Nine Realities Netcode Model v3.0

Production-ready N+1 concurrent simulation framework for competitive multiplayer netcode.

Unreal Engine 5.5+ plugin with forward compatibility for UE6. Server-authoritative architecture with client-side prediction, rollback-based reconciliation, and adaptive state synchronization.

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What's New in v3.0

Unreal Engine Plugin

The N+1 model is now a production-ready Unreal Engine plugin with 15,000+ lines of C++:

Component	Class	Purpose
Manager	UN1NetcodeManager	Central orchestrator — Standalone/Client/Server/ListenServer modes
Prediction	UN1ClientPrediction	4-mode adaptive prediction (Conservative/Balanced/Aggressive/Adaptive)
Authority	UN1ServerAuthority	Authoritative sim with per-client adaptive snapshots & lag compensation
Rollback	UN1RollbackEngine	Rollback+replay with cost estimation and depth limiting
Blend	UN1BlendInterpolator	4-curve smoothing (Linear/SmoothStep/Exponential/CriticalDamping)
Clock	UN1NetworkClock	Cristian's algorithm with jitter buffering
Buffer	UN1PredictionBuffer	Ring buffer for rollback replay with contiguous validation
Reconcile	UN1ReconciliationEngine	4-strategy reconciliation (Full/Adaptive/Delta/Interpolation)

UE6 Forward Compatibility

• Runtime engine detection — auto-adapts to UE5.5+ and future UE6
• Network Snapshots V2 prepared for UE6 serialization format
• QUIC transport ready with UDP fallback
• NetworkPrediction plugin integration hooks

Modernized Documentation Site

The GitHub Pages site has been completely redesigned with:

• New Plugin tab with installation and quick-start guides
• UE6 Ready tab with compatibility matrix and migration path
• Enhanced interactive simulations
• Responsive card-based design

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Quick Start

Plugin Installation

# Copy the plugin into your UE project's Plugins folder
cp -r NineRealitiesNetcode /YourProject/Plugins/

# Rebuild your project — the plugin auto-registers

C++ Quick Start

#include "Core/N1NetcodeManager.h"

// Create and configure
auto* N1 = UN1NetcodeManager::GetN1Manager(GetWorld());
FN1NetcodeConfig Config;
Config.ClientTickRate = 120;
Config.ServerTickRate = 120;
Config.bAdaptivePrediction = true;
N1->Initialize(Config, EN1NetcodeMode::Server);

Blueprint Quick Start

1. Search "N1 Netcode Manager" in the Blueprint editor
2. Call Initialize with your FN1NetcodeConfig
3. Bind to OnPhaseChanged and OnDivergenceDetected events
4. Read FN1SimulationMetrics for real-time performance data

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The N+1 Model

In any networked game with N players and 1 server, there exist N+1 concurrent but divergent simulations of the same game state:

• N client realities: Each player runs local prediction for responsive gameplay
• +1 server reality: The authoritative simulation that validates fairness

The "truth" emerges through continuous reconciliation between these competing realities.

Pipeline: Prediction → Rollback → Blend

Local Input → Client Prediction → Render
                     ↓
              Server Snapshot
                     ↓
         Detect Divergence
                     ↓
    [Within Threshold] → Continue
    [Exceeds Threshold] → Rollback → Replay Inputs → Blend → Render

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Repository Structure

NineRealitiesNetcode/           # UE Plugin (NEW in v3.0)
├── NineRealitiesNetcode.uplugin
├── Source/
│   ├── NineRealitiesNetcode/        # Runtime module
│   │   ├── Public/
│   │   │   ├── Core/                # Manager, State, Clock, Buffer
│   │   │   ├── Pipeline/            # Prediction, Authority, Rollback, Blend, Reconcile
│   │   │   └── UE6/                 # Forward compatibility layer
│   │   └── Private/                 # Implementation files
│   └── NineRealitiesNetcodeEditor/  # Editor module
├── docs/                        # GitHub Pages site
├── examples/                    # Pseudocode and JS examples
├── paper/                       # Technical analysis (DOCX)
├── PERFORMANCE.md               # Benchmarks and analysis
├── ROADMAP.md                   # Future plans
└── CHANGELOG.md                 # Version history

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Architecture

N+1 Concurrent Simulations

flowchart LR
  subgraph Clients["N Client Realities"]
    C1[Client 1 Predicted Sim]
    C2[Client 2 Predicted Sim]
    Cn[Client N Predicted Sim]
  end
  S[(Server Authoritative Sim)]

  C1 -- inputs --> S
  C2 -- inputs --> S
  Cn -- inputs --> S
  S -- snapshots --> C1
  S -- snapshots --> C2
  S -- snapshots --> Cn

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Plugin Module Graph

flowchart TD
  A[N1NetcodeManager] --> B[N1ClientPrediction]
  A --> C[N1ServerAuthority]
  A --> D[N1ReconciliationEngine]
  A --> E[N1NetworkClock]
  B --> F[N1PredictionBuffer]
  D --> G[N1RollbackEngine]
  D --> H[N1BlendInterpolator]
  A --> I[N1UE6Compatibility]

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Documentation

• Interactive Docs: powder-ranger.github.io/nine-realities-netcode
• Performance Benchmarks: PERFORMANCE.md
• Technical Paper: /paper/Nine-Realities-Netcode-Model_-Technical-Analysis.docx
• Changelog: CHANGELOG.md
• Roadmap: ROADMAP.md

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UE6 Migration Path

Feature	UE5.5	UE6
Core Simulation	Custom implementation	Native NetworkPrediction integration
Serialization	FBitWriter + N1 extensions	FNetworkBitWriterV2
Time Sync	Cristian's algorithm	NetworkTimeSubsystem
Transport	UDP	QUIC + UDP fallback
Congestion Control	Static	Pluggable (Cubic, BBR)

Migration steps (when UE6 releases):

1. Update EngineVersion to 6.0.0 in .uplugin
2. Enable N1_UE6_BUILD in build config
3. Compatibility layer auto-switches to native APIs

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Performance

Metric	Value
Client prediction time	~0.9ms/frame
Reconciliation time	~0.6ms/frame
Rollback cost (8 frames)	~2.3ms
Bandwidth (8 players, 60Hz)	~142 kbps/client downstream
Memory (120-frame buffer)	~192 KB per entity
Quantization precision	Position: 0.01u, Rotation: ~0.002 deg

See PERFORMANCE.md for full benchmarks.

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Contributing

See CONTRIBUTING.md. This is open research — contributions, corrections, and discussions are welcome.

License

MIT License. See LICENSE.

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Built by: POWDER-RANGER (Curtis Charles Farrar)
Version: 3.0.0 | Engine: UE5.5+ / UE6 Ready
Site: powder-ranger.github.io/nine-realities-netcode