Forgot to put ildprut's movement doc in the description at first but its there now go look at it!

@C.A._Old

6 ай бұрын

*i wounder about 2007 version. and 2006 version. because 2007 version. when you try rocket jump. you can bunnyhop it too. Rare Great Fact.*

@GeneralZimmer

6 ай бұрын

Ildprut is 2 Danish (I'm assuming) words combined which are fire and fart. That should explain his profile picture. And the Danish pronunciation is nothing like how you did in the video.

@anarch0possum

6 ай бұрын

this document is something that ive hoped exists for a while now, you and ildprut have just saved me a massive amount of reading source code by myself. big thanks

@fnutek3720

6 ай бұрын

Shush and come dmix

@acegriddles3559

6 ай бұрын

Love this video. Ok some vsh custom maps they have a cone that you can also get stuck in by just shoving it with a sticky into yourself and you can do the same thing with the trampoline and flame thrower

Hitbox's buggy Weight aint heavy There's jank in his movement already, source's spaghetti

@billybobjoephilcorncobtiptopge

6 ай бұрын

my clips are sweaty

@karlsundkvist6603

6 ай бұрын

yer funny lad

@jojobod

6 ай бұрын

You missed a line

@skinnybuggo

6 ай бұрын

@@jojobod i had some ideas in mind for the first line but i didnt like any of em much, i like "clips are sweaty" from the first guy though

@cranker7753

6 ай бұрын

Was listening to meat grinder and read this 😭

After 9 years in development, hopefully, it will have been worth the wait.

@vilian9185

6 ай бұрын

9 years with so much quirks an fun, yes it was worth

@vivelespatat2670

6 ай бұрын

Thanks, and have fun.

@somebadrobloxboy5068

6 ай бұрын

Bro botted his comments likes

@Falcon15x

6 ай бұрын

After 9 years in development, spy.

@WMMWMWMWMWMWMWMWMMWMWMWMWMWMMW

6 ай бұрын

And my favorite class is the spy.

The idea that soldier crouches to lessen his weight in order to effectively rocket jump at peak height is genuinely funny to me

@spartanwar1185

4 ай бұрын

It LITERALLY sounds like his own logic, doesn't it? As if he's explaining how he would do this in a real life setting

@I-Stole-Your-Toast700

2 ай бұрын

*soldier laugh* "You see heavy, I crouch before jumping with my rockets to reduce my weight!" "it dont work like that" "Yes it do"

@reinorgaming2179

15 күн бұрын

Sounds like a gag from an old tf2 comic

there is enough spaghetti in this video to solve world hunger

@HellnawNaw-zq2jx

4 ай бұрын

Based

@PrismTheLoser

Ай бұрын

@@HellnawNaw-zq2jxand spaghetti pilled

I thought the center of your bounding box being closer to the explosion amplifies how much damage and knockback you take from it, which is why ctapping works. Not because you actually weigh less when the box is smaller. Getting miniaturized by a spell or server plugins also lets the center of your bounding box get much closer to explosions and lets you get a lot of distance from rocket or sticky jumping.

@fredjump8107

6 ай бұрын

both the centre of your bbox being closer to an explosion and your character weighing less have an effect on the knockback

@iHateHandlesGetRidOfThis

6 ай бұрын

I've been under the interpretation that the center of the bounding box doesn't have anything to do with it, because in the context that it does, what is the caber's problem? It doesn't do directional knockback like other weapons only shooting you straight up (implying the explosion is more central), and does max damage if you hit somebody in the foot with it

@Jazztral

6 ай бұрын

I was under the impression it was because, while being in a crouching animation, gravity is set to 0 for like 1 tick or frame. That’s how max height crouchjumps work, but I guess the Ctap is as he said.

