Game engines and IOR

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rohMizuno Polycount Sponsor
Hey guys, I have a question concerning the use of IOR on games.
We know that one of the key points on making a believable material is adjusting the IOR value, specially when talking about metal and glass.
I know that there are ways to change the IOR value of your metal on engines like UE4 and unity, but my questions is:
Is that optimal? Is it commonly used on games? Or it will make the engine heavier by having this extra math going on behind every metal shader.
Thanks!

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