96 lines
3.0 KiB
Lua
96 lines
3.0 KiB
Lua
local name = "regional_weather:ambient"
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local conditions = {}
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-- see https://en.wikipedia.org/wiki/Cloud_base
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local function calc_cloud_height(heat, humidity, dewpoint)
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local base = regional_weather.settings.cloud_height
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-- much lower scale like 20 instead of 1000 fitting for Minetest
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local scale = regional_weather.settings.cloud_scale
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local spread = heat - dewpoint
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local variation = spread / 4.4 * scale * 0.3
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return base + climate_api.utility.rangelim(variation, -scale, scale)
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end
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-- maps range of 0 to 1 to any other range
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local function map_range(val, low, high)
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return (val + low) * (high - low)
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end
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local function generate_effects(params)
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local override = {}
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local cloud_density = climate_api.utility.rangelim(params.humidity / 100, 0.15, 0.65)
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local cloud_thickness = climate_api.utility.rangelim(params.biome_humidity * 0.2, 1, 18)
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local cloud_height = calc_cloud_height(params.heat, params.humidity, params.dewpoint)
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local wind = climate_api.environment.get_wind({ x = 0, y = cloud_height, z = 0 })
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-- diffuse shadows when cloudy
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-- zero at density 0.65 and one at 0.15
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local cloud_shadows = 1.075 - (cloud_density / 0.5)
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-- diffuse shadows at dawn / dusk
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-- 15 hours between dawn and dusk accoring to https://wiki.minetest.net/Time_of_day
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local daylight_duration = 15 / 24
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local daytime = climate_api.utility.rangelim(minetest.get_timeofday(), 0.1875, 0.8125)
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-- zero at dawn / dusk and one at midday
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local daytime_shadows = 1 - (math.abs(0.5 - daytime) * 2 / daylight_duration)
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local shadow_intensity = map_range(cloud_shadows + daytime_shadows, 0.15, 0.4)
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local light_saturation = map_range(cloud_shadows + daytime_shadows, 0.9, 1.1)
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local skybox = {priority = 10}
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skybox.cloud_data = {
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density = cloud_density,
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speed = wind,
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thickness = cloud_thickness,
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height = cloud_height,
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ambient = "#0f0f1050"
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}
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skybox.light_data = {
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shadow_intensity = shadow_intensity,
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saturation = light_saturation
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}
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if params.height > -100 and params.humidity > 40 then
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skybox.cloud_data.color = "#b2a4a4b0"
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end
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if params.height > -100 and params.humidity > 65 then
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skybox.sky_data = {
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type = "regular",
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clouds = true,
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sky_color = {
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day_sky = "#6a828e",
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day_horizon = "#5c7a8a",
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dawn_sky = "#b2b5d7",
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dawn_horizon = "#b7bce1",
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night_sky = "#2373e1",
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night_horizon = "#315d9b"
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}
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}
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skybox.cloud_data.color = "#828e97b5"
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skybox.cloud_data.ambient = "#20212250"
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end
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override["climate_api:skybox"] = skybox
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if params.height > - 50 and not params.indoors then
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local movement = params.player:get_velocity()
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local movement_direction
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if (vector.length(movement) < 0.1) then
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movement_direction = vector.new(0, 0, 0)
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else
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movement_direction = vector.normalize(movement)
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end
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local vector_product = vector.dot(movement_direction, wind)
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local movement_penalty = climate_api.utility.sigmoid(vector_product, 1.5, 0.15, 0.9) + 0.2
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override["regional_weather:speed_buff"] = movement_penalty
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end
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return override
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end
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climate_api.register_weather(name, conditions, generate_effects)
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