Lua scripting system platform, C++ Modding API, SDK generator, blueprint mod loader, live property editor and other dumping utilities for UE4/5 games.
- Lua Scripting API: Write lua mods based on the UE object system
- Blueprint Modloading: Spawn blueprint mods automatically without editing/replacing game files
- C++ Modding API: Write C++ mods based on the UE object system
- Live Property Viewer and Editor: Search, view, edit & watch the properties of every loaded object, great for debugging mods or figuring out how values are changed during runtime
- UHT Dumper: Generate Unreal Header Tool compatible C++ headers for creating a mirror .uproject for your game
- C++ Header Dumper: Generate standard C++ headers from reflected classes and blueprints, with offsets
- Universal UE Mods: Unlock the game console and other universal mods
- Dumpers for File Parsing: Generate
.usmapmapping files for unversioned properties - UMAP Recreation Dumper: Dump all loaded actors to file to generate
.umapsin-editor - Other Features, including Experimental features at times
The goal of UE4SS is not to be a plug-n-play solution that always works with every game. The goal is to have an underlying system that works for most games. You may need to update AOBs on your own, and there's a guide for that below.
The easiest installation is via downloading the non-dev version of the latest non-experimental build from Releases and extracting the zip content to /{Gameroot}/GameName/Binaries/Win64/.
If your game is in the custom config list, extract the contents from the relevant folder to Win64 as well.
If you are planning on doing mod development using UE4SS, you can do the same as above but download the zDEV version instead.
Generating UHT compatible headers
Creating Compatible Blueprint Mods
Unreal Engine Modding Discord Server Invite
- A computer running Windows.
- Linux support might happen at some point but not soon.
- A version of MSVC that supports C++20, including std::format.
- Visual Studio 2019 (recent versions), and Visual Studio 2022 will work.
- More compilers will hopefully be supported in the future.
- Rust toolchain 1.73.0 or greater
- xmake >= 2.9.2
- Clone the repo.
- Execute this command:
git submodule update --init --recursiveMake sure your Github account is linked to your Epic Games account for UE source access. Do not use the--remoteoption because that will force third-party dependencies to update to the latest commit, and that can break things. You will need your github account to be linked to an Epic games account to pull the Unreal pseudo code submodule.
There are several different ways you can build UE4SS.
xmake allows you to flexibly configure some build options to suit your specific needs. The following is a non-comprehensive list of configuration settings you might find useful.
Important
All configuration changes are made by using the xmake config command. You can also use xmake f as an alias for config.
After configuring xmake with any of the following options, you can build the project with xmake or xmake build.
The build modes are structured as follows: <Target>__<Config>__<Platform>
Currently supported options for these are:
-
TargetGame- for regular gamesCasePreserving- for games built with case preserving enabled
-
ConfigDev- development buildDebug- debug buildShipping- shipping(release) buildTest- build for tests
-
PlatformWin64- 64-bit windows
Tip
Configure the project using this command: xmake f -m "<BuildMode>". -m is an alias for --mode=<BuildMode>.
By default, the patternsleuth tool installs itself as an xmake package. If you do not intend on modifying the patternsleuth source code, then you don't have to configure anything special. If you want to be able to modify the patternsleuth source code, you have to supply the --patternsleuth=local option to xmake config in order to recompile patternsleuth as part of the UE4SS build.
By default, UE4SS generates a proxy based on C:\Windows\System32\dwmapi.dll. If you want to change this for any reason, you can supply the --ue4ssProxyPath=<path proxy dll> to the xmake config command..
By default, UE4SS uses Tracy for profiling. You can pass --profilerFlavor=<profiler> to the xmake config command to set the profiler flavor. The currently supported flavors are Tracy, Superluminal, and None.
