Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
c-sharpcsharpcsharp-coredotnetdotnet-coreemulatorgplgplv3mmommo-enginemmorpgmmorpg-serveronlinerpgrunuoserverservuoultimaultima-onlineuo
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Creatures now run two clocks: the think clock (ActiveSpeed/PassiveSpeed, seconds per decision - unchanged in meaning, storage, and cadence) and a new movement clock (ActiveMoveSpeed/PassiveMoveSpeed, seconds per step, 0 = inherit the matching think value). This lets movement pace be tuned freely - e.g. toward RunUO's TransformMoveDelay pacing - without touching reaction time, spell timing, or acquisition cadence. - BaseCreature: move-speed pair seeded from npc-speeds.json (optional activeMove/passiveMove per bucket), [props-tunable per instance (0 to re-inherit), serialized (v22). SetSpeed keeps its legacy one-clock semantics: it sets the think clock AND clears move overrides, so existing callers cannot half-configure a creature; SetMoveSpeed/ClearMoveSpeed configure movement explicitly. CurrentMoveSpeed resolves by classifying CurrentSpeed - a verbatim active/passive value maps to the matching move value, while bespoke paces written directly (mount boosts, follow sprint) stay fused to both clocks, so external CurrentSpeed writers keep working untouched. - Movement budget: one step consumes a full step of movement-clock budget, accumulative with RunUO's snap-to-now clamp, so long-run pacing averages CurrentMoveSpeed exactly and a stall banks at most one step of catch-up. - AITimer: dual-deadline scheduling. Decisions run at the think cadence exactly as before; while a pursuit or investigation is live, the timer also wakes when the movement budget elapses and advances the step without running decisions. Steps no longer snap to the think grid, so any step delay paces smoothly on the 8ms timer wheel - no ping-pong stutter from incommensurate values. A blocked creature schedules no move wakes and stays think-paced. - Move intent: ApproachTarget/MoveToPoint record their durable goal each en-route tick; arrival, failure, give-up, action changes, or missed renewals clear it. - Badly-hurt slowdown now inflates the step delay only (RunUO parity) and is computed from the base each step. Previously it wrote CurrentSpeed back onto itself, compounding unboundedly while hurt and slowing decisions too. No behavior changes by default: with no bucket or per-instance move values, both clocks carry identical values and creatures pace as before. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> |
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| Projects | ||
| tools | ||
| .cursorrules | ||
| .editorconfig | ||
| .gitattributes | ||
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| AGENTS.md | ||
| azure-pipelines.yml | ||
| CLAUDE.md | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| Directory.Build.props | ||
| FAQ.md | ||
| GEMINI.md | ||
| global.json | ||
| LICENSE | ||
| ModernUO.slnx | ||
| publish.cmd | ||
| publish.ps1 | ||
| publish.sh | ||
| README.md | ||
| rider-settings.zip | ||
| Rules.ruleset | ||
| SPONSORS.md | ||
| stylecop.json | ||
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| version.json | ||
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