I created my first mod for realistic heart pickups and health conteiners. Do yall have any suggestions on what I should add or change? https://steamcommunity.com/sharedfiles/filedetails/?id=3820538026

I’m curious if there’s a steam workshop mod that shows how many coins you’ve donated with each character as I was unable to find one.

Hello.

I'm making an item that has a 10% chance for each tear to become orange and give the confusion effect on hit, I looked up a couple of tutorials, documentation and even posts here on Reddit and made this code.

function mod:OnTearInit(tear)
  local player = tear.SpawnerEntity:ToPlayer()

  if not player then
    return
  end

  local tearData = tear:GetData()

  -- Daddy's Juice
  if player:HasCollectible(DJ) then
    local roll = math.random(100)
    if roll <= DJStunChance then
      -- These do nothing
      tear.TearFlags = tear.TearFlags | TearFlags.TEAR_CONFUSION
      tear.Color = Color(1, 0.25, 0, 1)
    end
  end
end

mod:AddCallback(ModCallbacks.MC_POST_TEAR_INIT, mod.OnTearInit)

I have checked that, upon shooting, the code does get to the point where it should set the tears flag and change their colour, however it seems those two lines do nothing, as, although they do get executed, the tear's colour stays the same and they don't apply confusion to the enemies.

I have looked for a solution for a while but couldn't find anything, can you help me please? Thanks in advance

I have 0 experience with making mods, so if anyone could maybe help me with this:

Thing is, I don't really like how the tentacle body looks like, and it makes the Leviathan transformation kind of bad in my opinion (aesthetically). So, could anyone change it so instead of tentacles its just the normal default body with wings (Seraphim style, but with black body and leviathan face)? I'd appreciate it :D

Most of my trouble involved getting files to where they should be. I tried to extract to repentagon launcher on, but I couldn’t get the location of the file right. When I eventually did get the launcher up, it could find any files except for the ones on the desktop. I tried to put the files on my desktop to do it and it seemingly worked as the file renamed to repentagon, but after putting the files back into Isaac and putting in the launcher code in the steam settings, nothing happened and the game never launched anything. For the most part I think I need a more specific guide on how to install it as my attempt to follow the instructions from the website had difficulties.

Hey, I've been playing with 50+ mods and getting slowdowns, especially in bigger or busier rooms. I wanted to understand what was taking so much time, so I started building a profiler for my own setup. It's now at a point where I'd like other people to try it, particularly mod authors.

It's called Isaac Doctor. You record a section of gameplay, then inspect it in a local browser UI similar to Chrome's Performance tab.

GitHub, screenshots and documentation · Download

Screenshot: timeline, FPS graphs and mod breakdown

You can:

• Zoom into the callback timeline and break down costs by mod, hook and function.
• Find slow render/update intervals and look at FPS/UPS, frame-time percentiles and the callbacks in that range.
• Put those timings next to screenshots and sampled entity, effect and projectile counts.
• Connect your local mods folder to read Lua source beside a selected callback's timings.
• Choose which channels, mods and hooks to record, and start/stop on events such as room entry with configurable delays.

One example from my testing: some Diepio HUD callbacks were recreating fonts and loading assets during renders. After caching those in a local copy, their combined mean self time per call went from about 0.48 ms to 0.03 ms. Those were different runs, so I'm treating that as a callback-level improvement, not a claim that overall FPS increased by the same amount.

Screenshot: callback timing with Lua source

Currently Windows only, for Repentance+ with REPENTOGON. Extract the release ZIP, run IsaacDoctor.exe, launch the game through your usual REPENTOGONLauncher setup, then connect and record. The package includes the runtime, so you don't need to build it or install Python/Node. Recording and analysis stay local.

It's free and open source under MIT. It uses native callback instrumentation and saves binary recordings for later analysis. It helps investigate slowdowns; it doesn't automatically optimize your mods or account for every part of the engine.

If you make mods, I'd appreciate feedback on whether the timings and breakdowns are useful, anything confusing in the UI, and what you'd need to debug your own performance problems. If you've used the existing in-game Mod Profiler, I'd also like to hear what you find useful there that this is missing.

I've mostly tested it with my own mod setup so far. Bug reports and suggestions here or on GitHub are welcome.

