ModernUO Emulator
d4531cd94b
Fixes #2682. Thanks @DatMoshu for the detailed report and repro. While fixing it I audited the other map, item and multi enumerators for the same class of defect. None repeats #2682 itself, but four others turned up. All are fixed here. ## Fixes - **`StaticTileEnumerator` (#2682)**: `SetMulti` returned `SetTile()` for the first multi whose bounds contained the point. If that multi had no tile at the cell, the enumeration ended and every later multi in the sector was skipped. Movement and line of sight lost a floor that stood inside another multi's bounding box. It now moves on to the next multi. - **`MultiBoundsEnumerator`**: deduplication used one static `HashSet` that every new query cleared. A query run inside another made the outer query skip multis or return them twice. Each multi is now yielded only from the sector that holds its `Location`; the bounds filter guarantees that sector is visited. A per-enumerator set covers a multi that isn't registered in that sector (components changed after placement). Normal queries allocate nothing. - **`Item`/`Mobile`/`ClientDistanceEnumerator`**: ring sectors were bounded only by `sx >= _sectorStartX`. Ring cells past the map edge resolved to the shared invalid sector, once per cell. Entities at off-map coordinates were returned more than once, and sectors outside the query were created lazily. The check now covers all four sides. Results match the bounds enumerators, which never returned off-map entities. - **`BaseBoat.MovingEntitiesEnumerator`**: `GetMovingEntities` handles a null map, but the enumerator constructor still called `boat.Map.GetMobilesInBounds` and threw. A boat with no map now gets empty enumerators. - **`BaseDoor.ChainEnumerator`**: the walk stopped only on returning to the start door. Links are set in pairs, so `[ChainLink A B C` followed by `[Link B C` leaves A→B→C→B, and enumerating that chain never ended. The walk now stops on any door it has already yielded. Only reachable when `UseChainedFunctionality` is true, which is off in base and in all shipped content. ## Testing - A regression test for each fix except the boat null guard. Each failed before its fix and passes after. - Server.Tests 910/910. UOContent.Tests 1185 passed, 2 skipped. - Test note: the `MultiComponentList(List<MultiTileEntry>)` constructor drops entries after the first whose `Flags` are 0. The new test multis use non-zero flags. |
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| AGENTS.md | ||
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| FAQ.md | ||
| GEMINI.md | ||
| global.json | ||
| LICENSE | ||
| ModernUO.slnx | ||
| publish.cmd | ||
| publish.ps1 | ||
| publish.sh | ||
| README.md | ||
| rider-settings.zip | ||
| Rules.ruleset | ||
| SPONSORS.md | ||
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ModernUO 
Ultima Online Server Emulator for the modern era!
Requirements
Supported Operating Systems
Required Frameworks
All Operating Systems
Windows
Hardware
| Use | vCPU | RAM | Storage |
|---|---|---|---|
| Development / test | 2 dedicated | 2 GB | SSD |
| Small live shard (< 50 concurrent) | 4 dedicated | 4 GB | NVMe |
| Medium (50–200) | 4–8 | 8 GB | NVMe |
| Large (200+) | 8+, high clock | 16 GB+ | NVMe |
See dev-docs/server-requirements.md for more information.
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
Interactive Mode (Recommended for new users)
Run ./publish.cmd (Windows) or ./publish.sh (Linux/macOS) with no arguments to launch the guided build tool. It will:
- Check prerequisites (.NET SDK, native libraries)
- Walk you through configuration and platform selection
- Build and publish the server to the
Distributiondirectory - Show deployment instructions for cross-compiled builds
Command Line
./publish.cmd [release|debug] [os] [arch]
os- Supported operating systemsarchx64- Intel/AMD 64-bitarm64- ARM 64-bit
Linux Prerequisites
Fedora, CentOS, RHEL, AlmaLinux, Rocky, etc
dnf upgrade --refresh -y
# RHEL-family distributions (CentOS Stream, AlmaLinux, Rocky, RHEL) need CRB and EPEL enabled.
# Fedora skips this block.
dnf install -y dnf-plugins-core
dnf config-manager --set-enabled crb
dnf install -y epel-release
# Prerequisites
dnf install -y findutils libicu libdeflate libargon2 tzdata
Ubuntu, Debian, etc
apt-get update -y
# The ICU runtime package carries the ABI version in its name (libicu74, libicu76, …) and has no
# stable alias, so match it by pattern rather than pinning a release-specific name.
apt-get install -y '^libicu[0-9]+$' libdeflate0 libargon2-1 tzdata
Only the runtime libraries are needed — the -dev/-devel packages are not. Run
./build-tool --check-prereqs to check the current machine and print the exact packages your
release needs.
zstd is not listed because ZstdNet bundles libzstd for every platform, and liburing is not
listed because IORingGroup issues io_uring syscalls directly.
If the shard's configured time zone is a legacy alias such as US/Eastern, Debian 12 and Ubuntu
24.04 also need tzdata-legacy. See Platform Prerequisites
for what each dependency is for and what breaks without it.
OSX Requirements
brew install icu4c libdeflate argon2
Running the Server
- Follow the publish instructions
- The
Distributiondirectory is portable — copy it to your production server for deployment - Run
ModernUO.exeordotnet ModernUO.dllfrom theDistributiondirectory - On first run, the server will prompt you to configure game data file locations
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
Development Tools & Plugins provided with ♥ by
Code Signing Policy
Free code signing provided by SignPath.io, certificate by SignPath Foundation.
This program will not transfer any information to other networked systems unless specifically requested by the user or the person installing or operating it
Teams & Roles
Approvers & Committers: Development Team