Hi everyone!
I got pico-8 yesterday and I am trying to learn lua.
for my first project I am trying to mod the raycasting demo to be a 3d platformer.
I got the running and jumping set to what I like, but I don't know how to set the map
so that it doesn't crash once it looks off the first screen in the editor. Any ideas?
I added a gif to show what it looks like. after the gif stops it means that my program crashes or
does not let me move, look, or jump in the game.

hello,
what does your raycaster code look like?
also, to clarify, crashes occur when a ray is cast and it never ends up hitting a wall? i've made a raycaster and encountered this same issue. there are a couple workarounds:
1: in the ray step routine, add a check to see if the ray steps outside the map area. if it does, stop stepping the ray and don't draw a vertical strip for that ray. will probably produce weird results if the ray starts outside the map area.
2: in the ray step routine, add a check to see if the ray is longer than a set threshold so the raycast can't take too long to find a wall. you'll probably need to figure out what a good maximum distance is and what to do if that maximum distance is reached.
3: silly solution that i used, just design the level to be completely enclosed so this never happens