regional_weather/ca_weathers/ambient.lua

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local name = "regional_weather:ambient"
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local conditions = {}
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-- see https://en.wikipedia.org/wiki/Cloud_base
local function calc_cloud_height(heat, humidity, dewpoint)
local base = regional_weather.settings.cloud_height
-- much lower scale like 20 instead of 1000 fitting for Minetest
local scale = regional_weather.settings.cloud_scale
local spread = heat - dewpoint
local variation = spread / 4.4 * scale * 0.3
return base + climate_api.utility.rangelim(variation, -scale, scale)
end
-- maps range of 0 to 1 to any other range
local function map_range(val, low, high)
return (val + low) * (high - low)
end
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local function generate_effects(params)
local override = {}
local cloud_density = climate_api.utility.rangelim(params.humidity / 100, 0.15, 0.65)
local cloud_thickness = climate_api.utility.rangelim(params.base_humidity * 0.2, 1, 18)
local cloud_height = calc_cloud_height(params.heat, params.humidity, params.dewpoint)
local wind = climate_api.environment.get_wind({ x = 0, y = cloud_height, z = 0 })
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-- diffuse shadows when cloudy
-- zero at density 0.65 and one at 0.15
local cloud_shadows = 1.075 - (cloud_density / 0.5)
-- diffuse shadows at dawn / dusk
-- 15 hours between dawn and dusk accoring to https://wiki.minetest.net/Time_of_day
local daylight_duration = 15 / 24
local daytime = climate_api.utility.rangelim(minetest.get_timeofday(), 0.1875, 0.8125)
-- zero at dawn / dusk and one at midday
local daytime_shadows = 1 - (math.abs(0.5 - daytime) * 2 / daylight_duration)
local shadow_intensity = map_range(cloud_shadows + daytime_shadows, 0.15, 0.5)
local light_saturation = map_range(cloud_shadows + daytime_shadows, 0.8, 1.2)
local skybox = {priority = 10}
skybox.cloud_data = {
density = cloud_density,
speed = wind,
thickness = cloud_thickness,
height = cloud_height,
ambient = "#0f0f1050"
}
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skybox.light_data = {
shadow_intensity = shadow_intensity,
saturation = light_saturation
}
if params.height > -100 and params.humidity > 40 then
skybox.cloud_data.color = "#b2a4a4b0"
end
if params.height > -100 and params.humidity > 65 then
skybox.sky_data = {
type = "regular",
clouds = true,
sky_color = {
day_sky = "#6a828e",
day_horizon = "#5c7a8a",
dawn_sky = "#b2b5d7",
dawn_horizon = "#b7bce1",
night_sky = "#2373e1",
night_horizon = "#315d9b"
}
}
skybox.cloud_data.color = "#828e97b5"
skybox.cloud_data.ambient = "#20212250"
end
override["climate_api:skybox"] = skybox
if params.height > - 50 and not params.indoors then
local movement = params.player:get_velocity()
local movement_direction
if (vector.length(movement) < 0.1) then
movement_direction = vector.new(0, 0, 0)
else
movement_direction = vector.normalize(movement)
end
local vector_product = vector.dot(movement_direction, wind)
local movement_penalty = climate_api.utility.sigmoid(vector_product, 1.5, 0.15, 0.9) + 0.2
override["regional_weather:speed_buff"] = movement_penalty
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end
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return override
end
climate_api.register_weather(name, conditions, generate_effects)