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World XR Sandbox

Portfolio Project: Multiplayer Augmented Reality application demonstrating advanced networking, real-time synchronization, and cross-platform mobile development

A production-ready XR application enabling multiple users to collaboratively interact with AR objects in shared physical space. Built with Unity, C#, Photon Networking (PUN 2), and AR Foundation, this project showcases expertise in real-time multiplayer systems, augmented reality development, and mobile application architecture.

example1

🎯 Key Technical Achievements

  • Real-Time Multiplayer Networking: Implemented room-based architecture using Photon Unity Networking 2 (PUN 2) for seamless multi-user collaboration
  • AR Object Synchronization: Developed synchronized object manipulation system allowing users to create, move, rotate, and scale 3D objects with real-time updates across all connected clients
  • Cross-Platform AR Development: Built for Android devices using Unity's AR Foundation and ARCore
  • Scalable Architecture: Designed modular C# codebase following Unity best practices for maintainability and extensibility
  • State Management: Implemented custom room properties and player state synchronization using Photon's callback system

💻 Technologies & Skills Demonstrated

Core Technologies

  • Unity 2020.3 - Game engine and XR framework
  • C# / .NET - Primary programming language for all application logic
  • Photon Unity Networking 2 (PUN 2) - Real-time multiplayer networking framework
  • AR Foundation / ARCore - Augmented reality platform for Android
  • Mixed Reality Toolkit (MRTK) - UI/UX framework for XR applications

Technical Skills

  • Real-time networked multiplayer systems
  • Client-server architecture and synchronization
  • Object-oriented programming and design patterns
  • Mobile AR development and optimization
  • Unity scene management and lifecycle
  • Network state management and custom properties
  • Cross-platform mobile deployment (Android APK builds)

📝 Project Overview

Originally developed as a capstone project in partnership with SphereGen (mixed reality consultancy), this application was designed to explore the intersection of augmented reality and real-time networking. The project demonstrates practical implementation of enterprise-grade multiplayer AR experiences.

Core Features

  • Host/Join System: Create or join multiplayer AR rooms with unique room IDs
  • Real-Time Object Manipulation: Instantiate and manipulate 3D AR objects visible to all users
  • Synchronized Transforms: Position, rotation, and scale updates propagated across all clients
  • Player Management: Handle multiple concurrent users with proper connection/disconnection handling

🏗️ Architecture & Implementation

Networking Layer

  • Implemented using Photon PUN 2 for reliable real-time communication
  • Custom room creation system with auto-generated unique room IDs
  • Master client architecture for authoritative game state
  • Automatic scene synchronization across all connected clients
  • Custom properties system for shared room state

AR Implementation

  • ARCore integration for Android device tracking and plane detection
  • Camera-relative object spawning for intuitive AR placement
  • Real-time transform synchronization using PhotonView components
  • Optimized for mobile performance with efficient networking protocols

Code Architecture

Key Components:
├── Launcher.cs          → Connection management and room operations
├── RoomManager.cs       → Room lifecycle and player callbacks
├── ObjectManager.cs     → AR object instantiation and management
└── PlayerNameInputField → User identification and preferences

🚀 Getting Started

Prerequisites

  • Android device with ARCore support
  • Camera permissions enabled

Installation

  1. Download the latest APK from Releases
  2. Install on ARCore-compatible Android device
  3. Grant camera permissions when prompted

Usage

Host Mode: Create a new multiplayer session

  • Enter your name
  • Tap "Host" to create a room
  • Share the generated Room ID with others

Join Mode: Connect to an existing session

  • Enter your name
  • Input the Room ID provided by host
  • Tap "Join" to connect

Once connected, tap to place and manipulate 3D objects in AR space—all changes are synchronized in real-time across all connected users.

📦 Dependencies & Frameworks

Technology Purpose Version
Unity Game engine and AR platform 2020.3.10f1
Photon Unity Networking 2 (PUN 2) Real-time multiplayer framework Latest
Mixed Reality Toolkit (MRTK) XR UI/UX components 2.7.2
AR Foundation Cross-platform AR abstraction 4.1.7
ARCore XR Plugin Android AR implementation 4.1.7
TextMesh Pro Advanced text rendering 3.0.6

👥 Development Team & Acknowledgments

Developers:

Mentor:

  • Eric Wilson - Mixed Reality Developer at SphereGen

Partnership: This project was developed in collaboration with SphereGen, a mixed reality consultancy, who provided concept development, technical mentorship, and industry best practices guidance throughout the development cycle.

🔧 Technical Highlights for Recruiters

This project demonstrates proficiency in:

  • ✅ C# / .NET Development - Clean, maintainable object-oriented code
  • ✅ Real-Time Networking - Multiplayer synchronization and state management
  • ✅ Mobile Development - Android deployment with performance optimization
  • ✅ Augmented Reality - ARCore integration and spatial computing
  • ✅ Unity Engine - Scene management, prefab systems, and component architecture
  • ✅ Problem Solving - Handling network latency, state synchronization, and cross-platform compatibility
  • ✅ Collaboration - Worked with industry mentor and partner organization
  • ✅ Version Control - Git workflow and collaborative development

📊 Project Status

Current Version: v1.0 (MVP)

This MVP implementation includes:

  • ✅ Functional room host/join system
  • ✅ Real-time object creation and manipulation
  • ✅ Multi-user synchronization
  • ✅ Android deployment pipeline

Future Enhancement Opportunities:

  • Persistent object anchoring (with alternative to deprecated Azure Spatial Anchors)
  • Advanced gesture controls and interactions
  • Voice chat integration
  • iOS platform support
  • Enhanced UI/UX with more MRTK components
  • Performance optimizations for larger rooms

📄 License

This is a portfolio project demonstrating technical capabilities in XR development and real-time networking.

Note: This project previously utilized Azure Spatial Anchors for persistent world anchoring, which has been deprecated by Microsoft. The current implementation focuses on session-based multiplayer AR without persistent anchors.