[InZOI] Modding Guides & Resources

[CUUPIDON]

This is something that I’ve been working on since August of 2024 when Character Studio released. Any information here or on the drive might change with time or the whole thing may no longer be maintained after modding tools are officially released in May. For the time being, I wanted to share everything I’ve learned since then with those who might be interested in it.

This is a community effort—everything here has been gathered by both myself and others through lots of trial and error. Thank you to everyone who’s contributed to these guides and resources!

Basics

These guides assume you have some experience with Blender and Unreal Engine 5.4+. I my guides don't cover super basic steps (like how to install software, addons, etc.), but I try to keep it as pain-free as possible. If you're just starting out, I recommend looking into official documentation and beginner-friendly tutorials with the links below first.

If you're brand new to Blender or Unreal, start here:

• Unreal Engine Documentation (v5.4)

• Blender Manual (v4.2)

• Blender Beginner Tutorial Series (By Ryan King Art)

• Unreal Engine 5 Beginners Course (By Unreal Sensei)

Making InZOI Moddable

Below is a list of all of tutorials and their required resources to make InZOI capable of loading mods. 

Signature Bypass

Prerequisites:

• InZOI
• Bitfix .Sig Bypass: Needed to load custom .paks, .utocs, & .ucas files into the game.

InZOI .Sig Bypass Guide

How To Enable Mods (By DJ KingSupreme)

InZOI Vortex Extension (UE4SS)

Prerequisites:

• InZOI
• Vortex: Nexus Mod Manager.
• InZOI Vortex Extension (UE4SS): Used to mod Unreal Engine 4/5 games. Needed to to load mods.

Install instructions on the nexus page above

Mod Organizer 2: InZOI Support

Prerequisites:

• InZOI
• Mod Organizer 2: Used for managing mods.
• Mod Organizer 2 InZOI Plugin: Adds support for InZOI to MO2

Install instructions on the nexus page above

Modding Guides

Below is a list of all of modding guides and their required resources. Listed In the order they should be followed.

Using The InZoider Blender Add-On

Prerequisites:

• InZoider Add-on: Thank you to Hancapo. Used to replace 3D Printed Items with meshes of your choice.
• Blender 4.2.2: Used to edit meshes.

InZoider Import Tutorial (By Reginleif - Asto)

InZoider Scaling Tutorial (By Reginleif - Asto)

Browse & Extract InZOI Game Assets

Prerequisites:

• FModel: Used to browse & extract Unreal Engine game assets.
• InZOI Mappings: Needed to decrypt the .ucas &.utoc files to make the assets viewable.
• Converted InZOI .pak files: Converted by QuickBMS to be viewable in FModel.
• Blender 4.2.2: Used to edit meshes.

InZOI Asset Browsing & Extraction Guide

Unreal Project Set Up Guide

Prerequisites:

• UE 5.4.4 [InZOI]: Thank you to FrancisLouiss. Used to package assets for InZOI. (UE is a private repo on GitHub. You need and Epic Games account linked to your Github account for access. Otherwise, you will land on a 404 page.)
• DefaultPakFileRules.ini: Thank you to Slinky on Discord. Used to pack .json files into your .pak files.

InZOI Unreal Project Set Up Guide

Asset Replacement Guide

Prerequisites:

• Blender 4.2.2: Used to edit meshes.
• PSK & PSA Blender Addon: Used to import & export the format that FModel gives you.
• UE 5.4.4 [InZOI]: Thank you to FrancisLouiss. Used to package assets for InZOI. (UE is a private repo on GitHub. You need and Epic Games account linked to your Github account for access. Otherwise, you will land on a 404 page.)
• InZOI Unreal Editor Project: Creation Tutorial Or Premade Project.
• A mesh you’ve already edited: This tutorial assumes you are ready to export a mesh from Blender to Unreal.

InZOI Asset Replacement Guide

Packaging Video (by Aethel Hexem)

Click Spoiler for preview of final product:

  Reveal hidden contents

Texture Guide

Prerequisites:

• Thank you to Huwie on discord for figuring this out.
• UE 5.4.4 [InZOI]: Thank you to FrancisLouiss. Used to package assets for InZOI. (UE is a private repo on GitHub. You need and Epic Games account linked to your Github account for access. Otherwise, you will land on a 404 page.)
• Blender 4.2.2: Used to edit meshes & see textures.
• InZOI Unreal Editor Project: Creation Tutorial Or Premade Project.
• A project you’ve already edited: This tutorial assumes you are ready to export a mesh and/or texture from Blender to Unreal.
• Thank you to Huwie on discord for figuring out new textures.
• Thank you to Slinky on discord for figuring out material node setup.
• Thank you to Aethel Hexem for assisting me with textures.

InZOI Texture (New & Replacements) Guide

Click Spoiler for preview of final product:

  Reveal hidden contents

Json Guide

Prerequisites:

• InZOI JsonResult files.
• Notepad++ (Or similar).
• UE 5.4.4 [InZOI]: Thank you to FrancisLouiss. Used to package assets for InZOI. (UE is a private repo on GitHub. You need and Epic Games account linked to your Github account for access. Otherwise, you will land on a 404 page.)
• InZOI Unreal Editor Project: Creation Tutorial Or Premade Project you are already working on and have assets for.
• Non-Asset Support in your Unreal Project.
• Visible File Extensions.
• Thank you to Slinky on discord for figuring this out.

