Scent has been translated into gaming environments to a degree. It's usually done with clouds of color layered atop the actual gaming visuals. I think Discworld Noir did this to a degree. Several other games too although I can't remember too many of them for some reason. Didn't Aliens vs Predator have something like that too? Where enemies would glow brighter if they were wounded because supposedly you could scent their fear?
Yeah, Alien vs Predator occurred to me while I was hiking today and thinking about this more. I started thinking about the rattlesnake I saw yesterday and wondered how a fps would simulate the heat sensing pits rattlesnakes and other pit vipers use for hunting and figured it would be something like alien or predators vision modes.
In a hypothetical game involving just about any non-ape mammals scent would be far more important than sight. I imagine the game being presented in black and white and color being used to represent scent marking for territorial purposes or hormones used in communication between members of the same species. Sound, as well, would have to be used to relay information far more in a game like that than it is in most games.
These are themes that occurred to me years ago in high school while I imagined some kind of ecosystem-sim-mmo. I never really figured out how it would end up working but it still seems like a cool idea to me.