Dissertation Project

Evaluating NPC Dialogue Interaction Methods in Video Games

Project Overview

This research project aimed to evaluate the effectiveness of different NPC dialogue interaction methods in video games. The project incorporated a novel method of interaction using NLP and LLM AI tools and technology within Unity. I successfully implemented conventional NPC dialogue interaction methods, conducted user research, and explored open & closed domain dialogue generation systems.

Key Features

Implemented conventional branching dialogue system
Developed experimental NLP and LLM-based interaction methods
Created a "who dunnit?" style detective game in Unity
Conducted user research and playtesting
Analyzed effectiveness of different dialogue systems

Technology Used

C#
Unity Game Engine
Python
spaCy NLP library
OpenAI's ChatGPT API

Achievements

The project successfully incorporated both conventional and experimental NPC dialogue interaction methods. The branching dialogue system allowed for interactive and multi-path conversations, while the NLP and LLM-based methods provided players with a heightened degree of agency and immersion. User research and playtesting feedback added valuable insights into how gamers perceive NPC interactions within games.

Challenges and Improvements

As a solo developer, meeting deadlines and incorporating all requirements within the limited development time was challenging. The effectiveness of the LLM interaction method could have been enhanced with more time. In hindsight, prioritizing the more complex experimental interaction methods and allocating more time for their development would have been beneficial.

Future Development

The project highlighted the potential of using NLP tools and techniques in NPC interaction but also emphasized the need for further development and refinement. Future work should focus on enhancing the LLM method to address issues like NPC repetition and unnatural conversation breakdowns. However, the ongoing importance of branching dialogue systems in video games is recognized, and their continued use for stable and reliable NPC interactions is recommended.