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!