Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
c-sharpcsharpcsharp-coredotnetdotnet-coreemulatorgplgplv3mmommo-enginemmorpgmmorpg-serveronlinerpgrunuoserverservuoultimaultima-onlineuo
4bbc4589e7
The pathing and step-cache comments had accumulated as development notes rather
than documentation: internal phase jargon ("Tier 4", "the Phase-2 synthesizer"),
change narration aimed at a reviewer ("which the old ComputeStandingZ anchor
missed", "legacy behavior"), benchmark anecdotes ("benchmarked as near-optimal",
"a ~20 ns lookup"), and multi-paragraph blocks restating what the code says.
Rewritten to keep the rationale a reader cannot derive from the code - why the
source-Z guard cannot be loosened, why multis fall through, why the promotion gate
counts Finds instead of calls, why the fingerprint hashes files rather than the
live tile tables - and to drop the history that got us there.
Also corrects comments that had gone stale:
- CacheEvictionTimer and CacheStats documented a class named
StaticWalkabilityCache, which no longer exists; it is StepCache.
- StepCacheFile's header said "File layout v8" while FormatVersion is 9, and the
body called the current record layout "the v6 layout" throughout. The layout
descriptions are now unversioned, since they describe whatever FormatVersion
currently is.
- StepProbe.ComputeStandingZ claimed StepCache uses it to bake SourceZ. It hasn't
since the baker moved to the clearance-aware ComputeStandableSurfaceZs; only a
parity test calls it now.
Two small code changes came along with the comment work, both behavior-preserving:
_lazyReaders now uses a collection expression like its neighbours, and
TryLoadFromLazyReader collapses to an expression body once its inline comment moved
to the doc comment.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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| FAQ.md | ||
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| LICENSE | ||
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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
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, 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 liburing-devel
Ubuntu, Debian, etc
apt-get update -y
apt-get install -y libicu-dev libdeflate-dev zstd libargon2-dev liburing-dev
OSX Requirements
brew install icu4c libdeflate zstd 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