Let’s say I have a design which relies on TIR between high index and low index glass with a coating between them:

In sequential mode I can model this surface as a mirror, but let’s say my incidence angles span 45 to 80degs and I want to model the relative illumination effects from the less than prefect reflection over incident angles and wavelengths. Is there any way to do this?

Thanks in advance for any advice,

John