Explosions

[@michaeldonoghue9015]

As a software engineer by trade, I could not even imagine someone making videos about my source code 30 years later and going into detail about how I decided to implement some function or round a result. Can you imagine? Speaks for how influential it’s been for the world. Truly an exceedingly rare thing.

[@mathprodigy]

💯agree, hence why Doom was indeed so revolutionary and groundbreaking

[@deadfishy666]

The only reason people can talk about Doom's code is because it's open source. To a lot of programmers this phrase is like kryptonite because they would rather have their stuff closed. So I doubt it'd happen in most cases.

[@gunswinger3110]

@@deadfishy666 shame that not a lot of games have their sourcecode made open source. Hell, nowadays games don't usually come with actual powerful modding tools anymore like map editors and SDKs.

[@ErebuBat]

Yeah Carmack was adamant about being open and supportive, even threatening to quit over it. Can you imagine if something like DWANGO happened today? For those who don’t know: DWANGO was a system in which you could do matchmaking / multiplayer in doom before the internet. IIRC they did this by tricking doom into thinking that DWANGO was a modem so doom didn’t know any better but DWANGO could route your game traffic to the correct place. The company that made the game would freak the hell out and sue the people for hacking and reverse engineering. Whereas “back in the day” the iD guys thought it was the coolest thing ever.

[@Manavine]

@@ErebuBat Actually, we did get something like DWANGO, it was called Slippi. Since it was an old game, they didn't care, at first. But the moment it became the online option for a tourney, they acted basically immeditately to nuke it and accuse it of "encouraging piracy"

[@rebca_]

Babe, wake up, a new yellow background Decino video just dropped.

[@knucklesfan463]

ahem, decino

[@GProgress]

@@knucklesfan463 ducino*

[@Ben_5917]

Yes, honey.

[@noidTV]

@@Iliek *Ducino.

[@IDHLEB]

@@noidTV dunkaccino

[@NML666]

Those zombies exploding in a square was a work of art.

[@eebu4053]

asposion

[@MirekWdowiak]

Squareplosion ! :)

[@inffr88]

Pew pew pew and kaboom >:) Entire doom plot in 5 words

[@bigbruhtheorphan9070]

zombieplosion!

[@thebritiannicscribian991]

500th like

[@BeengusKhan]

That Archie on the thumbnail honestly looks like he's chilling over a bonfire

[@iguana9173]

Yes definitely.

[@thatstockimageguy1067]

you mean a *bomb fire*

[@Valhalla_Heathen]

He’s warming up his hands 😁

[@23Scadu]

That's it, a bonfire, that's why the enemies come back to life!

[@tovrobi5097]

The only thing is - the bonfire is the player's corpse.

[@KrinkelsNG]

Totally had fun watching this. Quality stuff.

[@abdullahh_04]

Krinkels? What are you doing here? I didn't know you were a doom fan.

[@pitysquid]

No way it’s Krinkels

[@nbanextlegend7497]

OMG IT'S THE MADNESS MAN

[@nbanextlegend7497]

@@abdullahh_04 He's a big fan of boomer shooters,I watched him playing Dusk in a stream once

[@pitysquid]

@@abdullahh_04 that explains a lot actually

[@EHZD]

Doom logic: if you don't see the explosion, it doesn't exist

[@marzi_kat]

If a tree falls in the forest and there's no one to be hit, does it deal any damage?

[@xanniest]

@@marzi_kat Depends on the blockmap

[@basedcringechad5640]

I've never seen an explosion. I've also never been blown up. Just saying.

[@CaveyMoth]

Doom Explosion is not visible. Doom Explosion cannot hurt you.

[@TheReaverOfDarkness]

Doom Logic: If you can SEE the BFG hit, then any enemies you can SEE also get hit.

[@GB_256]

It’s amazing that John Carmack and id’s team was able to program all of this in just barely a year.

[@discoRyne]

Diet coke is one helluva drug

[@DinnerForkTongue]

@@local538 And chocolate.

