IOR numbers

Started by james adamson, August 31, 2020, 08:31:49 am

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james adamson

Hi all.
I have a number of buildings with image maps already baked. They mainly consist of brick and plaster and various tiles.
What I am trying to get is some nice fresnel reflections on these objects so I thought a good starting place would be IOR. I have found many charts online but they seem to give numbers for base materials that make no sense to me in the real world. 

Obviously the UV maps are baked and cover various different materials. (I will worry about that later.) My starting point is brick! Brick is made from clay/shale?
How do I find the IOR for clay or shale? Then Plaster? What is plaster made from in terms of an IOR chart?