Everything you Never Wanted to know about Smokes 

I honestly just have to laugh even time you use the piece of music deemed "annoying" by a bunch of people (1:02), and every time it seems to get slightly louder. I love it

3kliksphilip is now a smoking expert.

Every time 3kliks drops an F bomb, I feel like I've just listened to something that's forbidden.

I played with Phil for years in 2008/9/10 on css. Good guy, talented player. Fun times.

I am always so impressed at the writing of these videos. So much went into just the first 45 seconds of the script and I respect it

I just missed exactly THIS type of your content. Experimenting with the engine and finding game limits

I'm sure the CS2 devs love watching 3kliksphilip's videos appreciating every detail they made

Caboosing has turned into the ultimate inside joke here. Have to chuckle every time you use it :)

1:13 I am so not used to hearing you swear it actually startled me

Honestly, the music (at 1:02 and 2:02) and the feeling of your videos evokes proper nostalgia in me about the times I played 1.6 and Source. I would have never thought that I experience it thanks to a youtube channel but I am thankful for you for bringing back memories and the bittersweet feeling of my counter strike past. ♥

The fog on the floor from a grenade beneath it does give me a cool visual idea for a map. Not sure HOW viable it is to create. Simply have the map spawn, on a regular basis, a smoke grenade (or two, or four, depending on the area) to cover the ground in fog where one may expect fog to be. Say, a nightclub, or just being a cheap fake cold fog in a walk-in-fridge.

for the hard limits on the size of the smoke; the tech that valve uses is probably different, but it's extremely common for fluid simulations to have a bounded size for optimization reasons. I'd guess that Valve chose a size that would be large enough for most cases, but wouldn't affect performance too much. those sorts of compromises are really important from an optimization perspective.

Very cool to see Acerola getting credits for his incredible works!

As another commenter pointed out, the car in Tenet was also inverted, and is likely to be the same car seen inside the Red Room during the interrogation scene. Many people get caught up on the physical impossibility of what they’re seeing in that movie, when really it’s all to do with perspective - everything behaves the way it should according to which direction of time it’s following. Of course, there is some more advanced Tenet theory, like how inverted damage can slowly “appear” on uninverted objects (“pissing in the wind”), or how inverted bullets kill people via “inverse radiation” (yeah nah, Chris purely needed a plot device with that one), but for the most part, Tenet can be best be understood with a rewind button (and maybe a pen and paper). I’m actually a bit of a Tenet enthusiast, and my recent foray into Counter-Strike has left me wondering if there was any fan-made overlap - after all, the opening scene of Tenet involves Terrorists planting a bomb, Counter-Terrorists storming inside, an intense gunfight, and an attempt to defuse/reposition the explosives. In my opinion, that Opera house almost begging to be adapted into a CS map. I can already imagine exciting gunplay taking place in the curved halls, upper rooms, and backstage tunnels underneath. Unfortunately, my experience both as a map designer & modeller is zero, however I would absolutely consider learning if I think I could make a decent result. Overall, I loved how delightfully puzzled I was during Tenet, grasping enough clues to understand broadly what was going on but ever-curious about the finer intricacies of the time-reversal technology. As a film all about palindromes (see “Rotas square”), the only thing I was hoping was for the finale to revisit the Opera siege at the beginning, both revealing the answers I had about the chaotic opening scene and completing the film’s palindromic structure. But instead of doing that, we go to a completely different location? Granted, it was an incredible set piece, but was an utterly missed opportunity to ensure the film, like its title, had a palindromic structure. Nolan plz fix.

I liked the quick tic tac toe reference 3:30, im subscribing

god i love the 1:01 sound. oh man. i watch your videos in part because i wanna hear it in the most unexpected moment possible. like a horror game. but i have no fear. i bask in this audio.

I have a feeling that the clouds go further in confined space, because the smokes have a set number of those voxels they have to generate before stopping. So in a normal setting the bomb just creates a sphere and if something prevents it from being a sphere,more voxels are added elsewhere.

3:30 As a game developer, I can definitely confirm that is NOT happening in the case of the smokes. Any time you have volumetric stuff that relies on voxels, they are already pre-baked into the level's geometry. It is way too expensive to calculate voxels, and apply them in real time. To keep the game performant, they have to be pre-computed. In this case, it might be the distance formula is giving different results from the smoke grenade making it start on a new voxel, rather than shifting the voxels themselves. The start does make a lot more change than you would think, especially when you have special cases for the tails of trails. The voxels will be systematically toggled on through A* pathfinding which will cause different results even one or two voxels off. Also, A* pathfinding would be a nightmare on freshly created voxels, because you have to do so many collision checks to see if a voxel should be solid or not. Collision checks can be very expensive when added up. In regards to the smokes sometimes going out one of two of the holes, Valve probably has a special condition for if a majority of the inner voxels are close to an exit, it will continue marching from the hole, rather than the center to better represent certain edge cases. For corridors narrow enough, two voxels culd fill the area, and in that case, both will say: "I have a wall, don't propegate here". Also, I believe smokes will propegate farther if they are overlaid on top of each othr

0:01 LOL CS:CZ hostages make that sound when they there's shooting nearby. I like when sounds from olders games are present on later "sequels".

