CustomSkybox
Replace the skybox on every map with your own 360 images. Includes 4 starter skyboxes, a labeled equirectangular template for editing your own, and a dropdown in ModMenu to switch between them. Vanilla compatible.CustomSkybox for STRAFTAT
Replaces the skybox on every map with your own 360° images. Pick a skybox from a dropdown in ModMenu's settings panel. Vanilla compatible — purely client-side, other players see vanilla.
Make your own skybox
Open BepInEx/plugins/CustomSkybox/templates/Template.png in any image editor (GIMP,
Photoshop, Krita, Paint.NET, Aseprite — anything). It's a 4096×2048 labeled canvas
with the horizon, zenith, nadir, cardinal directions, and a grid drawn on it so you
can see where everything will land on the sphere.
Paint over it however you like, then save it as .png or .jpg directly into
BepInEx/plugins/CustomSkybox/ (any name you want). Restart the game and it shows up
in the dropdown.
Two things to know about equirectangular projection
- The left edge wraps around to the right edge on the sphere. If you draw across the seam, make sure pixels at x=0 match pixels at the rightmost column or you'll see a visible vertical line in the sky.
- Anything painted near the top or bottom edges gets squashed to a point. That's how the projection works — the top row of pixels all becomes the single point directly overhead, the bottom row becomes the single point directly below. Don't waste detail there.
Use existing 360° images
You don't have to draw from scratch — drop any equirectangular .png / .jpg /
.jpeg file into BepInEx/plugins/CustomSkybox/ and it shows up in the dropdown.
Filename (without extension) is what you'll see.
Good free sources:
- Poly Haven Skies — CC0 daytime/sunset/overcast skies. Use the "Tonemapped JPG" download.
- Poly Haven Night HDRIs — CC0 starscapes and urban night.
- ESO Image Gallery — astrophotography under CC BY 4.0.
- NASA Photojournal — public domain space imagery.
- A 360° photo from your phone's panorama mode also works.
The image must be equirectangular (2:1 width-to-height ratio, e.g. 2048×1024, 4096×2048, 8192×4096). The bundled skyboxes are 4096×2048 — that's twice the base game's resolution, sharp without bloating the install.
Caveats
- New files require a game restart to appear in the dropdown — ModMenu caches the dropdown options the first time the settings panel opens.
- Baked reflection probes still reflect the original map's skybox. Only the runtime ambient probe updates.
License
Bundled images are individually licensed:
- Sunny Day.jpg — Poly Haven — Kloofendal 43d Clear — CC0
- Overcast.jpg — Poly Haven — Kloofendal Overcast — CC0
- Space 1.jpg — ESO — Milky Way panorama (eso0932a), credit ESO/S. Brunier — CC BY 4.0
- Space 2.jpg — NASA — WISE All-Sky Infrared (PIA15482), credit NASA/JPL-Caltech/UCLA — Public Domain