HoloBot is a reusable 3D interface that allows HoloLens & VR users to interact with any bot using Mixed Reality & Speech.
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Take your bots beyond Skype, Slack, Microsoft Teams and Facebook and bring them into the real world with Mixed Reality. Why simply type-chat with a bot when you could actually look at them, talk to them and listen to their answers?

HoloBot is reusable Windows Mixed Reality Unity project for Microsoft HoloLens and immersive VR headsets that acts as a holographic client for a chatbot. This 3D app lets you interact with a floating robot head using speech recognition, getting answers spoken back by the "bot" using Text-to-Speech. The commands sent to the bot are powered by the Microsoft Bot Framework and LUIS from Microsoft Cognitive Services.

  • Unity version: 2017.2.1p2
  • Mixed Reality Toolkit (MRTK) version: 2017.2.1.1 patch release

Note for Unity 5.x users: Now that HoloBot has been upgraded to Unity 2017.2, I have archived the previous version for Unity 5.6.3p2 in a separate dev branch (download Unity 5.6.3p2 here). Note that this legacy version of HoloBot is only provided for archival purposes and this branch will no longer be worked on.

To get started with HoloLens & Windows Mixed Reality development, visit the Windows Mixed Reality Dev Center. The HoloLens Developer Kit is available for sale in several countries at http://hololens.com.


  • Hovering bot head (aka HoloBot) with looping ambient sound.
  • Tap & hold the HoloBot to drag it to a different location, drop the hold to place.
  • Gaze at the HoloBot to trigger the speech recognizer, you will hear a "ping" sound.
  • Speak "commands" to HoloBot using natural language. HoloBot has only been tested with English for now.
  • The HoloBot speaks back to you using Speech Synthesis (aka Text-to-Speech, or TTS).
  • All sounds and speech use spatial sound that originate from the HoloBot's location in the room.
  • The "brain" of HoloBot can be any public bot built with the Microsoft Bot Framework. Build your Bot using C# or Node. See bot integration instructions below.

Video Demonstration


The bot demonstrated in this video is The Maker Show Bot, also found here on GitHub. Feel free to fork the code and plug HoloBot to your own chatbot.

Instructions / Implementation Notes

  • The HoloBot model and sounds come from the Holographic Academy tutorial: [Holograms 240: Sharing Holograms].(https://developer.microsoft.com/en-us/windows/holographic/holograms_240).
  • HoloBot has finally been upgraded to a recent version of the HoloToolkit for Unity. See above for the specific version.
  • Uses the InputManager from MRTK for Unity (prefab) for Gaze & Gesture management.
  • Now using the Hand Draggable script instead of my own custom Tap to Place.
  • MicrophoneManager.cs now implements IFocusable for Gaze/Input Controller events (enter/leave), which triggers the speech recording.
  • Uses Text to Speech Manager from MRTK for Unity (Utilities scripts).
  • It is no longer needed to use your own Newtonsoft.Json.dll in the /Plugins folder of the HoloBot Unity project since the MRTK already includes it.

Connecting your Bot to HoloBot

  • Create and register your bot as per the intructions at https://dev.botframework.com. Bots can be built with C# & ASP.NET WebAPI or Javascript & Node.js. Since HoloBot uses free natural language dictation, it is highly recommended that your bot support NLP via the Language Understanding Intelligent Service (LUIS) from Microsoft Cognitive Services.
  • From the Bot Connector portal, enable the Direct Line channel on your bot, and enable version 3.0 of the Direct Line API.
  • Generate and copy your Direct Line secret (aka API key)
  • Open BotService.cs in the /Scripts folder of the HoloBot Unity project and paste your Direct Line secret in the _APIKEY private string



I want to offer special thanks to the following people who have helped me in building this project:

  • Jarez Bienz, for the Text-to-Speech component that he wrote for the Mixed Reality Toolkit for Unity, and for his help in integrating my UWP Bot Framework code into Unity.
  • Kat Haris, for her awesome Unity skills and helping me with audio sources triggers.
  • Vanessa Arnauld & Sara Nagy, for being incredible holographic "enablers" :)
  • The whole Microsoft Mixed Reality Academy team & mentors - especially Pat - for their awesome training, resources, patience and help.

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