@abstractbeholdings1030

6 ай бұрын

@ id assume that the devs made an exception or added specific code for it otherwise all other melees would have similar effects. my guess and assumption

@enzoaugusto1577

6 ай бұрын

But he said that in the video

Ah, its finally been explained. As a map maker, I often find myself getting stuck on the edges of slopes that I have made out of clip brushes that are supposed to be there to *prevent* that sort of thing from happening, whether vertically or horizontally. And whenever it happens I can never recreate it! I've been playing the game for 11 years now so my movement is so intuitive that I don't even think about what I'm doing anymore, but now that I know all I have to do is spam a and d, this should help a lot. I think the easiest way to fix this on maps now is just to have the "tip" of an angled clip brush go inside the wall 1hu.

back when teletraps were possible on slopes it was way easier to do stuck launches, just get into your own trap and destroy the entrance when you had enough speed

@StilvurBee

6 ай бұрын

i remember doing that on cp_orange all the time, lots of fun

@rachelslur8729

6 ай бұрын

tele traps are no longer possible ? i thought they were still possible

@user-lh3qy1xb7s

6 ай бұрын

​@@rachelslur8729tele destroys itself when players stuck at it

@shinobuoshino5066

6 ай бұрын

@@user-lh3qy1xb7s would be a problem if someone found a bug that lets you to get stuck at your engineers teleporter in a way that destroys it to troll your own team or maybe for even a spy to silenly destroy a teleporter without a sapper or decloaking...

@unr34L-

5 ай бұрын

@@StilvurBee:(

I think one reason why there is a very small gap between the player and the wall in Source was mentioned in a video where some devs of half-life 2 watched a modern speed run of it. One of the dev’s mentioned while developing the engine that one bug they ran into with calculating the players movement was if a player kept walking into a wall, you’d end up building up momentum incredibly quick before dying from impact by the games calculations and all the velocity you built up. Some form of it is still in Half-Life 2 where at the start of the game with the moving train you run across. You get pushed across by a trigger to the other side safely once, but if you get back on the train again with no push trigger now you’ll stand there for a few seconds and get crushed from the train pushing you into the wall while building up your velocity.

@itch433

6 ай бұрын

I don't have any insight on source case specifically, but him saying that the concept of keeping a small gap between the collision bodies in a physics engine is dated sounds like gibberish. People are so hasty to explain any technical weirdness in tf2 as an "old games thing", but it still works the same in modern games, like how you specify a "skin width" on a character controller in unity, it's the same thing. It's just an efficient way to make sure the objects aren't intersecting due to a floating point error and nothing has changed in the way floats are stored in memory since half life.

@baconandx1858

6 ай бұрын

@@itch433 Yeah many devs still use very hacky stuff to keep things working. On a Stalker video it was mentioned where if they don’t add Demon Sidorovich into a level in the beta then the game would break and cause crashes, and some modern indie devs do this still.

@Elenrai

4 ай бұрын

@@baconandx1858I had a friend do some stuff in htlm about 17 years ago, we had an issue and instead of finding the fuckup, we just decided to copy an older template that worked and manually adapt it by pasting in code from the broken template line by line The internet is held together by literal bandaid solutions that constantly break in new ways and I love how it defines humanity

@aloedg3191

2 ай бұрын

that happened in the og doom games

It's really crazy to see the work I did several years ago for pixel surfs still being somewhat relevant, you did a great job explaining how specific they are.

Me and some trade minecraft buddies ended up finding that trampoline bug a few months back and nicknamed it the "trade minecraft space program". Its possible in neonheights by using a team taunt to jam someone in the enemy teams respawn room visualizer, and possible in realms by jamming yourself into a wall or floor using the minecarts. Very cool to see theres spots in official maps that support their own space program!

Holy shit, this has to be the best explanation video for TF2 movement in the internet so far. Seriously, despite playing this game for a decade, I never knew that making bounding box smaller by crouching makes you weigh less. And that's the reason why CTap was possible? Jesus, unreal.

the video shown at 29:12 is my video, and its kind of crazy the same one was shown in both yours and elmaxo's video on spy haha Kind of wish i was asked beforehand or at least credited in the description but still cool to see

@Sporkyz74

2 ай бұрын

Seems like you've been added to the description now :)

This is like the highest level tf2 video Ive ever seen. Excellent not only for the showcase but your explanations. I had no idea there was actual technique to some of these bugs. I thought a lot of the wall bugs were luck. 10/10

The Linux bug seems similar to how TF2 servers give you a different amount of ammo on Linux servers. If I can recall, that was because of some C++ functionalities in GCC (a C++ compiler for Linux or some Windows binaries through something like MinGW) handling floating point numbers or math a bit differently.

