An example of iridescence shader extending the Lit shader in Unity URP.

Single-layered thin-film BRDF by Laurent Belcour and Pascal Barla's paper.

• Single-layered thin-film (Soap bubble)
• Multi-layered thin-film
• Diffraction grating (CD-ROM)
• Biological iridescence (Morpho butterfly wing scales)

I'll need to further study the underlying principle of these iridescences and find a way to modeling them that suitable for real-time rendering.

• Unity 2019.3.2f1 or higher
• Universal Rendering Pipeline 7.4.1

• Model - UnityBall by Unity Technologies
• Skybox - TV Studio by Sergej Majboroda
• Skybox - Spruit Sunrise by Greg Zaal

CC0-1.0

CC0