Weather FX

The execution model is in blender-core. Sky, sun/moon, fog and mood come from blender-time-of-day, so run scene_mood.py first, then add weather. Rendering settings are in blender-rendering.

One call each

scripts/precipitation.py -- --type rain --intensity heavy --ground Street Roofs --wind 2 0
scripts/surface_weather.py -- --objects Street Car Walls --wetness 0.7 --puddles 0.4 --ripples 1 --streaks 0.5
scripts/lightning.py -- --flashes 2 --strokes 3
scripts/precipitation.py -- --type snow --intensity moderate --ground Terrain
scripts/surface_weather.py -- --objects Terrain Roofs --snow 0.8 --snow-depth 0.06
scripts/surface_weather.py -- --objects Street Car Walls --remove     # exact restore

A rainy night: scene_mood.py --time night --fog-visibility 250 → rain → wetness + puddles → lightning. Rain and puddles at night are what sell a wet scene: wet surfaces reflect every practical light.