SkyGen: Procedural Skybox Generator for Godot 4

SkyGen is a Godot 4 editor dock that generates seamless equirectangular skyboxes with no painting, no HDRIs and no shaders. Pick a preset, move a few sliders, press Generate, and you get a PNG plus a ready PanoramaSkyMaterial in your project.

What it makes

• Gradient skies (zenith, horizon, ground colours, curve control)
• A sun with disc size, colour, glow radius and strength, at any azimuth and elevation
• Stars placed evenly on the sphere (seeded, with brighter stars getting a small cross)
• Nebula layer: two colours, scale, intensity, patchy by design
• Cloud layer: coverage, edge softness, scale, colour
• Six presets: Clear Day, Golden Sunset, Starry Night, Purple Nebula, Alien Dawn, Overcast
• Output 256 to 4096 px wide (height is always half), 8-bit PNG, seamless at the wrap edge
• Same seed and settings always give the same sky; "Random seed" rolls a new one

How it works

Install the addon, enable it in Project Settings > Plugins, and the SkyGen dock appears next to the Inspector. Preview renders a 512 px version in well under a second; Generate and save writes the full-size PNG and a <name>_sky.tres PanoramaSkyMaterial you drag into a WorldEnvironment. The generator is one GDScript class (SkyGenCore) with no editor dependency, so you can also call it from your own tool scripts or at runtime (procedural skies per level, per seed).

Compatibility: Godot 4.2 to 4.5, any renderer (Forward+, Mobile, Compatibility). Pure GDScript, no GDExtension. CPU-side generation: about a second per 1024x512 plain sky, longer with nebula and clouds; a 4K sky with every layer can take about a minute.

Free LITE version: the SkyGen LITE page has the same tool capped at 1024 px wide, with three presets and without the nebula and cloud layers, so you can try the workflow first.

License: use the addon and every generated image in unlimited personal and commercial projects, no attribution needed. Do not resell or redistribute the addon itself.

Made by The_KnightShift. Written with AI assistance (Claude) and verified headless on Godot 4.5; every output is procedural, no photographs or third-party textures. Questions and bug reports in the comments below.