glitches by himme

I have two glitches (one which I believe is kind of useless for HL2 speedrunning).

Voiddrop (the useless one):

This glitch can be used to drop to the first FREE non-void (out of bounds) space below your current position. It can be as far apart as you want, and they rooms dont even have to be "connected" in any way. The reason why it is useless is that it only works if the players solid-keyvalue is set to 0. This is standard in some mods to allow players to walk through each other, but I dont think HL2 ever sets that. All you have to do is to basically go and stand on a prop while you yourself is non-solid. You'll end up in the first non-void space below your current position after a few seconds at most.

(sv_cheats 1; ent_fire !self addoutput "solid 0")

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Voidwalk (the possibly useful one, blame my old friend for the name :P):

This glitch basically lets you jump through ceilings. You can even jump on top of the map into the void if there isn't a room above you.

If you know how that old crouch-sprint glitch was done, then you this glitch isn't far off. I'll explain the old crouch-sprint glitch just in case:

1) Go somewhere where the game forces you to crouch, say a vent
2) Position yourself as close to the vent-opening as possible while standing up
3) Let go of all keys, then crouch, and walk just a tiny bit into the vent so that you stay crouched even when releasing the crouch-button.
4) Release the crouch-button, then hold the sprint-button, quickly step out of the vent and then back in (you will see your character stand back up for a brief moment, then go back into crouching by himself)
5) As long as you hold the sprint button down, you should be able to sprint while crouching (been quite a while since I played, so I dont remember the specifics if you can let go and then sprint again whenever you want)

That's the basic crouch-sprint. I believe someone even used it in that official HL2DM tournament that was around several years ago.

To get the added effect of jumping through the ceiling, continuing on from step 4), it is pretty much just a jump-crouch away.

6) This step is done pretty much simultaneously as 4, as soon as you step back into the vent and see the glitchy stand-up animation, you need to be sprinting and crouch-jump (not easy if you use space as your jump key, mwheel works better). By crouch-jump, I mean, jump first and immedietly crouch afterwards.

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Doing that will make you clip into the ceiling (hence why I compared it to your quantum-crouch), and if the ceiling is thin enough, you will be forced up and go through it completely. Thicker ceilings you will just get stuck in, and players (in multiplayer) can see your feet sticking down :P. If they (or you yourself) shoot a physics object at your feet to propel you upwards, if you're lucky it can force you straight through the brush, no matter the size. You can also void-walk through physics objects. The thickness of ceiling you can go through depends on your initial speed, the higher it is, the thicker you can go through, but it also gets more and more hard to time with higher speeds.

It's hard to explain in detail without a video showing it, but it really is basically just the sprint-crouch followed by a jump-crouch with very precise timing :P

I think if I spent some time with the quantum-crouch glitch or looking for a substitute, I could get it to work with the newer Source engine, but I don't have that kind of time right now.

For the sprint-crouch method, it should work anywhere where your character is forced to crouch even if you dont have the crouch-button pressed. Vents, ramps leading into the ceiling and other such stuff.

You can actually clip through ceilings just by having enough vertical speed and crouching at the right moment. I used to play on a modded server where we had a command that would give us a decent amount of speed upwards to jump higher. Spamming that command and crouch sufficiently near a ceiling (but not close enough to lock us into crouch-mode) would let us pass through the ceiling after a few tries. Pulling something like that off in a speedrun would probably be too risky though, more suited for a TAS x.x...