Conceptual Architecture Team OMG Who we are: Nelson Yi Joshua Lee - PowerPoint PPT Presentation

CISC 326 Group OMG Conceptual Architecture

Team OMG Who we are: • Nelson Yi • Joshua Lee • Hassan Haq • Simon Zhang • Andy Chu • Percy Teng

Presentation Overview 1. Introduction 2. Reference Architecture 3. Derivation Process 4. Conceptual Architecture 5. Components 6. Use Cases 7. Game Engine 8. Conclusion 9. Q/A

What’s so special about DOOM III? Doom 3 is a 2004 video game developed by id Software. The game was developed using the id Tech 4 engine, a game engine also made by id Software specifically for Doom 3. Written in C++ Platforms: developed for Windows ported to Linux, Mac OS X, Xbox

Amazing id Tech 4 Engine!

Reference Architecture

Main components: Game Engine • Game Data • Hardware • User Interface •

Reference Architecture Revised

Derivation Process Look at Reference Architectures for 3D First Person • Shooter video games in general, and other similar games Research different components of Doom 3 including id • Tech 4 Identify the dependencies between these components • Put it all together •

Main components: Game Engine: User Interface • • Input Engine • Game Data - Command System • Hardware - Event Handler • Network - Artificial Intelligence • World - Physics Engine • Audio - Sound Engine • Video - Graphics Engine (Renderer) -

Main components: Game Engine: User Interface • • Input Engine • Game Data - Command System • Hardware - Event Handler • Network - Artificial Intelligence Discarded Alternatives: - Physics Engine - • World Sound Engine - • Audio Graphics Engine (Renderer) - • Video

Derived Architecture

What does the system do and what is its functionality? UI->command system -> subsequent interacting functions. Rendering system for graphics, event handler for triggering executions, file system for data storage structure, networking system for communication. How it is broken into interacting parts? Game Engine System Networking System Database System

What are the parts? And how do they interact?

Why Object Oriented Style? Pros: Integrity of data operations -> Addresses stability and security. Critical for an AAA game. Cons: The first object must know the identity of the second • object Objects can cause side effect problems •

Concurrency Networking system and Game Engine concurrently work together • to produce computations and data accesses, must be simultaneous • The Rendering Engine and Sound Engine also work concurrently together. Both would produce the outcomes into the UI and Hardware component at the same time (Sound, Visuals happen CONCURRENTLY)

Use case: shooting a monster

Use case: shooting a monster

Use case: saving the game

Sequence Diagram for Saving Game

Networking Uses Client Prediction to deal with lag • 1 computer is the server, all player computers are clients • clients send input to servers, server sends back latest • snapshot Uses delta compression to save bandwidth •

Lessons learned Game architectures requires a deep understanding of • genuine architectures and its sub-components and how they interact in various situations Depending on the function that is being focused on, the • flow between components can be very different and so the setup of components within the architecture is key.

Conclusion Doom 3 utilizes Object-Oriented Architectural style • Reference Architecture and Conceptual Architecture are • quite similar The Key Component that ties together the Architecture is • the Command System which deals with the information provided from the Network, Hardware and the Game Data server Incorporation of Client Server and Peer-Peer interaction • relied on a risky but high reward architecture.

Q&A