Hey Philip, thank you for the joy you have given me all these years! I have watched most of your videos with adblocker, and pirated many flac files of your music... I know this small amount of money that I have is way less than the value you have provided me, but please take this as my means of appreciation for your work!

i was going to search a comparison video between premiere pro and davinci resolve, then I saw kliks upload, and I get distracted, curse you kliks for being the most interesting cs and life philosophy youtuber

6:22 this makes sense, since when the glass is broken the gas is not under much pressure thus not extending that far.

As a heavy smoker, this video is very misleading, and I am very disappointed. God I need a ciggerete

Love these in depth videos about how Counterstrike works! Love how you explained how the voxels might work.

lmao the EXTRA LOUD caboosing

I don't play Counter-Strike, and I've never played Counter-Strike, but it's always very fun and interesting to hear you explore the design of the game and do tests and discuss something of what it means to the players. Not sure why I decided to pick this one to chime in and say that you make really good videos, but I did, so yeah, you do, good work :)

did philip saying fuck startle anyone else?

i think the thin gap between walls edge case shows that the voxels first look for the closest "exit" and bias their plume in that direction similar to water following the path of least resistance. This could explain the earlier example of the thin tunnel with holes either end which varied which side it went out of or (when neither exit was found) expanded to fill only the tunnel only.

Man I really appreciate that you look into these issues. A lot of the time, in a quest for making a general and reusable solution for a game mechanic, a lot of use cases (fringe cases) are ignored which at times lead to issues that you showed us. Game development is really tough and time consuming.

I love these over the top mechanics analysis videos probably my favorites

The way you ABUSE caboosing recently is amazing

Always appreciate your research into game mechanics videos Philip. So interesting to see the ways of the smoke and possible explanations.

i just want to let you know that i really appreciate that you upload in 4k, so that i can watch in almost native resolution as a 1440p user. thanks homie

Highly recommend Acerola's channel as well. Really informative and well-explained videos.

Thanks philip, this is the deepest technical dive into smokes done yet.

I have no earthly idea why I laughed to the point my stomach hurts when tic tac toe just showed up 3:37

7:37 wasnt expecting a lesson in quantum physics but here we are

Great to hear Sax Offender in your videos, can't wait to hear more!

Oh, "Top 10 GPU Tech-demos", such a comforting, cozy video... maybe it was the way you talked, back then? Regardless, it's almost 10 years old... damn.

One of the best of videos in a whle imo, Philip is as thorough in his investigation and "science", as he's brilliant at explaining it. I also think I caught a whiff of a reference. Anyways, I hope your videos get more recognition once AI becomes sentient.

Philip's doing Valve's QA job again. Great content. Good to see you mentioned Acerola, love his videos. Also smoke acting like waves and particles at the same time based on observartion is really quantum phyics like haha.

I’ve only played CS for ~5 hrs in the past 7 years but these mythbusters style experiment and exploration videos of the game’s systems are thoroughly enjoyable for me.

I just watched tenet this past week and its nice to you that you too were puzzled. I can't comprehend how there is free will if the singular timeline must be maintained. Anyways- great video, love hearing the new music

Well, that was an incredible video as always. Start to finish! :)

Phillip i like your approach in life. This is not an attempt to suck up to you, but i feel you have the spirit of a scientist : You see a phenomenon in the world and you desperately want to learn how it works. The curiosity of course is one aspect, how you approach the subject is totally in line with the scientific approach and you don't come into false conclusions if you're not sure about something. Love that way of thinking. Of course someone would say "you're doing so for things that just don't matter", but as Alexandra Drennan said in Talos Principle "we're here and it matters to us"! Thanks man! And Happy New Year!

7:24 I think it's more a technical limitation/simplicity than a safeguard against abuse. I assume they create a grid of voxels with a specific size when the smoke goes off and then do stuff within that grid. Being able to expand the smoke out by an arbitrary distance (changing the size of the voxel grid) would require more complexity and would probably decrease performance too.

I noticed you're using audio crime 2 in this vid, nice

i really enjoy rewatching all of your videos and listening to your ost because since cs2 launched i'm only using your music kit. it's very fun because it looks like you're coping me, taking the songs I know to be on your videos. you owe me a pronouncement about that. i paid for the music kit.

