With the creation of the new Mixed Reality Toolkit organization, there now exists two MRTK repositories,
one repository for version 3+ and a legacy one for version 2.
New versions of the Mixed Reality Toolkit will be released by the Mixed Reality Toolkit organization using a repository at https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity. Visit this repository for the latest version of the MRTK project, and when creating new issues or discussion topics for MRTK version 3 or later.
MRTK v2 (Legacy)
The old MRTK2 repository, https://github.com/microsoft/MixedRealityToolkit-Unity, is remaining under Microsoft's management and will stay on version 2. Microsoft is committed to the next version of MRTK, and recommends applications move to MRTK version 3 or later. However, Microsoft will continue to support and address critical MRTK2 issues, until MRTK2 is deprecated. Please open MRTK2 issues and discussion topics using the old repository.
What is the Mixed Reality Toolkit
MRTK-Unity is a Microsoft-driven project that provides a set of components and features, used to accelerate cross-platform MR app development in Unity. Here are some of its functions:
- Provides the cross-platform input system and building blocks for spatial interactions and UI.
- Enables rapid prototyping via in-editor simulation that allows you to see changes immediately.
- Operates as an extensible framework that provides developers the ability to swap out core components.
- Supports a wide range of devices:
|XR SDK Plugin (Unity XR Plugin Management Providers)||Supported Devices|
|Unity OpenXR Plugin (Unity 2020 or 2021 LTS)
(Mixed Reality OpenXR Plugin required for certain features on certain devices)
|Microsoft HoloLens 2
Windows Mixed Reality headsets
Device running on SteamVR via OpenXR
|Windows XR Plugin||Microsoft HoloLens
Microsoft HoloLens 2
Windows Mixed Reality headsets
|Oculus XR Plugin (Unity 2019 or newer LTS)||Meta Quest (via Oculus Integration Package)|
|ARCore XR Plug-in||Android (via AR Foundation)|
|ARKit XR Plug-in||iOS (via AR Foundation)|
Additional devices supported:
- Ultraleap Leap Motion controller for hand tracking (via Ultraleap's OpenXR API layer (recommended) or via Ultraleap's Plugin for Unity)
|NOTE: We have introduced the public preview of MRTK3, the next chapter of MRTK. For documentation, please go to the MRTK3 documentation. For code, please go to the mrtk3 branch.|
Getting started with MRTK
If you're new to MRTK or Mixed Reality development in Unity, we recommend you start at the beginning of our Unity development journey in the Microsoft Docs. The Unity development journey is specifically tailored to walk new developers through the installation, core concepts, and usage of MRTK.
|IMPORTANT: The Unity development journey currently uses MRTK version 2.8.2, Mixed Reality OpenXR plugin version 1.6.0 and Unity 2020.3.42+.|
If you're an experienced Mixed Reality or MRTK developer, check the links in the next section for the newest packages and release notes.
Starting from MRTK 2.6, we are publishing both conceptual docs and API references on docs.microsoft.com. For conceptual docs, please visit our new landing page. For API references, please visit the MRTK-Unity section of the dot net API explorer. Existing content will remain here but will not be updated further.
|Branch||CI Status||Docs Status|
|Windows SDK||Unity 2018/2019/2020 LTS||Visual Studio 2019||Emulators (optional)|
Please refer to the Install the tools page for more detailed information.
