It's hard to explain exactly. it has to do with the diferrances between domed eyeball lens, "flat" math and simulated lens's.
Each game does it differant and has a default setting. Generaly called FOV and reffers to to the field of vision you can see from edge to edge.
Even a single screen has some "curve" to it. If you focus on the corner of a screen and swing the screen around slowly you will see it.
Idsoftware games (doom, quake, rage and Valve games) the default is FOV 90 ..on the triples you need FOV 145-150.
Bethesda (oblivian, fallout, skyrim) default is 75 ..on the triples you need FOV 90 or so.
In reality the extra 2 screens are NOT for looking at, just like the edges of a single screen. They are for your perrifferal vision, your mind will sort them out just fine. Natualy. If they were not curved it would be un-natual and apear to "shrink away" instead.
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