[@SpongeBobaFett]

@Quadsword I was just gonna say that. John Carmack is on another level of smartness. We were just fortunate enough that he used his intellect to create an epic computer game, out of all the programming paths he could've followed. Maybe this isn't the darkest timeline after all.

[@Plague_Potato]

@Quadsword You mean Part-time astrophysicist and our only insurance against their overwhelming alien incursion John Carmack?

[@akeustis]

Might explain why there's so much jank and bugs though. From a software engineering perspective this is what's euphemistically known as "legacy code", i.e. code that kinda sorta works most of the time but God forbid you ever need to change something or understand something.

[@Wavy667_]

Fun fact: Explosions in Jaguar console ports can penetrate through walls, making them overpowered against things like monster closets.

[@jacryan2626]

But as Caddy said: "We dont talk about the Jaguar."

[@TheBreakingBenny]

@@jacryan2626 We can talk about its source code, though!

[@Nihilistic-Mystic]

@@jacryan2626 CHAPTER 6: WE DON'T TALK ABOUT THE JAGUAR *requim for jaguar intensifies*

[@NEZLeader]

@@jacryan2626 Jaguar version of DooM is easily the best console Port made by retro consoles (in terms of pure original vanilla ports, DooM PSX is the best version for consoles but is heavily altered, slowdown & gfx are pretty rough).

[@jacryan2626]

@@NEZLeader yeah sometimes the framerate would tank and some sprites would dissappear if there were too many enemies.

[@the1stwing]

decino: "A cube with infinite hight" Me: *cries in geometry*

[@theonlybilge]

Assume Euclidean geometry

[@The_Big_Jay]

Oh god, I just realized how screwy that is.

[@theonlybilge]

@@The_Big_Jay Same, I just realised that it's actually a rectangular prism

[@VaderTheWhite]

[Laughs in fthgan]

[@DeonGaming]

@@theonlybilge It's called a parallelepiped.

[@felynecomrade]

If DOOM were an officially recognised field of academic study, decino would undoubtedly be one of the foremost experts in the world. He'd be the one giving lectures and presentations as a DOOM professor with a DOOM doctorate.

[@heavenlyhavens]

I'd definitely pay to go to THAT college

[@Minnevan]

Doomology

[@heavenlyhavens]

@@Minnevan Perfection

[@bta8359]

Phdoom

[@lyrimetacurl0]

Even more than John Romero? 😂

[@kgorob]

Every square explosion is a masterful compromise of accuracy for faster calculation. It's ideal for the type of game Doom is - hectic fights, everyone moves around - you won't even notice.

[@CaveyMoth]

My mind is blown that explosions are square.

[@ErebuBat]

Exactly. It is technically “wrong” but in normal gameplay it isn’t even something that is an issue or is just attributed to luck. John Carmack was a master of these types of choices which lead this game being able to run on a 25Mhz processor. Truly amazing

[@Jesse-qy6ur]

@@ErebuBat I think that's a big part of what makes Doom technically interesting: processors were powerful enough to do the graphics compositing and basic AI, but weak enough that things like square root calculations for explosions and using a real PRNG for the shotgun were prohibitively expensive. All games are first and foremost products of the hardware at the time, but Doom sits right before the hockey-stick growth of consumer-grade CPU power really got going with the Pentium and the PowerPC in 1994.

[@Alloveck]

Shocking twist: Doomguy's canonical reason for being the sole person who can stand against the forces of Hell is that he's secretly the only in-game person who understands his world as well as Decino.

[@makhauser42]

decino: publishes a video called "Explosions" Dienst Speciale Interventies: Oh, don't mind us, move on

[@sirel33]

I spent a solid minute rereading those first three words in the second line I wanna be a speciale interventy too

[@Elmom_]

@@sirel33 It's Dutch. It means "Special Intervention Service".

[@Damian_1989]

What is that, the Dutch FBI?

[@CheesePotato]

@@Damian_1989 yes

[@HexagonalZebra]

@@Elmom_ Is Decino Dutch?

