Okay, but how does airstrafing ACTUALLY work?

[@Mokeysniper]

i have waited 370 years for this

[@zevidmusic]

Here we go

[@Zdanigmd]

Hi mokey (btw u, macro, and zweek should all do an FFA in Titanfall 2, just a recommendation)

[@Quaki3000]

My first thought when I saw the video in the feed: He's still alive!!!

[@LqdAim]

Smells like updog

[@chad6]

Tapstrafe in apex is a crime and a crutch.

[@r3eech]

Went 120kph in a school zone just to get home to see this 🙏

[@the1whoplayz]

mkbhd's alt located❗

[@Quellems]

Were you strafe jumping?

[@budderboy_]

hey i know this guy!

[@CommunistRainbowdash]

"Officer, I wasn't swerving erratically, it's called strafedriving!"

[@sonicobg1]

did bro get flung by BT on the way back?

[@zweekSR]

I'm realizing in hindsight the shit I said about the cod series might be the some most unhinged and partially unintendedly ragebaity words i have ever said in my entire life and i apologize to the entire call of duty speedrunning community i love u please do not punch me in the butt

[@lexydrow]

Lmao, people just can't stop bashing COD nowadays, even if unintentionally, no worries

[@nayuki2020]

don't worry that's the part we (i) skipped

[@CashMayo]

Aside from my nostalgic love for MW3 and BO2, and their movement and gunplay, I totally agree with you, especially on WW2!!! In the WW2 multiplayer there is jump fatigue, which makes sense... BUT, in the HQ, there is NOT. And probably unintentionally, that means that the HQ 1v1 Pit also has NO JUMP FATIGUE. You can straight up just strafejump into bunnyhops across the small arena, and it is probably the best thing Call of Duty has ever done. Period. *Oh, and I have an ancient video on my channel that showcases this I think

[@thislink1519]

Baiting people to fist him. SMH

[@unnamed3810]

@zweekSR Have you even seen what a COD4 or mw2 speedrun looks like?

[@Msushi]

This video changed my life.

[@twigtarsier]

the professional bhopper is learning how it works

[@dafp8833]

Didn't expect you to be here

[@mikkelens]

I mean you literally said that about the recent Celeste TAS recording like yesterday but I guess a life can be changed more than once

[@gaubbe]

This comment changed my life.

[@prinlerdsri405]

Wait you the portal speed runner guy

[@ThaRixer]

You know this took a while to make when bro is sitting outside in the summery grass and it is currently winter. Great job zweek, your constant curiosity in wanting to learn stuff and explain it to the world is noticed and we're all here for it

[@themothpope1720]

LMAO THATS CRAZY YOU DID NOT NEED TO PUT HIM ON BLAST LIKE THAT

[@Nextracer1]

What is this video? For the blind, its vision. For the hungry, its food. For the thirsty, its water. If this video thinks, I agree. If this video speaks, I’m listening. If this video has one fan, it is me. If this video has no fans, then i no longer exist.

[@thewhitefalcon8539]

so you're telling me this video is a beautiful woman who likes me

[@treee6400]

​@@thewhitefalcon8539 Nope. Sorry to break it to you bud; If you've found this video, you're too far in the wrong direction

[@lentencraft]

4:10 3blue1brown jumpscare. really funny, while also working well as an explanation lol

[@user-fl6op8jz5n]

LMFAO

[@tomatoanus]

incredibly work zweek!!

[@MentalCheckpoint]

*taking notes*

[@bigerik4600]

so thou breast breaths life yet

[@Sean.R]

Dude come backkk

[@32557]

Wooo !!! are you coming back?

[@Barmem]

Wait, I thought you were dead

[@ThrowTop]

as a source engine connoisseur I already knew most of the math behind why strafing works, but these visualizations were fantastic and I had no clue how many games actually used a quake based game engine. (I've never played a COD game)

[@Michtar]

Hi throw

[@Vanity0666]

Me when I finvsqrt all over the floor

[@treee6400]

​@@Vanity0666I really hope that doesn't mean what my brain thinks it means

[@Joevenon]

Quake 1 movement is really the percursor of everything I love about movement in FPS games, that's why I used it's engine for my game BRAZILIAN DRUG DEALER 3: I OPENED A PORTAL TO HELL IN THE FAVELA TRYING TO REVIVE MIT AIA I NEED TO CLOSE IT

[@jvgradiz906]

Isso é o dia basico do brasileiro

[@JuanGamer0202]

Oh não eu acidentalmente abri um portal para o inferno na favela **pela terceira vez**

[@yoshi_oz]

The editing is SO GOOD on this video, literally on my belly kickin my feet in the air when I see a new Zweek video.

