Closest vanilla linedef actions can be to each other and trigger?

[Clippy]

Like with vanilla I know if two action lines are too close together they won't work but how close can they be?

 

I'm always guessing and want to maximise my close line potential

[Btyb88]

I wanna say 16 units but that's mostly a guess

[esselfortium]

For walkovers, they can be right on top of each other, as long as more than 8 aren't being triggered at a time (due to the spechits limit), and any lines in front of teleports are far enough away that the teleport action doesn't eat them (just need at least 1 tic of time between crossing each of them).

 

For switches, they need to be far enough apart that you have room stand with the middle of the player thing past the front switch, so they should be at least 16 units apart, or 32 units apart if you don't want it to be noticeable that one switch is blocking the other.

[Clippy]

@esselfortium spectacular information, thanks a bunch!

[ViolentBeetle]

On subject of switches, a single-use line disappear and no longer blocks the use action afterward. At least if it's itself is switch or door. Useful for hiding buttons in closets.

[Stabbey]

Also, switches which are behind sectors with 0 units of height between them and the player can't be pressed at all, no matter how thin the line is.