(last ques for the day i just rlly need this explained bc how does this not work??)

function mod:EvaluateCache(player, cacheFlags)
    if cacheFlags & CacheFlag.CACHE_SPEED == CacheFlag.CACHE_SPEED then
        local ItemforSpeedCount = player:GetCollectibleNum(SOS)
        local speedToAdd = 1.3 * ItemforSpeedCount
        player.Speed = player.Speed + speedToAdd
    end
end


mod:AddCallback(ModCallbacks.MC_EVALUATE_CACHE, mod.EvaluateCache)
(code in question)

Im trying to follow along with Catinsured's binding of isaac moding tutorials, and i have this

local mod = RegisterMod("My cool mod X3", 1)
local HHP = Isaac.GetItemIdByName("Headless Horsemens Pumpkin")
local HPPDamage = 1

function mod:EvaluateCache(player, cacheFlags)
if cacheFlags & CacheFlag.CACHE_DAMAGE == CacheFlag.CACHE_DAMAGE then
local itemCount = player:GetCollectableNum(HHP)
local damageToAdd = HHPDamage * itemCount
player.Damage = player.Damage + damageToAdd
end
end

mod:AddCallBack(ModCallbacks.MC_EVALUATE_CACHE, mod.EvaluateCache)

and then the game comes back with

Mods/my cool mod/main. lua:13: attempt to call a nil value (method 'AddCallBack')

I need some help bc idk whats wrong with my code :<

ive changed some descriptions on the trinket missing poster and pasted the modified file both in a content folder like it says on isaacblueprints and inside resources to mimic the main game yet it does nothing

I’m looking for a mod where T. eves clots get all the transformations she gets. By this I mean if she gets, say brimstone, her clots will get little horns, or if she gets bozo, her clots would get little clown face paint. Again, I doubt this mod exists but if it does, and you know the name PLEASE tell me

hola que tal andan soy mrsmile estoy buscando gente para desarollar un mod de fnf llamado alejosnight para ayudarme necesito esto

1 artistas de frames

2 compositores

3 ayuda con el codding

es via discord y reddit

espero recibir ayuda bueno chao

Hey everyone! My first big mod is out: The Yo-Yo, a Treasure Room item that replaces your tears with a yo-yo on a string.

Hold fire to charge, release to throw it out in a looping arc, and it snaps back to your hand. Hits right at the end of the string do double damage.

It also has real yo-yo tricks:
- Around the World: tap fire mid-throw for a full loop around Isaac that knocks shots away
- Sleeper: hold fire and it spins in place, grinding enemies
- Walk the Dog: walk away during a Sleeper to drag it behind you

Like Mom's Knife, your items change the yo-yo itself:
- Brimstone: a beam of yo-yos
- Ludovico Technique: a big floating yo-yo you steer, with a string that whips enemies
- 20/20 / Inner Eye: extra yo-yos
- Fire Mind / Jacob's Ladder: a burning or electric yo-yo
- Tammy's Head / Sad Bombs: they fire yo-yos instead of tears
- The Forgotten gets a bone yo-yo, and Incubus throws mini yo-yos
- ...and a lot more

It works in co-op and with Jacob & Esau, supports EID, and doesn't need REPENTOGON.

Workshop: https://steamcommunity.com/sharedfiles/filedetails/?id=3814668525

It's my first mod, so any feedback or bug reports are really welcome!

So... I took the long time to convert all my songs into the correct file types, and when it got to the coding stuff, I just got really stuck. I looked at a reference of what it was supposed to look like, which was a working music mod I had, and I had no idea what to do. Can anyone with modding experience help me with this?

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Eu estava usando um mod de tradução para jogar e sem querer mudei o idioma e agora meus options ficaram bugados.

hi! i have kind of a unique idea for all you that create modded rooms

i am a modder myself but im just not creative when it comes to creating them 😅

anyways, this mod here: https://steamcommunity.com/sharedfiles/filedetails/?id=3580365574 (Haemo's Gizmos)

has an item called magic beans which adds these guys!: https://youtu.be/1lmKeHvl0pI?t=314

as it stands these guys are sadly only encounterable via a specific item, but it would be cool to encounter these guys naturally in big rooms or something :)

I liked the idea of Abyss locusts scaling based on the quality of the item I absorb and I want a mod that does something similar for void. the devoid Apollyon rework does exactly what I want but I don’t want the character rework that comes with it. do any mods like this already exist or is there some way I can change that mod so it only adds the void rework?

Is it possible to change rep+ IID descriptions and descriptions in "My Stuff!"?
I'm making a mod that changes all instances of one word to another for an inside joke in my group.
I have not been able to find any consistent info that works on changing the IID (rep+ feature) description, all I've found is info on changing EID mod descriptions and the little pop up blurb when you pick the item up.
Is this something that's possible?