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Highly Performant & Scalable Ultima Online Server Emulator https://www.modernuo.com
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Kamron Batman d3fdb180b3
fix: Fixes searching multis/clients. Adds missing map enumeration tests (#2278) 
> [!IMPORTANT]
> **Dev Note:** This is an **important** patch as the bug could lead to major issues like:
> * Multis/Players disappearing from view or not being counted during game logic.
> * World processes (e.g., area checks, targeting) failing to detect entities correctly.
> * General stability and correctness concerns for core map functionality.
>
> **Important Breaking Change**: Multis now properly use the map link list. This means modifying a multi while iterating will cause the server to crash. The crash _is expected_. Please modify/fix code accordingly to create a list using `PooledRefQueue` or `PooledRefList` instead of moving/deleting multis while inside the foreach.

### Summary

* Fixes a bug where deleting/moving a multi (boat/house) in some circumstances can use undefined behavior due to unsafe changes to List<BaseMulti>
* Fixes a bug where Multis may not be considered while searching due to a bug causing the sector search to end early.
2025-11-27 11:59:47 -08:00
.config feat: Adds .NET 10 / C# 14 support. (#2258) 2025-11-11 11:26:34 -08:00
.github chore: Adds Debian 13 to CI/CD (#2277) 2025-11-23 10:09:42 -08:00
Distribution/Data feat: Adds item graphic size to Bounds.bin and makes item graphic offset available to gumps (#2115) 2025-02-10 19:31:39 -08:00
docs chore: Updates .NET reference material to 10 (#2261) 2025-11-12 23:03:14 -08:00
Projects fix: Fixes searching multis/clients. Adds missing map enumeration tests (#2278) 2025-11-27 11:59:47 -08:00
.editorconfig chore(docs): Adds UnmanagedDataReader & BinaryFileReader documentation (#1968) 2024-10-01 17:07:51 -07:00
.gitattributes fix: Adds migration checks to CICD, updates dependencies, adds Fedora 37, alpine 3.17 support (#1309) 2022-12-22 12:12:47 -08:00
.gitignore feat: Moves logger to a separate assembly for reuse (#2001) 2024-12-30 20:25:34 -08:00
azure-pipelines.yml feat: Adds .NET 10 / C# 14 support. (#2258) 2025-11-11 11:26:34 -08:00
CODE_OF_CONDUCT.md Create CODE_OF_CONDUCT.md 2020-05-05 08:51:39 -07:00
CONTRIBUTING.md chore(license): Removes CLA requirement. All contributors moving forward will retain copyright. (#2038) 2024-12-31 02:52:58 -08:00
Directory.Build.props feat: Adds .NET 10 / C# 14 support. (#2258) 2025-11-11 11:26:34 -08:00
FAQ.md docs: Updates FAQ for time zone issues. (#1368) 2023-03-10 00:18:36 -08:00
global.json feat: Adds .NET 10 / C# 14 support. (#2258) 2025-11-11 11:26:34 -08:00
LICENSE Fixes more line ending issues (#267) 2020-09-27 13:54:56 -07:00
mkdocs.yml docs: Updates serialization docs (#1327) 2023-02-02 19:37:18 -08:00
ModernUO.sln feat: Moves logger to a separate assembly for reuse (#2001) 2024-12-30 20:25:34 -08:00
publish.cmd fix: Fixes publishing (#1808) 2024-05-31 12:59:59 -07:00
publish.sh fix: Fixes publishing (#1808) 2024-05-31 12:59:59 -07:00
README.md chore: Update README with logo link and image sources 2025-11-25 20:05:05 -08:00
rider-settings.zip Cleanup/Housekeeping (#242) 2020-09-12 15:31:21 -07:00
Rules.ruleset chore(docs): Adds UnmanagedDataReader & BinaryFileReader documentation (#1968) 2024-10-01 17:07:51 -07:00
SPONSORS.md chore: Updates readme files (#2247) 2025-07-27 11:04:32 -07:00
stylecop.json Updates formatting rules (#199) 2020-08-25 18:00:51 -07:00
THIRD-PARTY-NOTICES chore: Updates 3rd party notices (#1042) 2022-06-01 09:42:11 -07:00
version.json feat: Adds size/style support to gump builders, optimizes EscapeHtml (#2257) 2025-11-23 11:35:31 -08:00

README.md

ModernUO - Ultima Online Server Emulator for the modern era!

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Ultima Online Server Emulator for the modern era!

GitHub license GitHub stars GitHub issues
GitHub build Azure Pipelines build

Requirements

Supported Operating Systems

Windows 10/11/2012/2016/2019/2022/2025 MacOS 14+ Debian 12+ Ubuntu 22+ LTS
Alpine 3.22+ Fedora 42+ RedHat 9+ CentOS Stream 9+ openSUSE 15.6+ SUSE Enterprise 15 SP6 Linux Mint 21+ Arch

Required Frameworks

All Operating Systems

.NET

Windows

VC++ Redistributable v14

Development

git .NET

Supported IDEs

Jetbrains Rider 2025.3+ space VSCode space Visual Studio 2026

Getting Started

  • Install prerequisite requirements
  • Clone this repository (or download the latest):
    • git clone https://github.com/modernuo/ModernUO.git
  • Open ModernUO.sln to start developing

Building/Publishing

  • Run ./publish.cmd [release|debug (default: release)] [os] [arch (default: x64)]

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 libdeflate-devel zstd libargon2-devel

Ubuntu, Debian, etc

apt-get update -y
apt-get install -y libicu-dev libdeflate-dev zstd libargon2-dev

OSX Requirements

brew install icu4c libdeflate zstd argon2

Running the Server

  • Follow the publish instructions
  • Run ModernUO.exe or dotnet ModernUO.dll from the Distribution directory

Troubleshooting / FAQ

Want to sponsor?

Thank you for supporting us! You can find out how by visiting the sponsors page.

Collaborators

Kamron Batman Mark1145

Thanks

  • RunUO Team & Community
  • Voxpire, the ServUO Team & Community
  • Karasho, Jaedan and the ClassicUO Community



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