Ultrawide and triplewide setups will suffer from stretching at the edges of the full display. With a few additions to the Engine.ini config, we can leverage Unreal Engine's built-in Panini Projection algorithm and eliminate all of that stretching. UE's Panini projection implementation is based off a well known thesis of human/artistic perception versus rectilinear projection that is commonly used to display 3D worlds in video games.

More accurately predict distances, get a better and more accurate sense of speed, have clearer visuals through corners and bends, immerse yourself more, and ultimately, hopefully have more fun and set better times.

This in-engine feature uses a post-process to manipulate and upscale the rendered scene based on 3 variables and then displays the altered render.

Guide contains before and after screenshots, some explanation on the variables and their values, and the benefits and potential downsides.

*UPDATED VARS:* Dec 8th 2023: Using HeadCam (the one that you can move). My in-game FOV is 12. Using DLSS Quality - Sharpness 80. Panini.S adjusts the projection angle of your side monitor. Values close to 0 will be helpful for flat ultrawides. Values closer to -1 will be for enclosed rigs with monitors that go past your natural irl FOV. I use 5820x1080p res Triples. Eyes are 26" away from center monitor. Side monitors are 60º.

[/script/engine.renderersettings]
niagara.CreateShadersOnLoad=1
r.NGX.DLAA.Enable=false
r.NGX.DLSS.AutoExposure=0
r.NGX.DLSS.Reflections.TemporalAA=0
r.NGX.DLSS.DilateMotionVectors=1

[SystemSettings]
r.Upscale.Panini.D=1.0
r.Upscale.Panini.S=-0.24
r.Upscale.Panini.ScreenFit=1.0
r.ScreenPercentage=60
r.PostProcessAAQuality=0
r.TemporalAA.Upsampling=0
r.TemporalAA.Algorithm=0
r.TemporalAA.R11G11B10History=1
r.Tonemapper.MergeWithUpscale.Mode=0
r.TemporalAACatmullRom=0
r.SecondaryScreenPercentage.GameViewport=110
r.HLOD.DistanceOverride=40000, 100000, 200000, 400000