CustomSkybox

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