[@matriarch4882]

Literally just died to a rocket at the end of Eviternity Map 09 and ragequit to KZbin to find this

[@Quitting.Byeeeeee]

The Arch-vile in the thumbnail looks like he's approaching something insanely precious yet fragile.

[@Lugbzurg]

He's trying to pick up that bonfire.

[@Fuchsia_tude]

He's trying to Indian Jones swipe the barrel mid-explosion.

[@Quitting.Byeeeeee]

I'm really proud of those replies

[@markus-hermannkoch1740]

0:54 Once talked to a game developer. He told me his art is in making things as simple as humanly possible while still working. The Doom makers make a good case proving that point.

[@MopMcBingus]

this whole time i thought mancubi and revenants actually were explosive.

[@MrEvilbyte]

For the longest time I did too. Ditto for Barons and Heck Knights xD

[@iguana9173]

@@MrEvilbyte same here

[@macabweu7682]

I thought Imps had explosive projectiles once but it was cause I was following a projectile for fun. And it hit the wall and another imp who's sounds didn't play had fired a projectile at me that low rolled damage.

[@CallofDutyBlackOps28]

i think their idea was being a giant fireball, and it's "explosion" is the flames dissipating from it's represented area where it stops being a flaming ball.

[@Fuchsia_tude]

I knew revenants' weren't, but I think I thought mancubi's were.

[@alucardpg]

*Calls girlfriend* "Honey? I am going to be 13 minutes and 57 seconds late for our date."

[@iguana9173]

You did the right thing.

[@bappojujubes981]

You could just have her watch the video with you on the date.

[@bigbruhtheorphan9070]

babe, can you come over for 13 minutes and 57 seconds?

[@TheReaverOfDarkness]

Real women watch Decino with their significant other.

[@n00f]

I think you've had a single rocket Revenant kill once or twice in your playthroughs. Nice to know why. Also that outtro.

[@smergthedargon8974]

11:35 "Involving a lot of moth" The code runs by having a bunch of very tiny moths running around manually flipping 1s and 0s.

[@decino]

Well yeah, where do you think the term "bug" originates from?

[@qwertyram4598]

@@decino Funnily enough, it does originate from removing moths from a computer

[@hotpocketsat2am]

oh hey aren't you in the conlanging discord server

[@smergthedargon8974]

@@hotpocketsat2am I was - they banned me after I said scammers should die. No, I don't know why that's banworthy.

[@williamsmith666]

The PS1 ports of Doom and Final Doom have an interesting quirk with regard to explosions; in certain instances, you can fire a rocket where two solid walls converge into a 90 degree angle and its ensuing blast won't cause any damage to you.

[@n3onkn1ght]

The beautiful thing about _Doom_ is that it relies so heavily on RNG that you're never _quite_ sure if something is a bug or just a bad roll.

[@Leet-iz2fz]

I fell asleep listening to this and had a dream that Death from Discworld was showing me a version of this where you directly compared the damage and blast radius of Doom explosions to real-life bombs. The dream ended when a bomb landed near me, I sprinted away, and then the last thing I heard was "Ah yes, eleven thousand times more blast damage."

[@nilly0052]

Decino standing by in apathy as a someone get's vaporised by eleven thousand times the blast damage XD

[@Leet-iz2fz]

@@nilly0052bro narrated over my gib animation

[@The_Top_Hat_2]

that is hilarious edit: death-cino

[@lolxd1137]

0:13 "Pew Pew-pew and kaboom" -decino 2021

[@victoriqueMoe]

EPIC! That block map with the array list was really interesting! always keep your lists immutable when sending it off to other methods, boys :)

[@kgorob]

Or better yet, don't store them in some global variable, making implicit dependencies :)

[@Noromdiputs]

Pretty sure it's a linked list. Otherwise it wouldn't behave like that.