@asj3419

6 ай бұрын

It's kind of horrifying that the the compilation is os-dependent given that usually this game has a game server on Linux talking to game clients ON WINDOWS. How does this game even work when the client and server keeps disagreeing on basic maths?

@agrastiOs

6 ай бұрын

Not HP, ammo. And honestly Linux servers are the standard, Windows servers have stuff that isn't the way it should be. All Valve servers are on Linux.

@KingKrouch

6 ай бұрын

@@agrastiOs thanks for the correction. Will update my comment.

@terradoom8503

6 ай бұрын

​@@asj3419compilation being OS dependent is kinda just the reality of compilers, though in this case I assume they probably don't compile with the options for maximum float compliance or whatever, causing the compilers to slightly change how they choose to order stuff. Things like fused multiply-add could also (in theory, haven't read up) have different accuracy implications at like the 10th decimal place or something, and some compilers might use them and others not.

@asj3419

6 ай бұрын

@@terradoom8503 Apparently there are multiple floating point instructions that compute to different precisions, and that's how the healthpack bug happens (shounic did a video on it). I know that it's practically unavoidable but physics really should be fully consistent and deterministic if the game is multiplayer like this. The question really is how the hell one would do such a thing.

I'm positively surprised how... well surprising even the first one was. I was thinking like yeah this video won't explain anything new to me but I'll give it a watch but I always thought crouching just makes your center closer to explosion but now that I know that it's weight, it makes so much more sense.

Thank you for making this video! I remember a while back I was trying to find resources on jumpbugs and texturebugs and there wasn't anything useful. But no longer!

Man, if I knew that weight loss was as simple as just crouching, I would've done it more often.

@shinobuoshino5066

6 ай бұрын

It is.

@valkry_

4 ай бұрын

Just do some squats

the fact that you demonstrated something on jump_demonstrationman is funny

27:48 Oh hey, I used to do something that I called *The Trampoline* that was basically a super simple version of this that almost worked everywhere. Some time ago as Engineer, you were able to place a teleporter exit below a teleporter entrance on a slope. This, of course, would get you stuck in the entrance because you'd teleport into it from the exit. Then you could get infinitely give yourself knockback with a sentry and heal off the damage with a dispenser. I remember letting my friends trampoline off my head in front of first Blu spawn in Upward.

Why do I recognise that thumbnail...

@Sprudvig

2 ай бұрын

Its 3 boxes with white text...

@dusk611

Ай бұрын

seems familiar

honestly this is an example of what makes wow classic and osrs so good, the jank adds charm and depth when you learn to use it to your advantage

I love this, I've been waiting for a video like this summarizing all the source movement/physics bugs for a loong time... Thank you

Great video! Really appreciate all the explainations. A bunch of the tick related bugs can't really be catered for I think, pretty much every game works via a tick system and checking for something the next tick or what have you is unavoidable

27:55, "All you need is a friend, and something to get stuck inside of" Bro??? 0.o

there's a pixel surf used to do on mountain lab on that building in front of blue spawn, it was a lot of fun to do i didn't realize it was a bug to actually surf across that thing. ive been doing that for years lmao

My face when a video game engine made in 2004 combined with messy code makes buggy movement

I tried to link the document, but I think it got bopped. EDIT: Link is in the description now. Also people seem to think that crouchjumping brings your center closer to the explosion? It's the exact opposite since you "raise your legs" when you crouch in the air, bringing you further away (plus it's technically your bottom center that's used for explosions that happen under you). You'd be closer to the ground if you just jumped without crouching, but that'd be worse because the game treats you as having more mass. That's what cool about c-taps, they're the best of both worlds: you're crouched AND right above the ground.