[@Carth531]

Close enough, Welcome back FUNKe

[@fancysonn]

i love the 3b1b segment

[@paprikar]

the vsauce meme too!

[@selumnaaaaa]

It's insane how complicated under the hood something so intuitively easy to learn and use ingame is, it just feels perfectly natural even with some of the limits added after quake1. Great video

[@twpsyn]

in summary: god bless id software for gifting the world quake

[@eliasprice7553]

It always amazes me how unintentionally perfect quake 2 style airstrafing is from a game design perspective. There's no limit to how fast you can go, it's purely dependent on your skill. You can choose to either overshoot the optimal angle and have reduced but consistent acceleration, or you can shoot for the perfect angle and risk undershooting it and getting nothing. Then, the more speed you get, the angles become more extreme and more precise.

[@chichechich99]

Incredible, incredible work! Can't wait to corner someone at a Christmas party to explain the intricacies of air straifing

[@shovelclaws]

i know my professor hates to see a zweek video walk in the room

[@DrakePHOSE]

For any of y'all who are worried that movement in de and 2016 are boring cus airstraifing is simpler, I assure you, it is not lmao. Also, omg I've been waiting for zweekypoo to talk about doom eternal for a year and I loved all 4 minutes of it.

[@redtaileddolphin1875]

I have never known what bunny hopping is I have literally been waiting years for this video thank you

[@redtaileddolphin1875]

Goddamn this is a good video, it’s exactly what I’ve wanted and I’m only 13 minutes in

[@BloockW]

4:06 yeah this is one of the best videos I have ever seen on KZbin, you are incredible.

[@tccraig]

This video is fantastic; I love how thoroughly it breaks down every unique implementation. The animations also help communicate very effectively. Lastly, 20:36 It's nice to see somebody else has heard of Cobalt!

you said early that "it was way more complex than you expected", and i was imagining something simple along "floating point cumulative errors mounting over many frames" (due to weird jumps in Q3 only being possible at 300+ fps) but... wow... you were absolutely right.

[@h4724-q6j]

I know you made this with the full knowledge that you'd have to omit some things but I can't resist: Quake Champions (and Quake Live if you use some console variables) does have another form of air strafing that has air control like Quake 1, but also lets you gain speed in a straight line with approximately the same technique as Quake 3? It's very weird, I remember hearing it gives different amounts of speed depending on the direction keys. It originates in the CPMA mod for Quake 3, and I'm sure there are subtle differences even between the three mentioned. Doom 3 doesn't use the Quake 3 engine, it's its own engine that nonetheless has movement that works like Quake 3 (but with a _much_ lower basic running speed). Small nitpick though, and doesn't really change the point you making. Another niche but interesting variation is found in Wolfenstein: Enemy Territory, from Splash Damage, which uses the Quake 3 engine. They also attempted to fix the exploit with a really simple change - they just added a delay before you can jump again, so you wouldn't be able to avoid ground friction by jumping immediately, _except_ the delay starts when you first jump, not when you land. This means it doesn't apply if you're in the air for longer than usual, which functionally means that you can still strafe jump just like Quake 3, but only down-hill. Naturally, people have made trickjump maps that depend on this fact.

[@TarenGarond]

