Obligatory link to the in-progress forum post about the development of The Return of the Obra Dinn's dithering effect: https://forums.tigsource.com/index.php?topic=40832.msg136374...
The difficulty for dithering on an interactive 3d scene is in making the dithering stable on camera rotation, otherwise you get a twinkling stars effect, not dissimilar to the "fireflies" in reflections in ray-traced games.
And here's a couple videos about a technique that was inspired by the Obra Dinn's dither, but making it surface stable:
https://www.youtube.com/watch?v=HPqGaIMVuLs (explanation)
https://www.youtube.com/watch?v=EzjWBmhO_1E (demo)
These are absolutely amazing, thank you! I had wondered whether something like this was possible because I have this 1-bit-deep screen here, and now I'm delighted to see that it is. I'm just not sure if my machine has enough CPU to manage it.