Your Tic-Tac-Toe reference helped me focus on the video again. This method, I think, can fix attention-deficit students.

CONGRATS PHILIP !!!! Many years w8ing for this and I hope you'll keep making videos for many years to come xD

7:43 Every time I watch it I'll have that moment where I'm like "OHHH I GET IT" and then I think about it a bit longer and realize that it still doesn't make sense.

amazing video as always! thank you!

Il love the music, and love the videos. Keep being who you are, we'll be there for you Phil

Great Tenet rant. I needed this.

This is on another level you are gifted and necessary to this community ❤

brilliant video. I liked the Casimir effect reference. (if that's what you were going for with the ever decreasing volumes)

I’ve missed this type of vid. I was hoping for the revival of these vids in cs2. Finally it has begun.

I like hearing some new of your/your dads music in your vids :)

The wave-particle duality comparisons gave me a chuckle.

this was a chaotic video Philip. the Minecraft and F bomb and caboosing jumpscare BWAHHHHHHWAHHHHH and the layer ontrol lip and the tenet complaint...

I really appreciate the ingenuity of the thumbnail, you really nailed it again 👌

I love bow philllllip can put in a few jokes throughout any video and they make me laugh harder then any other video I saw that day

man ur videos feel so special i dont know how

man always cool ass videos philip

congratulations on that very precise videotitle

bruh how this not get more views, its a banger

Super interesting video man, thanks you

Great video! Thanks Phil

Hey dude, thanks for the sick content, hope you have a nice day :D

This intro just spooked me becuase me and my friend were just talking about how light acts as a wave and a particle at the same time (we were talking about the photoelectric effect)

bro's turned caboosing into a jumpscare at this point 😭

This is the best start to a video ever

I'm curious if there's a parameter in the engine which makes it possible to change the size of the smoke particle "voxels", I'm assuming they're at a fixed size for the sake of performance, but I can't imagine they didn't experiment with smaller and bigger voxels. I'm not sure how readily accessible such parameters are, perhaps there are simple console commands for it, or we'll have to wait for S2SDK, worth digging into perhaps?

I would've expected (or they way I would've tried doing it) is to have some kind of voxel count that the smoke will get to if it can, and if you constrict it on one axis it would just use more of the other axes using path finding

You got rewarded by hltv today and youtube recommand you too me this very day, funny. Congrats to you

Great breakdown Phil

Love where you're going with this. I'd also like to see sprays act more physically natural when one spray appears across multiple surface types. Lower priority but Valve, please fix.

Great video phil!

2:19 that is SO reminiscent of old zombie plague maps in 1.6...

great video simply brilliant

That ground texture looked nice!

I LOVE CABOOSING I LOVE THE TRAIN SOUND YYEEEEAHHHHH YEEEESSSSS ITS SO ICONOIC AND DISTINCT TO YOUR CHANNEL YESSSSSS MOOOOOOOOOOOOOORE ;DDD ;DDD :DD

Looks like if the space is smaller than the voxels, the voxels are moved to the nearest sufficiently big space.

FOGgotten, SHOUDed, MISTery You really outdid yourself with this one Philip!

the tic-tac-toe gag rly got me :D

Tennet reference that movie was so damn crazy

please bring back captions! great video btw :)

I always like your CC, hope that it will come back because I'm not native speaker.

As someone who only played the original CS and now is on CS2, I'm very happy with all the changes

The car in Tenet is also reversed. Otherwise, you couldn’t even drive it. It could be the same car as the one in in the red room. Video breakdown from the channel Welby coffeeSpill shows that

man his pun game is on another level

That thumbnail is oscar worthy. The chicken deserves an award.

I think part of the explanation for the glass tube test was that the smoke was trying to spread, saw that the tube was already full, then spread out from the nearest exit. That'd also explain most of the "inconsistent" behavior in that specific test- makes sense that each time it chose a different exit, it was the nearest one. The later tests seem to confirm they have some amount of volume to them that wants to fill space until it's depleted. I think that's awesome, actually. Those parts of the video were by far the most interesting to me.

Hearing Philip say fuck will never not catch me off-guard, it's too funny

Love to hear some Audio Crime 2 in this video!

I have notifications on for only a handful of my subscriptions but yet your videos always slip through the cracks. Have to manually check your channel to look for new vids

Somewhere at Valve there's an employee grinning from ear to ear right now.

I haven't even watched the video yet, but I just wanna say that this is an amazing thumbnail!

The smoke bodies merge, then expand in the direction of the nearest volume of space that isn't populated, modulo any floating point errors. Not inconsistent at all - it's a fluid simulation.

love that first song, couldnt tell you why, but very appealing to my brain