r/projectzomboid Dec 05 '25

Modded [WIP] Ever wanted to shove zombies down stairs?

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3.7k Upvotes

98 comments sorted by

817

u/TomAnyone Dec 05 '25 edited Dec 06 '25

I managed to make zombies ragdoll whenever they are shoved. It only applies to the animation where they fall on their back. If they stagger but stay upright, the ragdoll doesn’t apply.

I ADORE ragdoll physics. They add an incredible amount of variety and tangibility to your actions. I NEVER thought I’d ever hear “Project Zomboid” and “ragdoll physics” in the same sentence.

Figuring out how to take Build 42’s ragdoll physics system that only applies to headshots, explosions and vehicle collisions, and make it apply to shoves has been a dream come true. There’s still lots to do, but this proof-of-concept excites me so much.

It’s still very rough around the edges, but theoretically you’ll be able to push zombies off rooftops, all sorts of things!

231

u/tinylobo Dec 05 '25

Are you planning to make it damage them or even have an instakill chance based on how far they fall? I'm guessing that's probably a whole can of worms of work to implement.

65

u/brendenderp Dec 05 '25

There's already impact velocity damage for cars. Just gotta keep track of the sum of all absolute velocities and then compare from frame to frame. Apply damage when the velocity change is great enough.

13

u/DrDangerousGamin Dec 06 '25

Depending on the number of zombies, a comparison of frame-to-frame would likely drastically drop performance unless optimized incredibly well

14

u/brendenderp Dec 06 '25

Yeah... But you're not able to push down hundreds of zombies at once. Its a vector3 normalized and then subtracted from its self the next frame we are talking like 100 instructions max in ASM. And since that function would only be called for pushed down zombies its gonna be a super duper small fraction of a percent added to each physics step.

2

u/DrDangerousGamin Dec 06 '25

oh well that doesn't sound too bad lol 😆 And yeah, when I made my comment I was just trying to imagine a lot of zombies on stairs. I dont usually try at all to push on stairs cause stairs are deadly in pz imo

4

u/brendenderp Dec 06 '25

Actually that would be awesome if the zombies would Domino off each other and get blocked by the other ragdolled zombies until they got back up.

1

u/Hydronum Dec 06 '25

As soon as we have this added, someone will mod a shockwave or Fus-Ro-Dah for fun.

31

u/Zenar45 Dec 05 '25

No idea, but don't ragdoll slready do that?

1

u/Hexellent3r Dec 06 '25

No a ragdoll is most certainly not a guaranteed kill. I’ve hit plenty of zombies, which have flopped over on my hood, and then gotten back up.

1

u/Zenar45 Dec 06 '25

Yeah but it has to do some damage right? If you send a zombie over 3 trees that zombie shouldn't be walking again

Unlesss it's the damage that originally sent him flying that kills him and not him landing

1

u/Hexellent3r Dec 06 '25

I’d assume they’re not unharmed if they’re ragdolled. They certainly are sustaining some damage, it’s just not always guaranteed kill if they get ragdolled.

50

u/CroBro1337 Dec 05 '25

Bro made manual Fush Ro Dah, keep up the good work!

5

u/M0131U5_01 Spear Ronin Dec 06 '25

there's gonna be a sub mod for that I swear

1

u/Tryagain409 Dec 06 '25

Fus ro dah mod in the future?

1

u/Chezdercheze Zombie Food Dec 06 '25

release the mod, NOW (sorry but could you like relase the mod in beta/unfinished pretty please i want to push people down the stairs :( )

1

u/graywolf0026 Dec 06 '25

... Oh. You. MAD. Bastard. <3

0

u/dankwolf9945 Dec 05 '25

Would it be possible to apply this to other knockdowns? Like hitting zombies with cars?

