clouds3d:
- Star twinkle: 3 Hz ±45% -> 0.5 Hz ±15% (gentle scintillation
instead of static-like flickering)
- Night darkening: applied only to sky pixels via the cloud mask,
not to clouds. The darkening factor jumped 0.45 -> 0.85 so the
night sky really does go black around moonlit clouds. Clouds
keep their uLight-tinted colour so they remain visible.
clouds2d:
- Same darkening approach but via multiplicative factor (no cloud
mask in the 2D shader): col *= 1 - nightFactor * 0.7
Richard Zink
48160b730f