I remember back before blue moon, you used to be able to build teleporters on top of each other on certain slopes. By teleporting inside of your entrance, you could very easily perform the trampoline and stuck launch bugs, it was a lot of fun and I kind of miss it.

6:04 "i can fit through both holes with ease"

You can also put a teleporter under your sentry to get stuck in it in certain spots like stairs, similar to the old teletrap exploit

12:05 Ori music? In a tf2 source spaghetti video? Instant subscribe.

I love the white text highlighted with magenta using a very stark, sharp font.

The level of in-depth knowledge in this video is insane, very informative and useful! One thing I wanted to know though, are you able to explain how ctapping in shallow water can propel your rocket jumps even further?

I finally understand how the out of bounds exploits I used to do as a teen in vanilla TF2 work 16 years later. Thank you 😭 THE WIGGLE at Gravel Pit C point went crazy

"This just in, a source engine game is jank, no one is surprised more at 11"

i gotta mention that the music choices in this vid are awesome. you somehow got two tracks from both my all time fav games (a short hike & rain world) and that's just so dope

The 0.03125 unit offset at 7:30 also has so e weird collision with the raycasting code used for hitscan weapons, as it can let you shoot through walls where box and non-box map brushes touch each other (for corners face more towards the non box brush, opposite for wall intersections)

did you know that on some maps with angled displacements, you can actually climb the meshes to do what's known as a pixel ladder? i assume it has to do with the pixel walk glitch in some way but given that it's a displacement, you can jump across the entire mesh that displacements have

I'm like halfway through the video and already know it's an ingenious creation- well done friend

ngl, the hades music at 23:00 is a nice touch

Hate scout, and I play ultrakill

@LilPootisGaming

3 ай бұрын

Lmao

@DiffGameContent

5 күн бұрын

3 months gap through the comments

@davidklemen5264

4 күн бұрын

Cant really combo a scattergun, shitty pistol and bat? I don't think you can throw a coin and then snipe it with your pistol..

@Ozzianman

3 күн бұрын

​@@davidklemen5264 Probably can't even chain coins.

Great video! Amazing edits, also!

Thank you for making a video like this, this knowledge takes thousands of hours of SOURCE ENGINE (in its entirety, all versions too, some engines carry over certain bugs in the movement) movement. I love it but sometimes people don’t know about the techniques and assume it to be a script of some kind. Hats off to you man, for showing that yes, it is very possible. And with time and effort put into it, can be done very very reliably. (No matter what movement tech it is, edgebug, ctapping, etc)

Wow so much stuff I genuinely didn’t know. The first thing about crouching and mass is blowing my mind. So much time playing source games and I just didn’t know that. Great video.

Some of these (edgebug and wallbug in particular) are also present in GoldSrc. These are often used in climbing maps or 'Hide n Seek' gamemode. The difference is that GoldSrc' servers are frame-based, so your own FPS matters a lot in how it will perform. For example, it's not really possible to get stuck on a wall like seen in TF2, you will always fall albeit using the strafing to stop the momentum (at least from my own experience).

You used to be able to do the stuck launch on a ramp where you built the teleporter entrance on top of the exit, when you use the teleporter you would get stuck and then build up momentum with for example a mini sentry.

Ive done the trampoline tech before on Engi. There use to be a bug where you make trap teleporters on slopes that would get players stuck, its patched now as far as I know. I would get myself stuck and then damage myself with the Wrangler to activate the jump bug.

Thank you, you put a new pov to my tf2 knowledge appreciated

I been learning Soldier for a while and i couldnt get rocket jumping to be as good as everyone else does.. but findind this video explains so much.. now i think i have to bind my crouch to another key to make it easier everytime i do rocket jump

I literally did not know most of these things... great video man, you earned a sub. looking forward to more videos in the future

I think you forgot the to link Ildprut's document, or maybe I'm blind. Can I get a link? it looked interesting af

absolutely lovely video, and lovely music selection :)

This video's wicked sick! You've earned my sub. Question, though: do we get a full, in-depth maths episode or not? I'm a bit of a nerd myself so I enjoy hearing about the maths whenever possible.