CPMA movement have Q3/Q2 like air movement when diagonal keys are pressed. Pressing just side keys have movement similar to Q1/QW air movement. Forward and backward presses have Q3 air movement but adding another step after called "air control". The first step of the air control execution is to calculate the dotProduct of your velocity vector(but normalized to a length of 1) and your wishdir, throw that value into a variable called "dot". Then calculate "aircontrol*dot*dot*frametime", then add that to your velocity vector in the direction of your wishdir. (the "aircontrol" variable is just a constant for adjusting the amount of aircontrol) After that you scale your velocity vector back to be the length of what it was before the aircontrol shenanigans... In this way you can by pressing forward or back turn in the air(without changing the speed) while looking close to the direction you are moving(or in the opposite direction in case of going backwards). The "dot*dot"(cube of dot) in the calculation does so that you quickly lose turning power when looking in more extreme angles from the direction you are moving(Limiting camera turning speed for good turning). I like to think of it kinda like the slip angle of the front wheels of a car, you steer a little bit and the steering works fine but with higher angles understeering starts to occur... It is quite weird indeed! Edit : By the way the "regular Q3 movement" is also modified so when your "currentspeed" is less than 0(You slow down) you have higher acceleration, so you can slow down in the air faster than normal...

[@InkboundWhimsy]

This is an incredible video. From someone that doesnt pay that much attention at speedrunning but still loves to hear about it, its so interesting to watch how runners feel about the different games

[@kkiil05]

You know a video about game speedtech is good, when within a couple of hours the top comments are from world-class speedrunners

[@skeleton_craftGaming]

6:50 the normalized [localized] safe variadic wide printf function ( vswprintf) is perfectly named ... What would you have named it something silly like norm_sprintf_va? How much writing do you expect me to do?

[@youraveragechroma2139]

Disappears for a year... Comes back with multiple times the production value. You're peak Zweek, you're peak.

[@lexihaiii]

ive been wanting to recreate sources character controller for a while now but ive been so intimidated by the concept of airstrafing, thank you for making this video! also this is some real quality content, explaining the (not-so) surprisingly complicated execution of "press left while look left, go left" in such depth, having it be *this* entertaining AND at times 3d animated? i have never subscribed faster in my life plus its under the hood source movement, how could i not be interested

[@celestialwaffle1491]

I'm not kidding when I say this is one of my favorite youtube videos of all time out of the literal billions made. I can tell why it took so long, every bit of effort shows. Genuinely, I dont think there's a single thing that could be better, it's all so insanely impressive. Now, go put those CoD games on a tax writeoff and relax. You've more than earned it.

[@taru3374]

Mistake noticed at13:20 ricochet isn't removed when you say "at least in the games you can't jump" because in ricochet you can't jump

[@DoctorSwellman]

Quake really is the grandfather of all FPS games. Wonderful video zweek, you've outdone yourself once again

[@dgundz]

yaw this video is super well done , you did such a great job explaining the history of airstrafing and how does it function on each version this just good

[@maxdmaxd-pc9se]

my brain have a hard time understanding but the arrows that shows velocity really helped. thx zweek. good to see your back

[@publickip]

love the editing style on this video holy sad you were working on it before Deadlock came out, was looking forward to that segment

[@Iteration456-8_codename_goblin]

Turns out the coding class I was forced to take even though it doesn’t apply to my major actually taught me something useful Good video, cured my 3rd degree burns

[@CashMayo]

this is the game mechanic video documentation that the world has always needed, thank u zweej

[@MemeFall]

No way! You finally released this! I remeber how hard you worked on all of those 3D animations on your streams!

[@NewyyTV]

I’ve waited a whole entire year for air strafe let’s GOOOO❤❤❤❤

[@GermanMR]

I love the experience of: who is this guy? why am I subscribed to him? [Watches video] So that is why, huh.

[@Sway___SD]

my day has been made and my excitement is unmeasurable

[@Wilker_uwu]

i am a creature of hardly grasping math. after playing around with Geogebra and countless other stuff in my gamedev journey, you game me the one visualization that finally made me understand what a dot product is. thank you.

[@poptre67]

this is a really great video!! so easy to understand and in depth!! I always liked to think of air strafing as taking what would be centrifugal force and having that push you forward rather than the direction you have already been going, but its so interesting seeing that its just a *little* more complicated than that. also, I loved that the video style is a combination of those well thought out video game essays and technically beautiful mathematics videos. as a schmoovement enthusiast, thank you for making this video. p.s. i love the pikuniku music throughout the video too

[@Zshutt]

lets goooooo more knowledge drops from zweek

[@dysonjb688]

just discovered this channel. i am genuinely obsessed with the animation and the movements so satisfying. hoping you get huge success in your future

[@Linkswords7103]

Awesome animations. Always happy when a new video drops

[@cherrycurry404]

8:12 Disliking, Unsubscribing, Burning your house down. You must be a vim user

[@osukarui]

Wow, this video is so beautiful! Love your graphics and blender work!

