Weather

• Weather map (WeatherMap3D): one weather state round the camera (wind, cloud cover, rain, wetness, puddles), read by every shader through global uniforms, raster and path traced.
• Wind: slows near the ground (roughness_length); gusts follow the measured spectrum and travel with the wind.
• Wind near the ground (add_canopy, add_shelter_box, gust_patch_size): shelter inside plant canopies and behind buildings; gust patches sweep across fields.
• Storms (add_storm): drift with the wind, with a rain core and a downdraft.
• Lightning and thunder (WeatherLightning3D): strikes from storm cells at a rate set by cloud-top height, lit by their own channel under path tracing, with sharp shadows in raster too (raster_shadow_distance) and thunder made from the channel.
• Precipitation haze (WeatherMap3D.set_precipitation_extinction()): snow and rain haze the air in raster fog and the path traced medium; blowing snow is a lit layer near the ground.
• Wet surfaces and puddles (surface_storage, puddle_drain_rate, temperature, humidity): fill with rain and dry by evaporation; materials with Wetness on darken and gloss up.
• Followers: water waves grow with the weather’s wind (follow_weather); cloth and hair move in it (weather_wind).

Images#

Weather map: a storm’s cloud, rain core, wind and the wet ground it leaves.

Wet surfaces: the sand darkens, puddles form and catch the sky.

Lightning: the channel lights the ground and casts sharp shadows from the blocks, raster and path traced.

Precipitation haze: in a blizzard the blowing snow hides the distance.