CityGen V1.3 — Thousands of Lights with Zero Light Actors

CityGen V1.3 just shipped on Fab, and the new release brings a full day/night cycle to the procedural city. Buildings light up at sunset, street lamps cast warm pools on roads, atmospheric fog shifts color with the sun — and there are zero point lights or spot lights in the scene.

The whole illumination system is driven by a single Material Parameter Collection scalar, written by a Time of Day actor, read by emissive materials on every window, lamp, and decal. One scalar. Six materials. Thousands of glowing lights with no performance cost from lighting.

🏙️ Get CityGen on Fab
🎮 Free playable demo: Playable Demo
Patreon Member Project Files

What V1.3 brings to CityGen:

✔ Full day/night cycle with configurable hours

✔ Sun/moon directional lights with lux-scale intensities

✔ Building window emissive illumination

✔ Street lamp emissive bulbs + ground spill decals

✔ Distance fog with sun-direction-driven color shift

✔ PostProcessVolume exposure transitions day↔night

✔ SkyLight interval-based recapture (no per-frame cost)

✔ PreviewInEditor button for live time scrubbing

✔ Auto-clear buildings on road placement

✔ Demolish preview ghost

✔ Dezone on demolish

✔ Block zone painting on bridges

Let me know what you think.