Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
c-sharpcsharpcsharp-coredotnetdotnet-coreemulatorgplgplv3mmommo-enginemmorpgmmorpg-serveronlinerpgrunuoserverservuoultimaultima-onlineuo
> [!IMPORTANT] > Please read through these changes, as they changed certain expectations for how the internal AI thinking/movement work. > Note that some mobs still don't have smooth movement on ClassicUO due to how the client handles animations/movement. ### Summary - **Important Change**: Mobs will now move at a more regular pace. If the OnThink results in a move, but the cooldown would otherwise prevent the move, then the movement is scheduled on another timer. - Added a 400ms delay to mobs turning to face a player to attack in order to avoid glitching between moving and turning. - Reverted AI thinking speeds back to RunUO specific speeds. - Reverted the AI thinking to moving conversion delays back to RunUO. - For thinking speeds that are not exactly the predefined speeds from RunUO, there is a new calculation to determine the correct conversion to movement speed. This stops speeds like `0.35` from being faster than `0.3` > [!NOTE] > **Developer Note** > BaseAI.CheckMove() no longer contains the check for whether or not a mob is on movement cooldown. This function can now be overwritten without causing issues to figuring out that cooldown. |
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| .config | ||
| .github | ||
| Distribution/Data | ||
| docs | ||
| Projects | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| azure-pipelines.yml | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| Directory.Build.props | ||
| FAQ.md | ||
| global.json | ||
| LICENSE | ||
| mkdocs.yml | ||
| ModernUO.sln | ||
| publish.cmd | ||
| publish.sh | ||
| README.md | ||
| rider-settings.zip | ||
| Rules.ruleset | ||
| RUNUO_TO_MODERNUO.md | ||
| SPONSORS.md | ||
| stylecop.json | ||
| THIRD-PARTY-NOTICES | ||
| version.json | ||
ModernUO

Ultima Online Server Emulator for the modern era!
Requirements
Supported Operating Systems
Required Frameworks
All Operating Systems
Windows
Development
Supported IDEs
Getting Started
- Install prerequisite requirements
- Clone this repository (or download the latest):
git clone https://github.com/modernuo/ModernUO.git
- Open
ModernUO.slnto start developing
Building/Publishing
- Run
./publish.cmd [release|debug (default: release)] [os] [arch (default: x64)]os- Supported operating systemswin- Windows 10/11/2019/2022osx- MacOS 11/12/13 (Big Sur, Monterey, Ventura)linux- Linux
archx64- Intel 64-bitarm64- ARM 64-bit (Windows Arm64 not supported)
Linux Prerequisites
Fedora, CentOS, RHEL, etc
dnf upgrade --refresh -y
# CentOS does not come with EPEL enabled
dnf install -y epel-release epel-next-release
dnf install -y findutils libicu zlib-devel zstd libargon2-devel tzdata
Ubuntu, Debian, etc
apt-get update -y
apt-get install -y libicu-dev libz-dev zstd libargon2-dev tzdata
Running the Server
- Follow the publish instructions
- Run
ModernUO.exeordotnet ModernUO.dllfrom theDistributiondirectory on the
Troubleshooting / FAQ
- See FAQ
Want to sponsor?
Thank you for supporting us! You can find out how by visiting the sponsors page.
Collaborators
Thanks
- RunUO Team & Community
- Voxpire, the ServUO Team & Community
- Karasho, Jaedan and the ClassicUO Community



