source on github - It's compiled into anx.p8 from a few different files then the whitespace and comments are stripped out into publish.p8. Start with main.lua which will be the easiest to read and which contains all the code and references to the other files.
This is a 3D game I've been working on for awhile which is not really done in that I'd like to put much more art in it (it has room for ~3x the art that's in there so far) but it's basically feature complete and playable so I figured I'd release a first version since the previous WIP was very old. The code is a little rugged and I'm not sure I'd recommend reusing it (although you totally can if you want) but I just thought it was a fun way to explore what Pico-8 was capable of while getting my hands dirty with low level 3D code. It doesn't perform super well and there's some room for further optimization but it's fairly far in the realm of diminishing return at this point when the game already mostly works.
It renders the walls and mobs differently, but what they have in common is that it starts from the left and renders every pixel column individually. If it detects that it's running out of time, it will skip a column by rendering the next column twice as wide. Using this method, it's able to (most of the time) keep up at 30 fps even though the underlying code is not super efficient or mathematically sophisticated. It's a little bit more complicated than this because it actually renders the pixel columns of the objects one at a time and sorts them by depth and figures out how wide each wallmob pixel is by which rays hit them, but that's the general idea.
When anxiety is accumulated, random vertical offsets are added to each pixel column to make them look sort of like rumbling books on a shelf as well as fisheye, field of view, height adjustments, and a terrible stress inducing music track. Once the panic attack hits... well, the books get torn apart ;P
Walls - Each pixel column is calculated indepe