How Doom's Enemy AI Works 

Nice

Fantastic breakdown as usual. The reaction time is pretty neat to know about as well as what causes some enemies to be stuck

i am lucky that CacoDemons don't resapwn it would be a nightmare ( sorry if i accideantrly pronnounced "cacodemons" wrong i haven't played doom in ages tbh)

Gib>jib Gif>jif

To be fair is ok you forgot info so 1) we can still manage to understand the info and 2) we get to see another video of yours lol

Real shit indeed

Doomguy: shoots pistol Demons on the other side of the map: *ASCENDED*

@@kingd8232 lmao

someone needs to make a sprite for doom that replaces the punch with doomguy clapping really loud.

I like your party hat

@@comet-fy6pd *pain locked

Pro Tip: To defeat the Doomguy attack him until he dies,

Not a single person is aloud to like this comment anymore.

@@breakfast3006 for that i liked his comment

@@timbabcock4757 And that, together with the attention you gave them, is precisely what they wanted to happen.

R4ND0MCR4P123 he is lol

well yeah he is

Dude, why didn’t you just ASSUME that he was breaking the sound barrier when he punches? Do you have ANY idea what doomguy is?

Now I want a mod that changes the punch miss animation to a clap.

Probably why he can kill demons with his fist

Never played multiplayer FPS before?

but do odd dead enemies think?

Fuck you. You spoiled it.

@@portablerefrigerator4902 damn bro sorry to hear you got the doom AI spoiled for you. Really ruins the narrative.

@@portablerefrigerator4902 oh yeah worst spoiler ever... I mean come on dude this isnt a gameplay or a narrative video just a informative one about how the ai works

True

lol so true

Well, Doomguy can KO demons with a punch. With a swing that strong, I'm sure there's an air *whoosh*.

I charge at them when i have the berserk in Doom and Doom 2

its because the Punch and the Chainsaw are Hit scan weapons in the source code there just coded to only affect damage if your next to the Actors Hit box. Doom removed stealth in it's melee attacks as the Knife in Wolf 3d was Silent and that function for weapon slot 1 was retained in the Blake Stone games the combat knife was replaced with a ranged self recharging energy gun with normal range but kept the stealth function. it only failed if you did not kill the actor and the alert sound would wake up every one in the room without a Deaf Flag.

Imagine a Doom mode called "Algorithmic Doom": every demon stops to enunciate everything they are going to do before doing it.

"Take this Doomguy, my ultimate technique! Max Damage Roll Homing Missile!"

Here comes flame boi...

@Ll Dd coming right to me

@Yggdrasil Burnes beat the shit out of

Lmao

That brings the question of how the hell a caco would hardscope

@@GhostofFarta focusing its eye i guess

@@GhostofFarta A monocle, obviously

@@CT-1118 surley

It do be like that tho

lost soul: mimir

The lore of Doom: Kill things Kill more things Kill even more things Kill angels because they’re working with demons Kill eternal...ly.

@@thebiolibrary5572 And then at long last Kill guy who made all things

Get all weapons, pretty much kill god, and then something stronger, all while killing thousands of helpless demons.

Doom lore: YA KILL SHIT

@@thebiolibrary5572 And kill big cow man called the icon of sin.

"Okay, Doomguy, I'm gonna start slapping air like this, and, if you get hit, it's your OWN fault."

He's just swatting flies. Flies like skeletons.

@@DjTake1One tryin to clap them cheeks

@@DjTake1One best comment

Skeletons are always the silliest. "NYEH HEH IVE GOTCH YOU NOW HE-MAAN!"

he is coming

Gavrilo Princip LMAO 😂😂

Like that one fancy dude in Sarajevo.

Run boi

No You have chosen death I merely started the conflict

Doomguy: you fool, *I am death*

Now all of Hell knows you are here!

is there a reference I'm not getting

Pocari S yeah

Real

No.

@@breakfast3006 thx

Shiro: ''It's a trap!''

It was me, Doomguy!

When your wish of "dying" just reach a new level.

Jojo references

*Doomguy holding a super shotgun* "HOHO, I could say the same about you!" *BOOM*

Nah, he’s more into wolfenstein

Nah he’s into fallout

All of y’all are stupid he is clearly into cyberpunk 2077

Idiots. He plays Halo.

