = nobj_density:get_2d({x = time, y = 0})
local n_thickness = nobj_thickness:get_2d({x = time, y = 0})
local n_speedx = nobj_speedx:get_2d({x = time, y = 0})
local n_speedz = nobj_speedz:get_2d({x = time, y = 0})
local n_density = nobj_density:get_2d({x = time, y = 0}) -- 0 to 1
local n_thickness = nobj_thickness:get_2d({x = time, y = 0}) -- 0 to 1
local n_speedx = nobj_speedx:get_2d({x = time, y = 0}) -- -1 to 1
local n_speedz = nobj_speedz:get_2d({x = time, y = 0}) -- -1 to 1

for _, player in ipairs(minetest.get_connected_players()) do
local humid = minetest.get_humidity(player:get_pos())
-- Default and classic density value is 0.4, make this happen
-- at humidity midvalue 50 when n_density is at midvalue 0.5.
-- density_max = 0.25 at humid = 0.
-- density_max = 0.8 at humid = 50.
-- density_max = 1.35 at humid = 100.
local density_max = 0.8 + ((humid - 50) / 50) * 0.55
player:set_clouds({
density = rangelim(humid / 100, 0.25, 1.0) * n_density,
-- Range limit density_max to always have occasional
-- small scattered clouds at extreme low humidity.
density = rangelim(density_max, 0.2, 1.0) * n_density,
thickness = math.max(math.floor(
rangelim(32 * humid / 100, 8, 32) * n_thickness
), 1),
), 2),
speed = {x = n_speedx * 4, z = n_speedz * 4},
})
end

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