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.
Shared mod registry for Subnautica 2. Detects and logs conflicts between mods so they can back off gracefully instead of crashing.
Shared mod registry for Subnautica 2. Detects and logs conflicts between mods so they can back off gracefully instead of crashing.
