Adds clear / rain / thunderstorm weather to a three.js scene driven by one eased wetness value — GPU rain streaks in a camera-following box slanted by wind, rain rings on the water, lightning with Poisson strikes, multi-pulse flashes and delayed Web Audio thunder, denser colder fog, slate/ink storm sky, darker clouds, dimmed sun/moon/stars/god rays, wind gusts and wet (darker, glossier) materials — using a base×factors pattern so nothing compounds. Use when adding rain, storm, lightning, thunder, weather cycle, wet surfaces or overcast mood to WebGL/R3F.
