Trying to create this kind of material

[CarlG]

Light dependent color shifts are not possible in Cycles, only view dependent. The car you posted looks like it has a light dependent iridescence shift like ChromaFlair. If you can live with screen based effects, the work around is to first render out color by light using Eevee only shader2rgb, and use the rendered image with window coordinates to obtain the color for a Cycles material.

My shading, textures, and material experiments

With 2.80 upcoming, I decided to do some experiments, and maybe convert some of the old stuff. For this first one I know that in Cycles we can’t (yet) do stuff that depends on scene brightness, but Eevee have this awesome Converter/ShaderToRGB node. With that in mind I loaded up the BMW test scene and used Eevee to generate a render where the color changes with how much light that pixel receives. That Eevee image comes out like this: [BMW_ColoredGlossy] I now simply mapped that image using …

Perhaps you could do an actual full bake for every frame, or capture it as a reflection ball or something. I never tried. I was just having some fun with Eevee back in the day.