Change weather to be outside only, add underground skybox, add hud overlays

ca_weathers/deep_cave.lua

@@ -0,0 +1,20 @@
+local name = "regional_weather:deep_cave"
+
+local conditions = {
+	max_light = 14,
+	--max_height = -100
+}
+
+local effects = {}
+effects["climate_api:skybox"] = {
+	sky_data = {
+		type = "plain",
+		base_color = { r = 0, g = 0, b = 0 },
+		clouds = false
+	},
+	sun_data = { visible = false },
+	moon_data = { visible = false },
+	stars_data = { visible = false }
+}
+
+climate_api.register_weather(name, conditions, effects)