Cubemap Generator — Six-Face Skybox Export for Game Engines

Last updated 2026-07-08

Atmos Forge generates 360° skies from text prompts and exports them as six-face cubemaps — the +X/−X/+Y/−Y/+Z/−Z square faces many game-engine sky materials expect. Faces are converted from a seam-repaired equirectangular master, so edges line up cleanly between faces.

Cubemap export produces a ZIP of six square faces from the equirectangular master (paid plans).
Because the source seam is repaired first, adjacent cube faces match at their edges.
Equirectangular PNG export is available on every plan; use whichever your engine material expects.

What is a cubemap?

A cubemap stores a 360° environment as six square images — the faces of a cube surrounding the camera: right, left, up, down, front, back. Engines sample it as a cube texture for skyboxes, reflections, and ambient lighting. It is the traditional skybox format, and some materials and older pipelines only accept cube faces.

How do I generate a cubemap with Atmos Forge?

Generate or import a 360° equirectangular skybox.
Repair the wrap seam and decorate the sky as needed.
Choose Export and pick the cubemap option (paid plans) — you get a ZIP of six square face images.
Import the faces into your engine as a cubemap texture, or use the per-engine presets in the Export Guide.

Cubemap or equirectangular — which do I need?

Check what your sky material expects. Unity's Skybox/Panoramic and Godot's PanoramaSkyMaterial take equirectangular directly; Unity's Skybox/Cubemap and six-sided materials take cube faces. When in doubt, equirectangular is the more universal single-file format — and you can always export the cubemap later from the same skybox.

Why convert from a repaired equirectangular master?

Cube faces meet at twelve edges, and any discontinuity in the source shows up as visible lines between faces. Atmos Forge converts from an equirectangular master whose wrap seam has already been blended, so face edges line up. Converting an unrepaired panorama is the most common cause of visible cubemap borders.

Frequently asked questions

What are the six cubemap faces?

Right (+X), left (−X), top (+Y), bottom (−Y), front (+Z), and back (−Z) — six square images that together cover the full viewing sphere.

Is cubemap export free?

Cubemap export is included in paid plans (from $9/month). The free plan exports equirectangular images.

Which is better for performance, cubemap or equirectangular?

Engines sample cubemaps slightly more efficiently and without pole distortion, which is why they remain common for skyboxes. Equirectangular is simpler to author and store as one file. For a static sky, either works well in practice.

Can I get both formats from one skybox?

Yes. The same skybox can be downloaded as an equirectangular PNG and exported as a six-face cubemap ZIP — no need to regenerate.

About Atmos Forge

Atmos Forge is a web-based AI skybox generator for creating seamless 360° equirectangular skyboxes, cubemaps, and HDRI environment maps for game engines and 3D workflows. It combines AI text-to-skybox generation with procedural sky composition tools — seam fixing, suns, moons, planets, star fields, and sprite compositing — and exports game-engine-ready files for Unity, Unreal Engine, Godot, Blender, Three.js, Babylon.js, and WebGL. Atmos Forge is made by Big Monk Games.

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