I'd love it if you made a 2nd video with all the maths explained!

i saw a guy do a stuck launch on 2fort, when his sentry was upgrading from level 2 to 3 he jumped and got stuck inside the sentry then shot rockets and flew across the map and killed me while i was playing sniper

Ok now we need an hour long video filled with wall bug clips

this explained a lot of janky things i came across over my years of playing

Enjoying these TF2 vids mate, takes me back!

It’s not a bug, it’s a feature -Gabb Nowerd

great video, knew the tech but I'm glad to now know how it all works under the hood, cheers!

you can do wallbug on displacements too (works fine on dustbowl cliffs)

As someone coming back to tf2 after playing csgo for a while, this is very helpful. I would love to get more details in particular for how bunny jumping, runboosting, ladder boosting etc work in tf2.

Ah yes, my favorite long-ranged class: the Pyro

13:44 I may be thinking of something different yet similar but I can pretty consistently surf along the edge of the tunnel in 2fort using demo knights charge, its amazing for killing cocky tunnel snipers since the speed lets you surf up the stairs too and if you time it right you can instantly crit them

27:47 ive seen this bug in several games heres what i think is happening when a part has high velocity it tries to move in that direction if something stands on it they will both have that velocity but when the first part cant move but keeps its velocity it still transfers it to the second part and when that velocity is high it flkings the second part this bug is used in roblox studio for conveyor belts

another htwo video another banger :D was a very nice surprise to see myself appear in the video too hahahaha

Nice video! I normally click off these types of videos because most TF2 youtubers have such an ego it’s cringe, but your video was just a good informative video. You really dove deep into this!

I might be wrong on this, but isn't the "tick perfect sandvich" the same as the phlog taunt cancel? Either way, it's pretty cool to see that it works with any kind of "taunt" animations

@AveryHyena

6 ай бұрын

Yes

Actually the stuck sentry launch jump can be done without cart- but you need an inclined surface on any map- you put a teleport entry on the incline and then the teleport exit right UNDER it- you teleport and get stuck in the teleport- then you shoot yourself with the wrangler(putting dispenser right by your side saves you from dying)- and then you destroy the teleport- the momentum you've benn genrating by shooting is released and you go into the air

I love the fact that "ildprut" means "firefart" from Danish to English

there's a weird way to get stuck in displacements if you can place a dispenser underneath where a displacement vertice sticks out creating a ceiling to crouch and to get stuck in. you have to crouch holding W going left and right (on the dispenser) to find a spot where your Y velocity starts bugging out between 7 and -11 (this probably varies, the more up the better). stop holding crouch (still holding W) and tap A & D ~5 units where you found it. youll stop moving when you get stuck, pick up the dispenser to make sure

At 1:38 there is an insane medic crossbow heal btw. Respect for the medig

Ctaps can also be used for backstabs. If you ctap on top of someone, you can backstab while midair allowing you to gain momentum and possibly backstab someone else while ur landing Plus with pixelwalking, you can use +strafe and make it way easier

@shinobuoshino5066

6 ай бұрын

Trickstabbing is cool and all but did you know that you can write a keybind for instant turnaround to troll any spy trying to do this?

@Anshhhhhhhhhk

6 ай бұрын

@@shinobuoshino5066 just use ur mouse

@shinobuoshino5066

6 ай бұрын

@@Anshhhhhhhhhk nah I'm not risking getting stabbed when my bind trolled thousands of spies who thought that they're very smart.

Actually very nice video explaining a lot of useful things and covering this theme completely* *I really wanted to see more maths behind this, sure that's not going to be super boring, but for another video (on the second channel or whatever) - is going to be great Anyways, deserves a like and subscribe!