You fools, he enjoys the superior Barbie Salon Tour most.

this is why I listen to doom music during lectures, it makes me feel like I’m listening to decino and it helps me focus

Or 60 archviles.

*Typing of IDDQD at mach 10 speed intensifies*

Top coment god

@@Darknessblade4me lmao a pro gamer here

@@jestfullgremblim8002 You gotta draw the line somewhere. And mass revenant spam is mine.

Given the omissions in the official Unity source port, I actually think decino knows more about the internals of Doom that the current devs at id do.

The official source port that id Software uses for consoles and is bundled with Doom Eternal is made from scratch in Unity. There is more info in the Doom wiki here doomwiki.org/wiki/Doom_Classic_Unity_port

Carmack knows everything, EVERYTHING

@@doodguytheblank2403 Yeah but he's an interdimensional tech-warlock.

@@doodguytheblank2403 I dont think even carmack knew about archies making ghost monsters

JC has certainly earned being the target of all those super-genius-coder memes and then some!

I understand it was John Romero who coded all the interactive stuff from the engine. I'd like to know if he coded too the monsters and all the gameplay stuff (except for Status Bar and Automap which were made or finished by Dave Taylor), as the editing tools and the environment behavior are credited to Romero, and here also seems to be the case.

Benevolent hyperintelligent juvenile delinquent John carmack

Theres a reason why civvie gives jc those super long titles, John's an actual rocket scientist and in some other dimension an actual evil dictator that rules the world

@@bioman1hazard607 other dimension? For all we know, he just hasn't begun yet

friendly reminder that the source code for Doom 1 is actually really clean C. Just try to start modding and you'll become familiar.

Videos like this remind me of how incredible we humans have achieve when it comes to coding and video games as a whole, like really, look at all this work and all that. Suggestion, look up for "how does pokemon sprite work" that is insane too....

​@@cfdeers someone should hire that carmack dude, i think he might be pretty smart

@Agent 005 and hes working on AI.

@Agent 005 He did, but prioritizes AI now.

5.profit

*5. If on nightmare, respawn and attempt Atacc Doomguy again. *6. Repeat.

@@ej22_gc86 lmao

9. Constantly say Atlas it's what you meant to say attack.

LMAO

3. Pause, with anticipation. 4. 5. 6. 7. 8. 9. *ATTACK!*

@@clonefighter1996 yes

3. Go grab a beer, because you're a human and both the guy and the slayer have no problems with people.

@@wowalamoiz9489 doom guy and the slayer are the same person

@@ttty2242 They are from two different canons. Doom guy is a disgraced space marine from the original Doom series. He's a good guy but otherwise a normal but determined person. Doom slayer is from the new series, and he's very much not ordinary in any way.

Like which maps? Pardon me, I've just never noticed these.

@@acidwizzardbastard E1M9 "Military Base" in the original Doom (room with the Rocket Launcher) and Map 16 "Suburbs" in Doom II (big outdoor fight near the toxic waste lake) are two notable examples.

picture?

@@xt355 Military Base - The hole is in the top of the wall directly across from the stairs: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-fLzz51ReF20.html Suburbs - The hole is on the left, in the wall just below the ledge that leads to the toxic pit: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-FOcDWLTnk-s.html

Or in MAP01 of DooM II too, the secret closet with 2 imps and a stimpack had a hole in its top left corner leading all the way to the fenced but open closet with an imp on the right. That caused the sound to propagate from the main room, into the fenced closed, through the hole and into the secret.

I think doom 64 had vector environments

Faster than a Nightmare Fast Monsters Pinky

T U R B O P I N K Y

@@KeksimusMaximus i was gonna say hihg but i couldnt remember if it was high or hihg

Dark Lord:" ehhhhhh............. *the second one* "

well, your not wrong

fire from your ass if you were preoccupied previously with another target

Option 1 is just nuts3 wad lol

Yes. And if this was what 1990s code looked like, the 2020 stuff would be a lot more complicated!

This code is elegant in its simplicity. Having modded Quake 2 in the late 90s and then a bot to work with it, reverse engineering id's dense clean code was a breeze, I had zero prior experience with C++ and was able to get in there and figure out everything from the simple cluster nade mod to the server side and client side flows in days, with only a c++ syntax reference

First I thought that I would say that the code seen in this video is actually pretty elegant and easy to understand - for a programmer. Then it dawned upon me that anyone who already had experience in programming wouldn't make that statement anyway, so yeah :)

This is what makes Doom a masterpiece, and what kids, idiots and journalists don’t see behind its apparent simplicity. Many later bad shooters had crap AI, because their creators wasted all their time on graphics.

