Realistic Rainbow Shader (VRChat)

Overview

This is an asset for VRChat worlds.

This is a realistic-looking rainbow shader that can be used in Unity, VRChat, and similar platforms. I created it with the idea of adding a natural-looking rainbow to worlds. It also represents secondary rainbows and the slightly brighter and whiter area inside the rainbow.

It includes three patterns: a rainbow that appears natural from one side only, a rainbow that is easily visible from all directions, and a halo-like rainbow with added noise, suitable for various effects.

Whether the rainbow is a semicircle or a full circle can be freely changed with the Mask parameter. Brightness, hue, and saturation are adjustable.

Reference video for the halo-like expression added in the update:
https://twitter.com/noriben327/status/1400398610613686273

Background skybox and objects are not included.

Description

Prefab files are located in the NoribenLunch/noribenRainbow/Prefabs folder.

Operational Verification Status

Verified to work in Unity2019.4.31f1 and Unity2022.3.6f1 Built-in RP & Linear Color environments. Usable in Unity, VRChat.

• VRChat Worlds
  • PC World: OK
  • Quest World: OK
• VRChat Avatars
  • PC Avatar: OK
  • Quest Avatar: No

Terms of Use

• Using in world creation or avatars: OK
• Redistribute / Sharing Files: Prohibited
• Reselling / Claiming it as your own work: Prohibited
• Including in avatars or worlds for sale: Prohibited

Update History

• 2020/10/11 V001 Initial release
• 2021/06/03 V002 Added the ability to add noise to the rainbow and to change the hue and saturation.
• 2022/03/11 V003 Supported Single Pass Stereo (Instanced) rendering. Changed folder structure.

Contact

https://twitter.com/noriben327

Material Parameter Explanation

• Mask: The amount of fading in the vertical direction.
• Rainbow Intensity: The brightness of the main rainbow.
• Secondary Rainbow Intensity: The brightness of the secondary rainbow.
• Inside White Intensity: The brightness of the whitish part inside the rainbow.
• Hue: Changes the hue.
• Saturation: Changes the saturation.
• Noise Tex: Texture for noise.
• Noise Size: The size of the noise.
• Noise Move Speed: The speed of the noise movement.
• Fresnel: The amount of fading when viewed from the side.
• Fresnel Angle: The angle at which it fades when viewed from the side.
• Cull: Allows changing of the culling.