You may encounter use for the some of the more advanced xmake commands. A non-comprehensive list of some useful commands is included below.
| Syntax | Aliases | Uses |
|---|---|---|
xmake <command> --yes |
xmake <command> -y |
Automatically confirm any user prompts. |
xmake --verbose <command> |
xmake -v <command> |
Enable verbose level logging. |
xmake --Diagnostic <command> |
xmake -D <command> |
Enable diagnostic level logging. |
xmake --verbose --Diagnostic --yes <command> |
xmake -vDy <command> |
You can combine most flags into a single -flagCombo. |
xmake config |
xmake f |
Configure xmake with any of these options. |
xmake clean --all |
xmake c --all |
Cleans binaries and intermediate output of all targets. |
xmake clean <target> |
xmake c <target> |
Cleans binaries and intermediates of a specific target. |
xmake build |
xmake b |
Incrementally builds UE4SS using input file detection. |
xmake build --rebuild |
xmake b -r |
Forces a full rebuild of UE4SS. |
xmake build <target> |
xmake b <target> |
Incrementally builds a specific target. |
xmake show |
Shows xmake info and current project info. | |
xmake show --target=<target> |
xmake show -t <target> |
Prints lots of information about a target. Useful for debugging scripts, compiler flags, dependency tree, etc. |
xmake require --clean |
xmake q -c |
Clears all package caches and uninstalls all not-referenced packages. |
xmake require --force |
xmake q -f |
Force re-installs all dependency packages. |
xmake require --list |
xmake q -l |
Lists all packages that are needed for the project. |
xmake project --kind=vsxmake2022 --modes="Game__Shipping__Win64" |
xmake project -k vsxmake2022 -m "Game__Shipping__Win64" |
Generates a Visual Studio project based on your current xmake configuration. You can specify multiple modes to generate by supplying -m "Comma,Separated,Modes". If you do not supply any modes, the VS project will generate all permutations of modes. |
To generate Visual Studio project files, run the xmake project -k vsxmake2022 -m "Game__Shipping__Win64" command.
Afterwards open the generated .sln file inside of the vsxmake2022 directory
Note that you should also commit & push the submodules that you've updated if the reason why you updated was not because someone else pushed an update, and you're just catching up to it.
Warning
The vs. build plugin performs the compile operation by directly calling the xmake command under vs, and also supports intellisense and definition jumps, as well as breakpoint debugging.
This means that modifying the project properties within Visual Studio will not affect which flags are passed to the build when VS executes xmake. XMake provides some configurable project settings
which can be found in VS under the Project Properties -> Configuration Properties -> Xmake menu.
Tip
Additional modes can be generated by running xmake project -k vsxmake2022 -m "Game__Shipping__Win64,Game__Debug__Win64".
Further explanation can be found in the xmake command table.
Caution
If you change your configuration with xmake config, you may need to regenerate your Visual Studio solution to pick up on changes to your configuration. You can simply re-run the xmake project -k vsxmake2022 -m "<modes>" command to regenerate the solution.
If you want to update git submodules, you do so one of three ways:
- You can execute
git submodule update --init --recursiveto update all submodules. - You can also choose to update submodules one by one, by executing
git submodule update --init --recursive deps/<first-or-third>/<Repo>. Do not use the--remoteoption unless you actually want to update to the latest commit. - If you would rather pick a specific commit or branch to update a submodule to then
cdinto the submodule directory for that dependency and executegit checkout <branch name or commit>. The main dependency you might want to update from time to time isdeps/first/Unreal.
All contributors since the project became open source: https://github.com/UE4SS-RE/RE-UE4SS/graphs/contributors
- Original Creator The original creator no longer wishes to be involved in or connected to this project. Please respect their wishes, and avoid using their past usernames in connection with this project.
- Archengius
- UHT compatible header generator
- CasualGamer
- Injector code & aob scanner is heavily based on his work, 90% of that code is his.
- SunBeam
- Extra signature for function 'GetFullName' for UE4.25.
- Regex to check for proper signature format when loaded from ini.
- Lots and lots of work on signatures
- tomsa
- const char* to vector<int> converter
- tomsa: Idea & most of the code
- Original Creator: Nibblet support
- const char* to vector<int> converter
- boop / usize
- New UFunction hook method
- RussellJ
- Blueprint Modloader inspiration
- Narknon
- Certain features and maintenance/rehosting of the project
- DeadMor0z
- Certain features and Lua updates/maintenance
- OutTheShade
- Unreal Mappings (USMAP) Generator
- DmgVol
- Inspiration for map dumper
- Buckminsterfullerene
- Rewriting the documentation, various fixes
- trumank
- Lua bindings generator, various fixes, automation & improvements
- localcc
- C++ API
- GreenHouse
- Otis_Inf
- SunBeam
- Motoson
- hooter
- Synopis
- Buckminsterfullerene