A Developer’s Guide to Conversational AI with 3D Characters

Stefan Bogdanel — Tue, 08 Apr 2025 13:55:18 +0000

Hello, developers! 🚀 Today, we’re excited to introduce 3D GPT—a project that blends AI, voice interaction, and 3D visualization to create immersive conversational experiences. Whether you’re a hobbyist or a seasoned developer, this demo showcases how to bring characters to life in a browser with ease. Let’s dive into the details!

What is 3D GPT?

3D GPT is a technical demonstration of how AI-driven 3D characters can interact with users through natural voice conversations. It lets you:

Import VRM-formatted 3D models (a popular format for virtual characters).
Customize voice settings to match your character’s persona.
Generate dynamic responses with emotional expressions for lifelike interactions.

Core Features & Technologies

The magic of 3D GPT lies in its integration of cutting-edge tools:

Voice Recognition

Powered by the Web Speech API, the app converts your spoken words into text, enabling real-time interaction.
AI-Powered Text Generation

Responses are generated using Ollama API (running on CPU inference), which leverages the ChatGPT API under the hood. This ensures context-aware, emotionally rich dialogues.
Text-to-Speech (TTS)

The Conqua TTS API (via Audio API) transforms AI-generated text into natural-sounding speech, complete with tone adjustments.
3D Character Rendering

Built with @pixiv/three-vrm, a library for rendering VRM models in Three.js, characters are displayed with smooth animations and expressions.

Getting Started: Run 3D GPT Locally

Ready to experiment? Here’s how to set up the project:

Clone the Repository

   git clone git@github.com:izdrail/agent.izdrail.com

Install Dependencies

   npm install

Start the Development Server

   npm run dev

Access the App Open your browser to http://localhost:1603 and start chatting with your 3D character!

Explore the Demo

Not ready to code? Try the live demo on Glitch:

👉 3D GPT Demo

APIs & Services to Explore

Ollama API: For AI text generation. Learn more about its capabilities and integration.
Conqua TTS: For high-quality text-to-speech. Check out the Audio API documentation for customization options.

Why This Matters

3D GPT isn’t just a demo—it’s a playground for innovation. Imagine:

Virtual assistants with personality.
Educational avatars for immersive learning.
Gaming characters that adapt to your emotions.

By combining open-source libraries and APIs, this project lowers the barrier to creating next-gen interactive experiences.

Join the Journey

We’d love for you to:

Fork the repo and tweak it to your needs.
Share your creations with the community.
Report issues or suggest features on GitHub.

Let’s push the boundaries of what’s possible with AI and 3D tech! 🌐✨

Happy coding!

The 3D GPT Team

DEV Community: Stefan Bogdanel