I heard "the fire is gone." Also great video. Thanks for the ultrakill music, right as i started taking a break from that soundtrack lmao

I have had a pixel surf happen exactly once, I was playing scout and got launched by an enemy soldier into it. Never knew that this was something that actually had a name since I just blamed source spaghetti at the time and have never had it happen again. The stuck launch, I used to do that on a trade server with friends because you could combine the trampoline with a stuck launch and basically catapult anyone that landed on you until you destroyed the building (We used tele's on ramps) which then subsequently launched the engie.

Hey Htwo, it might be something else entirely different, but on JA west coast I've seen some of the teachers, donors, and regulars pretty consistently wedging themselves on the walls of, well, Easy Walls - and it looks just like the pixel surf. I even managed it once! Easy Walls 10's 45 degree wall seems to be particularly prone to this wedging. Maybe it's made of a particularly large number of brushes??? IDK, either way you should check it out because it's pretty neat and if I and so many others can do it after just a couple of minutes then maybe there's some insight into setups for it you could discover! EDIT: Just a few seconds later and now I see that this is already understood behavior lol. So much for potentially discovering something new.

Great video, great channel. This is the best jump content on youtube.

I'm curious about that ildprut document, but I couldn't find it in the description or google 👀

Yo the soundtrack of this video goes crazy. Some of my favorite games.

I have been playing the game over the 6 years and never heard of crouching literally makes you weight lighter. Good video!

I will watch every video about tf2 or momentum mod on your channel

Damn this was a great video, a lot of stuff I didn't know. Nice!

Highly informative, this video will be pretty useful!

The bounding box determining mass seems like a good, simple calculation for everything but crouching. Small boxes and freight container mass, mini characters getting knocked back further than wumbo characters...

Its a rare day for me to learn so much new stuff about a game ive played for over a decade

Awesome video ! Would’ve been sweet to explain how mappers use and calculate height/velocity to make jumpbugs/bouncehops and bounces consistent 😉

@htwo1

Ай бұрын

Good point actually, I have no idea how they calculate it, but there are website apps out therd that let players calculate it on the fly

Hey Htwo, I'm happy that you made a video on this topic, since there's so many different niche topics that the general community doesn't know. Especially when it comes to the jumpbugs and texturebugs. There were even a thing or two I learned from this video. Hope you've been doing nicely! Also you should come back sometime to play some pass time pugs... ;) Edit: Wanted to also say that you gotta love the tomato tom clips lol

@PND40

6 ай бұрын

🏀

now I know how bhops work your jumping mid tick so the game never seeing you hit the floor

the edge bug was made into an official feature via counterstrike map de_nuke

I always thought that the crouching to make the bounding box smaller was to put the bounding box further away from the source of the explosion making it so the knockback was greater so the explosion wouldn’t “clip” the bounding box and all the push would be from the same direction. The fact that literally just making the bounding box smaller makes it lighter and more susceptible to any form of knockback is hilarious.

@bac0ntoast

6 ай бұрын

And also that c tapping did the opposite thing

Cmon bruh I found out about the wall bug myself after thousands of hours of source games and now u giving this info out ;( also got edgebugged over 100 times when bhopping

I love this video, thanks for the knowledge 😁

33:50 is there a reason you pick it up? wouldn't destroying it let you try some funny market-garden type shenanigans?

Infinite range flamethrower bug is so fun lol, there are many places in random maps that you can do them like for example in dustbowl of the second map part you go behind that small "house" and on the cliff next to place where is blue team you do ctrl + w and spam a+d and you might get sucked into wall + not get damage from most things if it's done correctly lol. If not melee or ammo (and enemy pyro attacks) you could've been unstoppaple lol

I only knew like 4 of these lol, the weight of the bounding box, c-tapping, and obviously rampslides and stuck launches (in fact i've beaten many jump maps as engineer, and not all jumps are doable with a simple stuck launch, there's more you can do as engineer, though one of the most exploitable tricks is dependent on a plugin most jump map servers run)

where is the big document you mentioned? you said it would be in the description but i don't see it there

I thought the crouching in a rocket jump was because the character brings the feet up instead of Crouch down, meaning you fall down. And in that time, if you shoot, you are a little closer to the ground than standing up

Now i know how to t pose in the sky as heavy, great.