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Felipe Carvalho avatar image
Felipe Carvalho asked ·

Complex IOR in 3DS Max 2020

Hi, I was learning about the Complex IOR shading in 3DS Max 2019 and then updated to 2020, now I can't find the node anymore. Using MaxtoA 3.2.57 here.

shadingnodes3ds max
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Felipe Carvalho avatar image
Felipe Carvalho answered ·

Can anyone tell me if the node doesn't exist in the Arnold recent updates or if it is a problem with my 3ds Max version?

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Try look at Stephen's reply.
Also ->

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Thank you! And sorry, I really thought I had checked the docs. Plus, Boris' comment made me doubt about Stephen's reply so I needed one more.

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Stephen Blair avatar image
Stephen Blair answered ·

Complex IOR is deprecated (it's old and you should not use it).

The Standard Surface has the complex Fresnel built-in when the metalness is > 0, using the base and specular color.

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Really? Is Metalness parameter gives us physical correct IOR? For some metals or alloys its not enough two colors falloff. Do you know about measured IOR?

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