@@hannahgreb1482 it's more or less the same, you forget a bracket or semicolon somewhere and reality collapses in on itself.

Baron of Farts! :)

Me after coffee in morning :)

Pretty sure he bled a bit when "expelling" the projectile That's commitment if i've ever seen any

And it's green sooo....😆

Someone make a DOOM wad where all monsters that have projectiles fart them out.

me watching every educational video

Only if you have a bad attitude

@@BigboiiTone pretty sure that attitude has nothing to do with it If anything it depends on your interest in the topic

@@rompevuevitos222 interest is important, but coding experience helps a lot. i can't even imagine, how someone new to the topic could follow. this is basically video assisted C-code hypes me up for going through the source, though

@@BrauschN When you're intersted in something, you can put as much time into it without getting as worn out/bored as someone who doesn't really "dig it" Wich considering that indeed is REALLY hard to get into coding, it's really important

Bubblegum engine.

that is insane

Primitive, maybe, but you can't help but accept that a bunch of games did interactive justice with it, especially Blood.

@@IchigoMait Doom speedrunners want to argue with that. There is enough conditions in the code to make mobs semi-random at times.

@@IchigoMait while it is deterministic (demos just repeat player inputs afterall), there are so many calls to the rng array that doing something the same way twice is impossible for a human to actually do past the very first action they take. It's effectively random.

All thanks to the extradimensional being living in a cocoon named John Carmac

Honestly this is an understated point. I've played indie games with "simple AI" where all they did was instantly turn to the player and effectively "hold forward". I felt this to be very unfun to play against. This highlights a very basic yet super important point about AI: Fun has nothing to do with how simple or complex the AIs are, and game AIs should focus on being fun. Its okay that they're stupid, because they're stupid in a way that makes them fun to dispatch.

No. Damage is random. Things like pain states and Wether an enemy dies depends on the outcome ofrandom damage. Monster chase behaviour has some randomness. There is some random spread on some weapons. The player cannot see through pseudorandom numbers and know the state in real time. Pseudorandomness looks and feels like randomness.

Cringe yet funny

@Just David to be fair Rick and Morty is inherently cringe

@Just David rick and morty is awful and I can cringe at it just like you're allowed to like it

@@BigboiiTone hater

It's funny cus it's true. If you know how to logic this should be easy stuff, else it's just random words and letters... See what I did there ; )

As a janitorial engineer, I agree.

But of course, that map's a masterpiece.

Correct

Fan fact: Anagnorisis means recognition in Greek. Now let's see if this has anything to do with the map

@@toretronio9030 kool!

Ah, a man of culture

terrytrollface blursed

Doomguy:oh ho then come as close as you like

@@somerandompersonontheinter2004 ZA DOUBLE BARRUDO!!

I am.

@ElJoJos Xdxdxd I don't think I'm alone in saying that modding id games is why I learned a lot of things, including C.

@ElJoJos Xdxdxd i feel like most ppl watching videos this niche would fall into this category :p

@@BigboiiTone well I'm not a programmer but I do like to understand how things work

@@decino U are just a Zcsripter, *_Not a big Suprise_* Also, I have Decorate Knowledge and even at Doom builder.

Doom irl

yes

That's a good one

insane papyrus

Me, a superior human: *DOOT SKELETON*

@@brucehc4975 boner

Lanky boi

4-Hope you don't die

correct the maps are 3D the enemies are 2D sprites

@@thissitesucks905 Do you really believe you said something useful?

Sure doom has 3d coordinates, but nothing in the game is an actual 3d model. If that were the case, levels would be nowhere near as editable as they are.

@@noop9k just wanted to say it

@@illuminatidad yeah the map geometry is super simple collections of planed sprites it’s not full 3d modeling or anything, that’s why the objects and layouts are a bit limited

"no not oney"?

If only.

Protip: To defeat Doomguy, shoot him until he dies

Oh you meant attack

I really liked that yellow!

why did I read that as decino changed his dick. Hmm. I seem to have issues.

I thought I was just imagining it

Gathering The Easter Eggs

Now THERE'S a fight I'd pay to see.

Yo I appreciate this comment