Rendering Glass

AmbientOcclusion
1

What is the best material setting for glass?

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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

3

What does Index do with Metal?

4

It’s the refractive index of metals: https://refractiveindex.info/