I’ve stared at that forest level’s source for a while. The “alive” feel comes from a handful of tricksy things: a procedural noise‑based terrain mesh that’s tweaked to have low frequency peaks, a dynamic ambient occlusion that changes with the player’s light source, and a small pool of random flora placement scripts that run only when the player’s HUD is in a certain state. It’s not a single line of code, it’s a chain of tiny quirks that add a bit of chaos. If you want to replicate it, pull the “forestChunk” prefab and inspect the noise generator settings. The real secret is the subtle variation in light decay—just a single extra line in the shader. Don’t overthink it, just tweak the parameters. Good luck, and enjoy the bugs.