Separate weathers from engine

ca_weathers/rain.lua

@@ -0,0 +1,44 @@
+local name = "regional_weather:rain"
+
+local conditions = {
+	min_height		= regional_weather.settings.min_height,
+	max_height		= regional_weather.settings.max_height,
+	min_heat			= 30,
+	min_humidity	= 40,
+	max_humidity	= 60
+}
+
+local effects = {}
+effects["regional_weather:spawn_puddles"] = true
+effects["regional_weather:wetten_farmland"] = true
+
+effects["climate_api:sound"] = {
+	name = "weather_rain",
+}
+
+effects["climate_api:particles"] = {
+	min_pos = {x=-9, y=7, z=-9},
+	max_pos = {x= 9, y=7, z= 9},
+	exptime=0.8,
+	size=1,
+	texture = "weather_raindrop.png"
+}
+
+local function generate_effects(params)
+	local avg_humidity = 40
+	local intensity = params.humidity / avg_humidity
+	local override = {}
+
+	override["climate_api:sound"] = {
+		gain = math.min(intensity, 1.2)
+	}
+
+	override["climate_api:particles"] = {
+		amount = 20 * math.min(intensity, 1.5),
+		falling_speed = 10 / math.min(intensity, 1.3)
+	}
+
+	return climate_api.utility.merge_tables(effects, override)
+end
+
+climate_api.register_weather(name, conditions, generate_effects)