https://docs.godotengine.org/en/stable/tutorials/3d/global_illumination/faking_global_illumination.html
Faking global illumination — Godot Engine (stable) documentation in English
Why fake global illumination?: Godot provides several global illumination (GI) techniques, all with their advantages and drawbacks. Nonetheless, it remains...
faking global illuminationgodot enginestabledocumentationenglish