🌌 CelestiaFlow – Dynamic Skybox Shader for Unity

CelestiaFlow is a customizable skybox shader for Unity, designed for real-time projects such as games, VRChat worlds, and cinematic scenes.

It provides full control over skies, stars, clouds, sun, moon, and atmospheric effects.

CelestiaFlow – Dynamic Skybox Shader

CelestiaFlow is a highly customizable skybox shader for Unity.

It’s designed for real-time projects such as games, VRChat worlds, and cinematic scenes, giving full control over skies, stars, clouds, and celestial bodies, all part of the same.

Features

Highly Customizable

This shader is to be used as an all rounder. I tried to leave it as much customizable as I could so that you could adapt for your use case.

Day & Night Cycle

Smooth blending between daytime and nighttime skies, with adjustable colors, gradients, and intensity.

Sun & Moon

Customizable size, glow, rim lighting, and placement.

Stars

Multi-layered starfields with adjustable density, brightness, flicker, and rotation.

Clouds

Two separate toggleable layers of clouds, Background and storm clouds generated via noise functions (Perlin, Worley, OpenSimplex, etc.), with density, coverage, and motion controls. You can pick and change noise functions for different random effects during runtime.

Thunder Effects

Lightning flashes with rim glow for dramatic skies.

Ground Reflection

Adjustable ground color, offset, and reflection intensity.

Performance-Ready

Optimized for real-time rendering and VR.

Technical Details

Engine: Unity

Shader Type: Skybox Shader

Inspector Parameters: 50+ exposed settings for stars, sun/moon, clouds, thunder, reflections, and blending

Compatibility:

VRChat World SDK (Udon compatible)

Built-in Render Pipeline (HDRP not tested)

Package Contents

CelestiaFlow skybox shader

Example Prefab with already set values

Example Textures

License

Commercial and personal use allowed.

Redistribution of the shader itself is not permitted. Please credit when credit is due.

Not a standalone executable — requires Unity to use.