[@Quellems]

I started Zweeking when I saw this notification

[@youraveragechroma2139]

35:42 Now I am extremely curious for Cold war zombies potential quirks. Though, the game mode features a crap ton of "fixed control" movement tools...

[@YunginTV]

“A silly little video” just that intro was hurting my brain😂 your editing is fire and your scene set up is dope and creative

[@Benetheburrito]

Great explanation! Its super clear you put a lot of effort into the small details of this video and I wanted to let you know that its appreciated.

[@dabiga2315]

I don't know anything about programming and barely understood this, but it was interesting nonetheless. Could you do a breakdown of movement in other engines, like Unreal and Unity?

[@iamsixsyllables9679]

holy balls, this is some sweet and smooth animation! I've known the general math and have a pretty good understanding of airstrafe for a long time, but I was blown away by the depth of knowledge in this video, very clear that a lot of time was put into it. I've surrounded my gameplay with quake and source movement for YEARS, and know too much that I shouldn't. It's such a vast world that I've spent probably over a 1000 hours across Quake 1/2, TF2, CS:S, and CS:GO. There's so much to do.

[@rebane2001]

this video is put together so well, love it!

[@St2ele]

This is one of the best videos I’ve seen on the platform. I love the use of multi media, and great editing skills. Looking forward to your next one, Keep up the fantastic work zweek!

[@LordFluffy]

banger video i understood about 40% of it so i'll rewatch it 2 more times to get the other 60%

[@Blutankalpha]

BRO WAKE UP ZWEEK DROPPED A BANGER WHILE I WAS ASLEEP

[@FileTh1rt3en]

Your animations are very clean and they have a ton of juice. It's impressive how much quality you got packed into this video.

[@CAITAnCh]

The discussion about how airstrafing works in the later games was really interesting, especially since I was working on a game prototype that took inspiration from Titanfall 2. My very first attempt at doing an air acceleration function actually looked suspiciously similar to that original "cut" version from QIII. What I ended up settling on was also somewhat similar to what you theorized might have been the change in later games, but with a funny little hack to allow Source-esque strafing to (kind of) work: it simply directly accelerates in the wish direction no matter what, but then re-caps the new speed to wishspeed or current speed, whichever is bigger.

[@foudesfilms]

I love these movement mechanics videos. I have a defense for the variable name "current speed" at 4:00 that might make the Quake 1 code a little more interpretable. Calculating the dot product between your current velocity and wish velocity (with length one) does in fact return your current speed _in the desired direction_. So if your current velocity is straight forward and your wish velocity is 90 degrees left or right, you are in fact moving with a speed of 0 relative to your desired direction. If your current velocity and wish velocity are less than 90 degrees apart, some of your current speed is going towards your desired direction (as measured by the dot product). Etc. This helped me make sense of the rest of the code in this section, hope it helps others too.

[@Splarkszter]

This video combines all the awesome aspects and fun of 3Blue1Brown + Funke + Noodle + decino This video es peak art and peak Educational Entertainment. I LOVE IT. Thank you so much 😭

[@theleoshowm3010]

4:10 3blue1brown??? hmmmmm

[@iFloxy]

Wow, this is very well made!! Some very high quality work -- on par or surpasses lemmino, 3blue, etc.. well done!

[@sykstusgorbaczov8237]

wow the production value went up a BIT good job :D also love the haircut very cute :*

[@HDQuakelive]

Wow amazing production quality, good work!

[@MoonyB]

Wake up new peak just dropped

[@theooooot9469]

Zweek you really do make some of the highest quality content on this platform. Great visuals, great explanation. Love all the effort you put into these relatively niche topics.

[@phoenixsr_]

I love the 3b1b reference :D That was really awesome, such a well-made video!

[@drgabi18]

19:02 You can use -novr to play the game without a headset and, surprise, since the majority of the code is ported from Source 1, ABH exists in HL:A too (well, I know it existed in the Day Zero manifest, idk if it ever got patched)

[@sonicobg1]

as a person that has added quake movement to a game by translating and modifying code, this is a great video for the general public! amazing job!

