I'm playing Daggerfall Unity.
And they a number of patches to the game, but the one I am looking here is Dynamic Skies. When you download mod patch, they describe the sky as a dome.

You know what? That's kinda spot on.
You can turn in place. You can look straight up. And weather, sun, and moon are drawn according to code procedure, with variations in days where the sun is too cloudy or foggy (or snowy) to be seen.
The primary difference is that our dome has a flat horizon while theirs starts high in the top, tapers down at the center, and goes back up. That is it has the ability to dome pitch, identical to that barrel distortion you showed earlier. I chalk that up to bad programming. The God who made the heavens and the Earth knows how to do a distortion-free dome.
Well, that and they have one sun and two moons.


Actually the sun never descends at all. The angle you view it from gets lower and lower, because it's a longer and longer view.
And as discussed and proven here…
Horizon did not block duck from view
https://www.theflatearthsociety.org/forum/index.php?topic=90722.0
A sun above a flat plane would never be physically blocked from view( as in the radiation physically blocked) by that flat plane if the viewer is also above the flat plane.
The issue isn’t gets “lower”. The issue is the sun and its radiation becomes physically blocked by the curvature of the earth.
You assume radiation continues on forever. Is that true? Not according to the Department of Transportation.
According to Today I Found Out, traffic lights have origins in the railroad systems of the 1800s. Train engineers needed a way to know when to stop their locomotives and when to slow down. Red was selected for stop since most people associate it with something potentially perilous or serious. (More importantly, red has the longest wavelength on the color spectrum and can be seen from greater distances, allowing operators to begin slowing down sooner.)
So the longer the wavelength, the farther it can be seen... Hmmmm. Almost like when something gives off yellow light goes outside the limits of its wavelength, it suddenly can't be seen...

Is due to a dishonest representation.
Along a straightedge…


Now with purposefully shifting the end to the left…



Yes, that was the point and you missed it. On the video, he shows us exactly how this distortion effect is created.
By purposefully shifting the end to the left.Only he didn't do it by messing with the Legos (or here with with Crayola), but it by keeping camera low (to create artificial horizon), and turning or tilting the camera just so.
I saw the video, and I saw him demonstrate this.