Fresnel Reflection IOR index?

#1

Hi I’m wondering if someone knows a index of the IOR for different reflective surfaces like metal, paint and stuffs that are not refractive?

Because right now I just eyeball it.

Thanks in advance :slight_smile:

#2

Maybe this list helps
http://vray.info/topics/t0077.asp

#3

Yes thank you , this where the exact thing that I where looking for :thumbsup:

#4

If I am not mistaken, reflective and refractive IOR of materials are always the same.

Can’t find where I’ve read this, but the fresnel though should be applied only to dialectric materials (water, glass, etc.). Other materials (metal, wood, concrete, clothing, etc) behave differently.

#5

Zap has a great article on ior with metals:
http://mentalraytips.blogspot.com/2007/10/making-better-metal-with-miamaterial.html

#6

Can’t recall where we went over this topic myself, RickToxic, but the Fresnel effect actually applies to ALL materials. The BRDF adjustments we make are just workarounds to help clarify various microartifacts that our eyes tend to see as macroartifacts, basically. And since our renderings have a finite resolution (compared to human eyes) they tend to work a little better than the Fresnel with high IOR technique. Although all my metals these days are using Fresnel with a high IOR (30-50 depending).

#7

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