I have little knowledge of this topic but from what I gather in a Ray Tracer each ray is given its own wavelength as opposed to an RGB value. This automatically simulates Dispersion and Fluorescence. Is this called Spectral Rendering?
What are the approaches usually taken to render Iridescence? Could someone give a brief overview of the method and a reference to a resource I can use to learn more in-depth knowledge I can use for implementation?