[@ianmoore5502]

incredibly compelling editing. subbed.

[@crossway18]

It took this man 1 yr of death of come back with this banger, love the animations dude looks so sick!!!

[@red-v8m4u]

This video is a masterpiece: animation, reference to 3b1b, cool explanation. Everything about this video is perfect.

[@sam-sr9yp]

Amazing video, explains the technical side of air strafing really well. Also love the animation in this, reminds me of funke's videos :)

[@DeadOfMind]

This video was so informative i went to check out your other vids, guess i watched your last one and forgot to sub so what a lucky coincidence!

[@alexlowe2054]

I cackled at the 3 blue 1 brown music when it popped up.

[@Icecreamman571]

Me when the air strafing is actually complicated

[@apppples]

been awhile since i had to unfullscreen a video to click subscribe within a minute of starting it. good on ya

[@SuperGamersgames]

6:50 But it was me stDIO.h! :P

[@calestinekogami]

wait hold on this is some S tier content how have I not seen you before, instant sub frrrr

[@bulasturubula3660]

i absolutly love your presentation

[@instnct741]

you are way to underrated, the quality and amount of work that goes into this is insane!

[@SlavicEgg]

For 4 thousand years we have waited, and this bro finaly made a banger. with animation parts too, crazy.

[@nexs4n]

Love the production on this sm

[@danmur15]

clicked for the interesting topic, was intrigued by the opening animation, and laughing by the 2 minute mark. this is gonna be a good one.

[@thiagohenrique8913]

how can a 37 minutes video have this quality and information density, this is amazing

[@eladnlg]

ABSOLUTE CINEMA (iwatched all of it)

[@Chihiro_6079]

This is an insane amount of work. Awesome dude!

[@bance4678]

I’m a long time quake modder and player and it’s very clear you did your homework on this video. Well made!

[@LotsOfS]

I've always wondered what the hell I was actually doing when bhopping in Portal 2. Knowing what causes the loss of control when going too fast, and learning that it is based on WORLD VECTORS, is a nice added bonus too. Great video.

[@NoSleepDaChimney]

There was a old titan fall 2 hopping guide that went super in depth on why it occurs in game engines and how it occurs super interesting wish I could find it again

[@Andybananas]

if you ever plan on revisiting airstrafing for a video, i would highly recommend Warfork. Warfork has a nice mix of bunnyhopping and strafejumping where you can seamlessly swap between the two, and where bunnyhopping gives you lots of aircontrol but not as much speed, while strafejumping gives you an incredible amount of speed but with barely any aircontrol.

[@prgnify]

As an old bum who knew the first two parts of the video simply because I was there when the deep magic was written, you now have convinced me to give a chance to those two CoD games - I haven't ever played a single CoD (except the first one, at release). But now you have my interest.

[@ItsJoeyG]

Love the 3b1b reference in the little manim animated section. And that transition was fire!!

[@matsRLS]

watching this come to reality was the coolest thing ever great video zweek

[@mvttFPS]

bhop messiah has come to enlighten us, genuinely goated for dropping this hidden knowledge on us. after being involved with cs and movement for over a decade, this is by far the best understanding of the mechanics i've ever had. obviously knowledge about the quake engine and relevant functions has been here for a while, but this level of detail, understanding, and explanation is legendary.

[@Tankfird]

Great visuals and explanations (love the 3b1b reference), if anyone's curious about supplementing their understanding on top of what's in this video, I would recommend checking out matherunner's Half-Life Physics Reference. It's fairly expansive, going from engine stuff like frametime and player inputs to case studies of strafing and arguing optimality of the maximum acceleration. Obviously geared towards half-life but as shown still relevant.

[@e________v]

Wow, what a phenomenal breakdown! Much appreciate the inclusion of Quake 3 in the discussion; its speed tech tends to go overlooked these days. A thought on the origins of the Doom 2016/Eternal air movement: there’s an alternative movement type for Quake 3 called CPM, whose air control works very similarly to the Doom reboots, but with Quake 3 acceleration intact. While it was originally a player-created mod, it was officially added to the game and given a toggle setting in Quake Live. I’m not sure of the mathematical details of CPM’s air control (it may well be related to the function you were talking about), but it might also be a plausible ancestor to the Doom reboots’ movement.