How to Integrate a Customized GPT into UE5 VR Project?

Development Programming & Scripting Blueprint
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1

Hello everyone,

I’m seeking advice on integrating a customized GPT(under MyGPTs) into a VR project built with Unreal Engine 5. My key objectives are:

  • Connecting the GPT model with Unreal Engine to facilitate real-time interaction.
  • Handling voice input/output for natural communication within the VR environment.
  • Triggering Unreal Engine events (e.g., animations, music) based on GPT responses.

If anyone has experience with similar setups or can point me to relevant tools, plugins, or workflows, I’d greatly appreciate your help.

Thank you!

2

Integrating a customized GPT (under MyGPTs) into an Unreal Engine 5 VR project for real-time interaction can be broken down into several key components:

1. Connecting GPT with Unreal Engine

  • REST API Approach:
    OpenAI provides an API for GPT models. You can send requests from Unreal Engine using:
    • UE5’s HTTP module (FHttpModule) to send/receive data.
    • Blueprints (WebSocket or HTTP Requests) if you prefer a no-code approach.
    • Python Plugin for UE to communicate with the OpenAI API.
  • Local Model (Optional):
    If you want to run a local LLM (e.g., Llama, Mistral), consider:
    • Running Ollama locally and using Unreal’s Python scripting for communication.
    • Using Socket.IO or ZeroMQ for faster interaction.

2. Handling Voice Input/Output

  • Speech-to-Text (Voice Input)
    • Use Windows Speech Recognition API or Google Cloud Speech-to-Text.
    • MetaSpeech Plugin for UE5 (supports real-time speech recognition).
    • Whisper API (OpenAI) for highly accurate transcription.
  • Text-to-Speech (Voice Output)
    • Unreal Engine supports Amazon Polly, Google TTS, or OpenAI’s TTS.
    • Use MetaVoice for expressive AI-driven voice synthesis.
    • UE5 Sound System: Convert TTS responses to in-game audio.

3. Triggering Unreal Engine Events from GPT Responses

  • Keyword Matching: Parse GPT responses and trigger actions based on keywords (e.g., “play music,” “open door”).
  • JSON Structured Responses: Ask GPT to output structured JSON (e.g., { "action": "play_animation", "name": "wave" }) and parse it in UE5.
  • Blueprint Integration:
    • Create an AI Controller that listens for GPT responses.
    • Use Gameplay Tags or Event Dispatchers to trigger animations.

Recommended Tools & Plugins

  • VA Plugin (Virtual Assistant) for UE5 – Handles voice interaction.
  • MetaHuman Speech SDK – Realistic speech synthesis for avatars.
  • Blueprint JSON Parser – Helps structure GPT responses for better integration.
  • WebSockets Plugin – For real-time communication with external AI services.

Example Workflow

  1. Player speaks into a VR microphone.
  2. Audio is converted to text using Whisper API.
  3. The text is sent to GPT API, which processes it.
  4. GPT’s response is:
  • Displayed as subtitles.
  • Converted to speech via TTS.
  • Parsed to trigger UE5 animations/music/etc..

Would you like code examples for any of these parts? :rocket:

3

I’m looking to implement something similar, did you find the best way to do it?

4

Hi! I followed the tutorial on Metahuman AI lip-sync ( MetaHuman AI Lip Sync with Local Text-to-Speech in UE 5.6+ | Community tutorial ) *with local text-to-speech in UE 5.6. My current setup can capture microphone input and display it as text, and the character can speak from a text field. What I’m missing is connecting this text to a GPT model to generate dynamic responses. Could you guide me on best practices for integrating a custom GPT (local or cloud) so the generated text feeds directly into the Metahuman TTS workflow in UE5 VR?

can you show how to take the text that is converted from the VR microphone and generate a response using any gpt local or API based?
Thank you!*