[@kgorob]

@@Noromdiputs It was a linked list, but you could easily mess up with any data structure if you are not careful. The same thing could happen if it was, say, just an array and elements would be suddenly rearranged in the middle of a "for" loop.

[@victoriqueMoe]

@@kgorob concurrent modifications are not a good friend

[@flex9663]

@@amnesicpachyderm turn it into tuple boi

[@majamystic256]

Mr. Torgue approves of this video

[@themiataisntahonda334]

E X P L O S I O N S ! !

[@-bemyvalentine-]

Ah, I knew I wasn't the only one who thought of him!

[@themiataisntahonda334]

@@-bemyvalentine- news flash, *you aren't*

[@BorisAnatolievich]

"I hope you had fun watching it too" decino is only person who can turn doom code researchments into such great little movies, so even a person like me, who is very far away from that is highly entertained. Thank you

[@clonefighter1996]

"Kaboom?" "Yes, Archie, kaboom." Main video sections: 0:00 Intro 0:26 How explosions work 2:35 Things that explode 4:17 Rockets 5:26 Explosive barrels 5:37 Arch-vile's attack 7:40 The blockmaps 8:54 Double damage 10:57 LoS code bugs 12:17 Outro

[@BigFaaayaaa]

You're on the verge of explaining the game to the very Devs mate, impressive :)

[@piip4]

Been playing doom since the mid 90s and never really had a break from it. It blows my mind that I could learn something new about it.

[@FelipeJaquez]

Next episode will be about how walls work and the code on how the engine makes the weird 2D - 3D

[@knucklesfan463]

Meanwhile, certain mr. Torgue has only one question: EXPLOSIONS?!?!

[@expendableround6186]

*EXPLOSIONS!*

[@coincident]

Great video. I've always wondered why I took no damage while face-rocketing myself again some walls... and now I know! Also loved seeing the analysis of the double-blast-damage rocket bug. I almost considered adding that subject to my blockmap bug video, but ended up cutting it out to not delay the release. Major props for digging into the code for this one decino; it looks like there's some mind-boggling spaghetti in there.

[@luckylooser2013]

"...I'm here to ask you one question, and one question only! EXPLOSIONS?!"

[@Metaretru]

Mr. Torgue is proud of this video

[@DOOMSlayer6476]

Decino always says the most interesting things about DOOM

[@iguana9173]

He sure does.

[@OzzyFoxMercury]

Your Doom analysis series gets credit for getting me interested in coding and sending me down this career path. Something so beautifully fascinating about the way it works, and you explain it in a way that intrigues instead of intimidates.

[@mjc0961]

That Slayer screenshot appearing while saying "no" 😂

[@odstagent1070]

Our favorite characters doing Jojo pose: 2:40 (?) It's a special feeling that you figure out things in Doom and then show us, like some kind of classroom

[@Soddarkryder]

Ah, yes, my favorite jojo pose: explosive barrel

[@ricegod7812]

Decino is the only Content creator that can hurt my brain with math and coding without boring me.

[@williamanstis]

search ranoeke gaming, theres another one

[@sanketower]

Decino: We're now going to talk about Blockmaps Coincident: *T R I G G E R E D*

[@521Undertaker]

The blast damage distance calculation uses the Chebyshev metric - en.wikipedia.org/wiki/Chebyshev_distance. It is perfectly reasonable for you to use the phrase “blast radius” because in this metric, circles are squares. Sorry for the edits. I couldn’t remember the name of the metric.

[@JDHerreraMusic]

Jazz Jackrabbit 2's music is a real touch of class...

[@bedrockcastle777]

my dopamine levels shoot up to 250% when I see a new yellow thumbnail

[@justanantico6327]

But then there's the moment when you see a yellow thumbnail, but its not by decino. One of the most tragic betrayals in history

[@bedrockcastle777]

@@justanantico6327 Oof, yeah that sucks

[@T-West]

3:26 I suppose Rockets are more appropriate for explosions than are Birds...

