Alien Worlds Skyboxes: 16 Exoplanet Skies (Godot 4 + Unity)

Sixteen skies seen from the surface of other worlds, ready for Godot 4 and Unity.

Launch sale: 25% off until 7 October ($2.99), or all three skybox packs for $7.50 in the Discounted Skyboxes bundle. The free Skybox Sampler has two skies from each pack in the same formats.

A ringed gas giant mirrored in a calm ocean, twin suns over a desert, a red supergiant glaring through ash clouds, a shattered moon trailing debris. Each sky is a full 360 degree environment with clouds, haze, a ground or sea below the horizon, and planets and moons that sit behind the clouds. No seams and no pinching at the poles.

The 16 skies
01 Twin-Sun Desert, 02 Ringed Giant over Ocean, 03 Red Dwarf Dusk, 04 Purple Jungle World, 05 Ice World Aurora, 06 Volcanic Ash World, 07 Binary Sunset with Edge-On Rings, 08 Nebula Night and Crescent World, 09 Airless Moon with Planetrise, 10 Green Methane Sky, 11 Storm World with Giant Moon, 12 Tidally-Locked Terminator, 13 Thin Air with Daytime Stars, 14 Shattered Moon with Debris Arc, 15 Blood-Red Supergiant, 16 Teal Twilight with Three Moons.

What you get

• 16 panoramas at 2048 x 1024 (PNG) and 4096 x 2048 (JPG)
• 1024 x 1024 cubemap faces for every sky, named for both Godot (px, nx, py, ny, pz, nz) and Unity (Front, Back, Left, Right, Up, Down)
• A Godot 4 addon with a sky material and an Environment for each sky, plus a demo scene
• README, a Unity import guide and the license

A second download has the 16 panoramas as lossless 4096 x 2048 PNG. The free sampler has 3 skies (Ringed Giant over Ocean, Volcanic Ash World, Tidally-Locked Terminator) at lower resolution, so you can test the import before buying.

Using it

• Godot 4: copy godot/addons/alien_skyboxes into your project and assign an environments/<sky>.tres to a WorldEnvironment. Tested in Godot 4.5.
• Unity: import the six PNGs from cubemaps_unity/<sky>/ into a Skybox/6 Sided material (Front, Back, Left, Right, Up, Down); UNITY.md has the steps. Checked in Unity 6000.0.84f1: the faces line up with no seams, horizon level, sky upright. Works in Built-in and URP.
• Other engines: anything that takes equirectangular panoramas or six-face cubemaps (Unreal, Bevy, three.js, Blender).

Good to know
Images are 8-bit LDR sRGB, not HDR. These are stylized paintings, not simulations: the clouds have a flat painted look, and the ground is a plain or sea meant to be covered by your own terrain. Several skies are strongly coloured on purpose; lower ambient_light_energy in the Environment if one is too bright for your scene. Seams were checked numerically and every sky was reviewed by eye.

License
Royalty-free for commercial and non-commercial games, apps and videos. No attribution required. You may modify the images for your own projects, but you may not resell or redistribute them as assets. Full text in LICENSE.txt.

AI disclosure
Made with AI assistance: the skies are painted by code that an AI wrote, then checked by eye and by numeric seam checks.

More from The_KnightShift

• Space Skyboxes: 20 Stylized Skies - nebulae, planets, black hole, galaxy ($3.99)
• Stylized Sky Skyboxes: 16 Day, Sunset, Night and Storm Skies ($3.99)
• Stylized Seamless Materials: 24 Tileable PBR Textures ($5.99)
• Skybox Sampler: 6 Free Skies - free, same formats, try the import first

All three skybox packs are 25% off in the Discounted Skyboxes sale until 7 October: $2.99 each or $7.50 for all three.