InZOI JSON (Editing Existing & Making New Assets) Guide

Click Spoiler for preview of final product:

  Reveal hidden contents

Work In progress...

Modding Resources

Below is a list of all of modding guides and their required resources. Listed In the order they should be followed.

InZOI Contest Assets

Contains body meshes for male & female Zois.

Prerequisites:

• Marvelous Designer: They were made for MD and cannot be exported to Blender or any other 3D Modeling program.

InZOI Contest Assets

UAssetGUI

UAssetGui compiled with most recent Github repo. Is compatible with InZOI Mappings.

Prerequisites:

• Decompiled InZOI .pak, .utoc, & .ucas files. They need to be unpacked with Retoc or Unrealpak (Comes w/ Unreal Editor) into .uasset files. The .uasset files from FModel are NOT compatible.
• InZOI Mappings: Needed to decrypt the .ucas &.utoc files to make the assets viewable.
• Converted InZOI .pak files: Converted by QuickBMS to be viewable in FModel & usable with Unrealpak or Retoc.

UAssetGUI

Information Resources Links

A Google document with all the resources I used.

Prerequisites:

• None

Information Resource Links

Scratch Notes

A Google document with all the notes I've taken while putting things together. Mostly me just crashing out.

Prerequisites:

• None

Scratch Notes

Work In progress...

Discord Links

• InZOI Official Discord Server: The official discord server for InZOI. Has a modding category with people who are working together to mod the game.
• InZOI Archive: An archive of all the mods and tutorials created for InZOI.

Work In progress...

Edited April 15 by CUUPIDON
Added MO2

[GlitchParrot]

Damn, thank you! That's exactly what I needed — something to quickly navigate through the information.

[soyzoimods]

I love you for this really appreciate all the hard work you've put in!

[etoven]

Google docs "some notes I put together nostly just me burning out.."

That hit true..

 

[FrawgMaster]

Awesome tutorial, really well detailed and formatted.  Lots of useful information that I will definitely be referring back to. 
Could I request you add the mod loader Mod Organizer 2 to your tutorial? I created an advanced plugin for MO2 to handle inZOI modding and have tested it extensively. 

Mod Organizer 2 GitHub: Mod Organizer 2
Plugin to allow Mod Organizer 2 to Support inZOI: MO2 Advanced inZOI Support Plugin

[CUUPIDON]

  On 4/14/2025 at 2:59 AM, FrawgMaster said:

Awesome tutorial, really well detailed and formatted.  Lots of useful information that I will definitely be referring back to. 
Could I request you add the mod loader Mod Organizer 2 to your tutorial? I created an advanced plugin for MO2 to handle inZOI modding and have tested it extensively. 

Mod Organizer 2 GitHub: Mod Organizer 2
Plugin to allow Mod Organizer 2 to Support inZOI: MO2 Advanced inZOI Support Plugin

Expand  

Added it to the post

[an0nym0uz]

Thanks a lot for your contribution, effort & time you put into this!

Very well formatted and presented!

[HalfDome]

First - awesome tutorial!  It's thorough and pulls everything together, exactly what's needed in these early stages.

To test the process in my own environment, I worked through all the steps, but clicking on my mod in game (an asset replacement) the game crashes.  I'm sure it's something I've done incorrectly, but I can't find it.  I've gone through everything 3-4 times checking proper tool versions, folder org, and import/export options, even not making any changes in Blender to be sure I'm not effing something up in there.

Any clues, hints, or suggestions about where to look would be helpful.

I'm not new to modding, have made my own mods for 3-4 games, have used other versions of Blender, but this is my first time in UE.

Thanks in advance.

[jpgjpgod]

Can I import 3d models as well from Smutbase?

[CUUPIDON]

  On 4/20/2025 at 8:30 PM, HalfDome said:

First - awesome tutorial!  It's thorough and pulls everything together, exactly what's needed in these early stages.

To test the process in my own environment, I worked through all the steps, but clicking on my mod in game (an asset replacement) the game crashes.  I'm sure it's something I've done incorrectly, but I can't find it.  I've gone through everything 3-4 times checking proper tool versions, folder org, and import/export options, even not making any changes in Blender to be sure I'm not effing something up in there.

Any clues, hints, or suggestions about where to look would be helpful.

I'm not new to modding, have made my own mods for 3-4 games, have used other versions of Blender, but this is my first time in UE.

Thanks in advance.

Expand  

Well, the game would crash because I wasn't using the correction version of Unreal Editor (the one by Francis) or it was crashing because I wasn't I wasn't properly referencing an assets the mesh needs (i.e. skeleton). I can't tell you from here though because I would have to see your mod files (your project files too perhaps). If you want to send me that stuff so I can have a look, you can do it here or on discord @ museeeeeee.