UX building blocks
|Button||Bounds Control||Object Manipulator|
|A button control which supports various input methods, including HoloLens 2's articulated hand||Standard UI for manipulating objects in 3D space||Script for manipulating objects with one or two hands|
|2D style plane which supports scrolling with articulated hand input||Example script of using the system keyboard in Unity||A script for making objects interactable with visual states and theme support|
|Various object positioning behaviors such as tag-along, body-lock, constant view size and surface magnetism||Script for laying out an array of objects in a three-dimensional shape||Annotation UI with a flexible anchor/pivot system, which can be used for labeling motion controllers and objects|
|Slider||MRTK Standard Shader||Hand Menu|
|Slider UI for adjusting values supporting direct hand tracking interaction||MRTK's Standard shader supports various Fluent design elements with performance||Hand-locked UI for quick access, using the Hand Constraint Solver|
|App Bar||Pointers||Fingertip Visualization|
|UI for Bounds Control's manual activation||Learn about various types of pointers||Visual affordance on the fingertip which improves the confidence for the direct interaction|
|Near Menu||Spatial Awareness||Voice Command / Dictation|
|Floating menu UI for the near interactions||Make your holographic objects interact with the physical environments||Scripts and examples for integrating speech input|
|Progress Indicator||Dialog [Experimental]||Hand Coach|
|Visual indicator for communicating data process or operation||UI for asking for user's confirmation or acknowledgement||Component that helps guide the user when the gesture has not been taught|
|Hand Physics Service [Experimental]||Scrolling Collection||Dock [Experimental]|
|The hand physics service enables rigid body collision events and interactions with articulated hands||An Object Collection that natively scrolls 3D objects||The Dock allows objects to be moved in and out of predetermined positions|
|Eye Tracking: Target Selection||Eye Tracking: Navigation||Eye Tracking: Heat Map|
|Combine eyes, voice and hand input to quickly and effortlessly select holograms across your scene||Learn how to auto-scroll text or fluently zoom into focused content based on what you are looking at||Examples for logging, loading and visualizing what users have been looking at in your app|
|Optimize Window||Dependency Window||Build Window||Input recording|
|Automate configuration of Mixed Reality projects for performance optimizations||Analyze dependencies between assets and identify unused assets||Configure and execute an end-to-end build process for Mixed Reality applications||Record and playback head movement and hand tracking data in editor|
Explore MRTK's various types of interactions and UI controls through the example scenes. You can find example scenes under Assets/MRTK/Examples/Demos folder.
MRTK examples hub
With the MRTK Examples Hub, you can try various example scenes in MRTK. On HoloLens 2, you can download and install MRTK Examples Hub through the Microsoft Store app.
See Examples Hub README page to learn about the details on creating a multi-scene hub with MRTK's scene system and scene transition service.
Sample apps made with MRTK
|Periodic Table of the Elements is an open-source sample app which demonstrates how to use MRTK's input system and building blocks to create an app experience for HoloLens and Immersive headsets. Read the porting story: Bringing the Periodic Table of the Elements app to HoloLens 2 with MRTK v2||Galaxy Explorer is an open-source sample app that was originally developed in March 2016 as part of the HoloLens 'Share Your Idea' campaign. Galaxy Explorer has been updated with new features for HoloLens 2, using MRTK v2. Read the story: The Making of Galaxy Explorer for HoloLens 2||Surfaces is an open-source sample app for HoloLens 2 which explores how we can create a tactile sensation with visual, audio, and fully articulated hand-tracking. Check out Microsoft MR Dev Days session Learnings from the Surfaces app for the detailed design and development story.|
Session videos from Mixed Reality Dev Days 2020
See Mixed Reality Dev Days to explore more session videos.
Engage with the community
Ask questions about using MRTK on Stack Overflow using the MRTK tag.
For questions about contributing to MRTK, go to the mixed-reality-toolkit channel on slack.
Useful resources on the Mixed Reality Dev Center
|Learn to build mixed reality experiences for HoloLens and immersive headsets (VR).||Get design guides. Build user interface. Learn interactions and input.||Get development guides. Learn the technology. Understand the science.||Get your app ready for others and consider creating a 3D launcher.|
Useful resources on Azure
|Spatial Anchors is a cross-platform service that allows you to create Mixed Reality experiences using objects that persist their location across devices over time.||Discover and integrate Azure powered speech capabilities like speech to text, speaker recognition or speech translation into your application.||Identify and analyze your image or video content using Vision Services like computer vision, face detection, emotion recognition or video indexer.|
Learn more about the MRTK project
You can find our planning material on our wiki under the Project Management Section. You can always see the items the team is actively working on in the Iteration Plan issue.
How to contribute
Learn how you can contribute to MRTK at Contributing.
For details on the different branches used in the Mixed Reality Toolkit repositories, check this Branch Guide here.