[@SamothIorio]

Did you know your rockets can deal more damage if you kill doomguy before the rocket impacts? Wait, wrong game nvm (I love seeing dedicated players of different playerbases mingle! Also, I'm eagerly waiting for the next light-blue thumbnail video!)

[@NelsonSKA]

Hahaha the doomguy-trick. Hi T-west!

[@jimsouch8632]

Is that an AoE II reference?

[@slayerd357]

I LOVE how Decino deconstructs EVERY aspect of this game. It's fascinating and impressive.

[@A_Lazy_Mutt]

You are becoming the Doom professor, ducino.

[@vittorioromeo1]

As a hobbyist game dev and long-time Doom fan I absolutely adore watching these videos.

[@Alt-Bayzel888]

I can tell this video is going to BLOW UP Aaahahahahahahaaaaa...... : I

[@bappojujubes981]

Don't change

[@mathprodigy]

I was in the line of sight. I took full damage.

[@alextcastillo1151]

Not even a pinky in nightmare mode is too fast as me coming to a new decino analysis video

[@42percenthealth]

Me: Explosions in Doom aren't that complicated. I probably already know everything that's going to be said in this video. Decino: Kills a revenant in one rocket Me: shocked Pikachu face

[@luizhenriquebraunermoraes3175]

The missile checking if it hit something at around 4:18 made me realize that every single game tick, each and every single projectile in flight asks "are we there yet?" until they're there yet.

[@jackulstrom9150]

That "No" was perfect

[@ominousvirus5278]

Remember when I said “I hope some day I’ll understand more of this.” Well I’ve gotten better! I’m now able to program pong in Java, so that’s progress :)

[@las4gna84]

*BOMBS, you want it? it's your my friend, as long as you have enough rubies*

[@abrahamlincoln9160]

Sorry Slayer, I don't give credit! Come back when you're a little MMMMMM richer

[@kroktal8896]

1:19 Actually it's a topological ball of infinity norm, or as non-nerds call it, a square. I think the reason it was done that way is to avoid to compute square roots. John Carmack will later find a fast approximation for square roots for Quake

[@DrGiggleTouch67]

That clip at the beginning is so funny to me and I can’t explain why.

[@legoseed2389]

I had fun learning about explosions

[@anthonyflorez1316]

Be

[@Sheevlord]

I love these deep dives into how certain game mechanics work. The code analysis parts are my personal favorites - they show how things can go wrong, and how hard it can be to track down certain bugs. As a software developer myself I appreciate your efforts.

[@Mintor94]

It took me a while to realise that there's Jazz Jackrabbit music in the background

[@ClassicDOOM]

Info-taining as always. :) And thanks for the shoutout; glad the content was useful. If you're interested in a similar example of the bug at 11:42, at the bottom of the channel's home page is a "Sewers and Betray" playlist, and at the bottom of that list is video showing some close-packed barrels in Betray that explode without damaging others next to them. Anyway, keep up the great work. Cheers!

[@loknito5764]

Story line Its 2 and 17 am Decino: Uploads a video aboit doom explosionsp My eyes: tomorow My brain:WATCH THAT AMMO BOX OF 2919392 LINES OF C++ CODE FOOL

[@darkowl9]

I could listen to decino explain obscure Doom mechanics and interesting quirks all day long. Another insightful masterpiece!

[@ubermikesocal]

02:51 In case you ever wondered, the Arch Vile is indeed throwing a Hadouken from Hell at you. John Carmack must have been a Street Fighter 2 fan

[@mondragon9282]

These videos are so fun to watch. I love learning about how things work. Bonus because it's DOOM.

[@smugbowkid9919]

Cursed Doom moments: That rocket damage on Revenant and Mancubus.

[@eduardodiaz9942]

Extremely minor nitpick: if a cube doesn't have equal width, height and depth, then it's not a cube, it's a prism. But yeah, very informative, as always. And watching zombiemen getting blown to pieces is always fun.

[@a1s972]

Sweet! Good to see u looking deeper into that line of sight thing Ive been curious about that for a while

[@Ben-ix8yb]

Had massive fun watching it. Thanks!