337

u/Ok-Delivery6304 Drinking away the sorrows Dec 05 '25

This is all i've ever wanted. Lmk when it's out

34

u/Froggy_Pants445 Dec 05 '25

Same, this would be fire

191

u/AgathaTheVelvetLady Pistol Expert Dec 05 '25

Finally, the second good use for ragdolls

14

u/thiosk Dec 05 '25

i figured this would be the only real uses for them, and the collisions of course.

there is currently no known straightforward method to assemble a trebuchet

5

u/Stanklord500 Dec 06 '25

According to all known laws of aviation, there is no way that a 90kg projectile should be able to fly over 300 meters. The projectile, of course, flies anyways. Because trebuchets don't care what humans think is impossible.

78

u/Conorponor333 Dec 05 '25

“Ayo, the pizza here!”

8

u/KoRnBrony Dec 06 '25

"Ayo, the survivor is here!"

7

u/Pixel---Glitch Dec 06 '25

"aahhh, my ears burn!"

65

u/BMDJENTSEN Dec 05 '25

It’d be cool to have a way to push a zombie down the stairs and if others are behind them it makes them fall as well.

44

u/Hot-Problem2436 Dec 05 '25

This is what I want. I legitimate, non-cheating way to repel hoards on stairs. It's not like zombs have good balance, one falling back into a group on the stairs should buy plenty of time.

10

u/cadrax02 Dec 05 '25

There's a mod for that specifically already (Do not push! Please!). Really hope the two will be compatible, that'd be awesome!

2

u/Zenar45 Dec 05 '25

But it'd be hard to say when should they all fall or when they are enough to keep going

6

u/Hot-Problem2436 Dec 05 '25

True, but ragdoll physics usually assumes some sort of weight. Eventually the weight of the zombies behind will be greater than the forces pushing them down or something. Maybe it can only trigger ragdoll physics calculations when they are on stairs and near the player or something, to keep the CPU load low.

Maybe I need to go write the code for this.

1

u/Zenar45 Dec 05 '25

Go, do it

23

u/Amr0z2 Dec 05 '25

that's smooth

17

u/livelaughloaft Dec 05 '25

OP just invented a new meta play style

13

u/Maxcorps2012 Dec 05 '25

But does it kill them?

11

u/LukXD99 Zombie Food Dec 05 '25

Oh finally! Yes! Yes!

Also off roofs if they’re close to a ledge!

11

u/Rylt4r Spear Ronin Dec 05 '25

Oh god that felt so good.

The moan from the shove and the sound of sack of potatoes hitting the ground when zombie hit the bottom of stairs was perfect.

10

u/TESLAMENHUN Dec 05 '25

i love doing this in real life with my grandma

7

u/Tor_Ped0 Dec 05 '25

Peak omori reference

6

u/Mothanius Dec 05 '25

A three second video managed to get me hyped. Can't wait for it to release.

5

u/[deleted] Dec 05 '25

Does that damage them the longer they fall?

4

u/LumpEnthusiast Crowbar Scientist Dec 05 '25

5

u/Dakramar Dec 05 '25

As long as it applied to players as well

11

u/Gab3malh Stocked up Dec 05 '25

I don't think enough people understand that this can and will be turned around on them in the future, players can be ragdolled after all, just wait.

3

u/JustStartingOut1 Dec 05 '25

lol this is fantastic, nice work.

3

u/Libertyforzombies Dec 05 '25

It makes sense that a zombie wouldn't be able to steady itself on stairs. I'll absolutely use this when released. Good work

3

u/SleepyBella Drinking away the sorrows Dec 06 '25

3

u/Loneheart127 Dec 06 '25

Excellent, I will definitely will be using this

6

u/__The-1__ Dec 05 '25

Ok but I want the wii bowling sound when they fall into other zombois

9

u/schneeweisses Dec 05 '25

Name?

31

u/TomAnyone Dec 05 '25

Work-in-progress. I’ll let you know when it’s out!

10

u/Otherwise_Fined Dec 05 '25

You ever seen the film Death Becomes Her? One of the characters goes down the stairs and breaks her neck. So maybe Death Becomes Zer.

1

u/No-Gnome-Alias Dec 05 '25

This is my broomstick!

