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Just finished the latest video by pannenkoek2012 (of "half an A press/parallel universes" fame), and please just inject this into my veins. I haven't even played Super Mario 64 and had no idea invisible walls were a common problem in it, but I am a big, big appreciator of diving into game mechanics to explain exactly why the thing happens, and this video is just that for nearly four hours, in an incredibly satisfying way. He splices in videos of Twitch streamers raging as Mario bonks against empty air or dies out of nowhere or suddenly teleports under the floor, in between cheerfully replicating it and explaining precisely what was actually going on there.
(Some of the sequences of individual explanations of particular invisible walls can get lengthy and more spelled-out than they needed to be, but even then we didn't actually find ourselves skipping any of it, though you could.)
Just as a taste, you'd think invisible walls mean there's for some reason a wall there that's invisible, that maybe used to be there but the developers failed to fully remove it - but while that happens a couple of times, most invisible walls are instead caused by something like rounding errors or developer fumbles that lead to teeeeny-tiny gaps or misalignments in the level geometry, which lead to the game calculating a bunch of individual columns one 3D-pixel-equivalent wide as being part of the "hitbox" of a ceiling or out-of-bounds region somewhere below the floor. And he's modded the game to visually show these errant hitboxes, so you can actually watch what it is that Mario's bumping against. It's just concentrated step-by-step making the previously incomprehensible comprehensible. All I want is to understand everything like this and help other people understand it too.