What is the best material setting for glass?
Depending on the situation, you can use a ThickDielectric or a ThinDielectric. You can tweak the index parameter to simulate the different types of glass. Normally the index of refraction for glass is in the range 1.5 - 1.8
What does Index do with Metal?
It’s the refractive index of metals: https://refractiveindex.info/