GGX Tail Falloff guidelines?

[kimmo_hernborg]

Are there any guidelines on when to change the GGX tail falloff?

So far I have left it at the default value of 2 and just changed the roughness value. Should certain type of materials have different GGX falloff values?

[aleksandar.kasabov]

Hello kimmo_hernborg,

Please note that there isn't a specific list of values for different materials as different surfaces of the same material could have different values. For example, hammered or scratched steel would have a different value than polished steel. Have a look at this article where you can find more information on the matter.

You can also check this article (keep in mind that this information is not published on our website and we cannot guarantee it its accuracy, completeness, or reliability). Thank you.