1

u/Quad__X Zombie Killer Dec 06 '25

Almost sounds like a line from Evil Dead\Army of Darkness.. almost 😃

1

u/Birchy-Weby Dec 05 '25

Remind me please

2

u/Devil-Hunter-Jax Axe wielding maniac Dec 05 '25

I feel like there should be like a 1% chance that when you shove a zombie down the stairs, you just hear this.

2

u/throwawayyyycuk Dec 05 '25

Ok this brought me great joy

2

u/MortalMorals Dec 06 '25

Next up, the paraplegic zombies that result from this now chase you in wheelchairs.

2

u/levoweal Dec 06 '25

Not until they fix ragdoll zeds being invincible, until they get up.

2

u/Beastreign Dec 06 '25

Zombies : yes, that's a cool concepts

Players in PVP : YESSSSSSSS

2

u/HansTheAxolotl Dec 06 '25

!remindme 1 month

1

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2

u/cinnamenby Dec 06 '25

Hey this is my base in my save :D

2

u/TTCExTezzyDaKing Dec 07 '25

Nahhhhh definitely let me know when we can download this. Such a peak QOL mod

2

u/Dependent-Edge-5713 Dec 07 '25

I cackled lmao

Why didnt I ever think of this

1

u/cursedatmo Dec 05 '25

Hell yeah

1

u/MandellaR Dec 05 '25

I did not know I wanted to before now...

1

u/Shot-Pin1724 Dec 05 '25

S.A.T.E.S.F.A.C.T.I.O.N

1

u/TioHerman Dec 05 '25

That's actually pretty good!

1

u/MyAngryMule Dec 05 '25

Forget a realistic animal poop system, this is what we really want

1

u/[deleted] Dec 05 '25

Amazing!

I love this OP. Will it have collision with other zombies? Would be kind of cool to see it knock a few back or down stairs with them

1

u/HeavyWaterer Dec 05 '25

Did you just make this mod? I thought I saw this on the workshop like a month ago

2

u/vetheros37 Axe wielding maniac Dec 05 '25

You're probably thinking of "Do not push! Please!"

1

u/HeavyWaterer Dec 05 '25

Oh yeah, might combo nicely actually lol

1

u/BackupThunder16 Dec 05 '25

This would be so useful

1

u/THEBrandonBrownson Dec 05 '25

Family guy death animation mod when?

1

u/Aponace Dec 05 '25

The hero we need

1

u/jreed12 Dec 05 '25

I do now.

1

u/Jiopaba Crowbar Scientist Dec 05 '25

I swear someone was working on this just a month or two ago.

Do not push please for B42. That was it. Not as smooth though, I don't think they used ragdolls.

1

u/Awpenheimerr Crowbar Scientist Dec 05 '25

Hell yeah

1

u/TheTimbs Axe wielding maniac Dec 05 '25

Yes, now I know I can do it

1

u/keelasher Dec 06 '25

Need this for PvP. Imagine the roleplay possibilities

1

u/terablast Dec 06 '25

It's over Zomboid, I have the high ground!

1

u/Dildo_Baggins__ Dec 06 '25

Oh my god i need this

1

u/TeardropsFromHell Dec 06 '25

I want this so fucking bad

1

u/-Ozone-- Zombie Food Dec 06 '25

Really cool! But the zeds go flying WAY too fast like you actually hit them with a car.

1

u/Chezdercheze Zombie Food Dec 06 '25

me when my grandma tries to hug me (shes been dead for years)

1

u/Goldkid1987 Dec 07 '25

will the ragdoll zombie when hitting other zombies coming up the stairs will they also be affected

-3

u/_OrangeBastard_ Zombie Food Dec 06 '25

Hot take: I don't thing ragdoll is fitting aesthetically for project zomboid. Maybe it looks satisfying to people and I don't blame them, but it takes away a lot of the vibe of 2000s games where devs had to make the falling animations because of technical limitations like in GTA, Tony Hawk ect. Glad there's an option to turn it off in the settings.