Description
LumenGI
Subnautica 2 · Graphics · Quality of Life
Subnautica 2's global illumination already looks stunning — but if you have a modern GPU, you're leaving quality on the table. LumenGI adds five GI quality presets controlled by F-keys, including full Lumen hardware ray tracing. Watch light scatter through ocean water, bounce off alien coral, and spill out of bioluminescent creatures in real time.
v1.1 — fixed cvar execution, added F-key bindings, improved Low preset lighting. No extra mods needed.
Presets
Low — maximum performance
Minimal Lumen. Best for weak or older GPUs.
Medium — balanced
Lumen on at lower quality. Good starting point.
High — software Lumen
Full software Lumen. Looks great on most modern GPUs.
Epic — maximum software Lumen
Everything maxed without hardware RT. Needs a strong GPU.
Epic w/ ray tracing Featured
Full Lumen hardware ray tracing. Real bounce lighting, real reflections.
How to use it
Install UE4SS and drop the LumenGI folder into Binaries/Win64/ue4ss/Mods/
Rename main.lua.txt → main.lua and mod.json.txt → mod.json
Launch Subnautica 2 and press an F-key while in-game
Requirements
Subnautica 2 — Early Access, any version
UE4SS 3.0.1 or higher
Required for F-key bindings and cvar support
Windows PC only
RTX 20xx+ or RX 6xxx+ — for F6 only
All other presets work on any GPU.
Settings reset on game restart — just press your F-key again. If F6 crashes or shows no change, your GPU likely doesn't support DXR — press F5 instead.