[@darken2185]

Great video as always! I'd love if you talked about the Nightmare difficulty on Co-op on the console version of Doom 1 and 2. It's absolutely insane and it can be considered a difficulty above Nightmare

[@underwatergremlin]

"You can increase the blast damage even more, all the way up to 128. How? Just blow yourself up lmao." I love that line.

[@justarandomdudeontheintern2739]

Dude Decino sounds so excited in the beginning

[@Ferdam]

decino, your work is amazing. I love how you dive deep into mechanics and technical stuff to uncover the reasons on why so many things happen in the game. Congrats, very unique videos you make

[@edgeofspace8655]

Easily my favorite doom content on the internet. I can see how much effort you put into these. Keep it up man.

[@jb_lofi]

Obligatory HUGE thank you for considering people with hearing issues and putting in proper subtitles.

[@Blahalel]

wait omg this has subtitles? thanks decino

[@RandomizerYevhen]

1:24 - actually, rectangular cuboid (cube with infinite height is infinite in all directions).

[@peremoyaserra2749]

That square radious distance is called Manhattan Distance (for obvious reasons) amb it's used because it's way faster for the computer to calculate, square roots are quite expensive for computers.

[@xm214-aminigun9]

Meamwhile is another universe: Implosions

[@karlk5801]

We had Implosion at 0:09

[@hybridgaming8341]

It's crazy how some of this info is technically useful, but to actually pull it off in-game would be nearly impossible. Great video!

[@pixelcat29]

I feel like a nerd for still playing doom 2 Even in 2021 and to this day

[@AleksandarProkopec]

That you can kill a revenant with a single rocket because of what's essentially pointer aliasing is fascinating. Looking forward to that video with line-of-sight checks.

[@BennetCRadey]

You mentioned the Pythagorean Theorem, so you can technically mark the video as educational.

[@BennetCRadey]

@@local538 I mean you're not wrong

[@MakotoIchinose]

Thank goodness I watched Coincident's basic explanation of blockmap so I don't get distracted by "fake" floaty things in my eyes when watching decino's turbo nerd explanation. Also theory of relativity ;)

[@ademkapovskic8106]

Decino: *explains the intricate mathematical system behind explosions * Me: haha rocket go boom

[@quantumpanic]

Decino's breakdown of doom game mechanics only enriches my knowledge of game design/development

[@tomyyoung2624]

That "Yes" was perfect

[@NekoKhris]

Who needs sleep, decino upload is always more important

[@landoncore92]

YESSS START THE VIDEO WITH A SUNDER CLIP! I love you so much Decino!

[@CemessonderIII]

I see yellow, i get happy chemicals

[@julianolima3500]

These videos made me read Doom code in my downtime. Thanks a bunch for making them, Dec.

[@maltardraco9555]

It's so weird to see a Cyberdemon fire only 1 rocket and not 3.

[@tenhundredkills]

So, it's technically a blast perimeter, not a radius? That's cool!

[@MrJohnReviews]

This video was brought you by Michael Bay

[@DoomKid]

Watching a decino video and hearing a MIDI that Lippeth and I composed gives me great joy. Fantastic as usual!

[@doomgod1150]

Explosions are EPIC!!!!

[@a121189534]

FINALLY this video is out ive been waiting FOREVERRRR

[@gabr1elawesome]

0:58 "you would say this would be done using the pythagorean theorem," **shows TAG 2 ending** "But no" Good stuff

[@noeldc]

I am a simple man: I see a new decino video, I click; I see a new decino video with a yellow thumbnail, I click furiously until it starts.

[@YatzeeWillWearAGreenHat]

0:30 "Top view" , like the sprites indicate

[@fmsyntheses]

Your analysis videos are all treasures in their own unique ways.

[@tastybekonn]

title: explosions me: lol what's so complicated about that, count distance->deal damage wtf dude has no more good ideas for a movie me after 14 minutes: oh '-'