Irridescent Glass Shader

[YAFU (English is not my native language)]

Hi.

GPU Compatible Thin-Film Interference v2.1: Glass Within Glass + Absorption

Update Pending: See post 72 for update v2.2 Hey everyone! Welcome to the colorful update of v2.1 of the thin-film interference node group which was originally adapted from @prutser’s OSL code. Here is pruster’s original thread. This new update generalizes Snell’s law for lossy incident media (such that R+T is always 1 when the films are not lossy), adds absorption, and allows the dielectric inputs and outputs to be calculated with RGB values like everything else. Only the “Interference”/“Thi…