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Mixed Reality Extension Unity Integration Guide

Integrating the MRE Unity client library into your own project? Excellent choice, friend!

Files needed

You should be able to just copy the following folders into your own Unity Host App

  • MRETestBed\Assets\Assemblies
  • MRETestBed\Assets\Resources
  • MRETestBed\Assets\TestBed Assets\Scripts

And then just instantiate an MREComponent and set the URL to ws://mre-hello-world.azurewebsites.net

Verifying an Integration

We try to always have MREs deployed here for the latest master build:

  • ws://mre-hello-world.azurewebsites.net
  • ws://mre-solar-system.azurewebsites.net
  • ws://mre-functional-tests.azurewebsites.net

Run through all the tests in the functional test MRE to see if everything works.

Back compatibility and Updates

One of the most important considerations when implementing the MRE SDK into a title is compatibility. Once the MRE SDK exits beta stage, the MRE Unity client library will guarantee backwards compatiblity with old MRE protocols. This means any MRE deployed will always run. However, back compatibility only works one way. As the MRE feature set grows, any host app will need to take regular client library updates to keep up-to-date. The MRE SDK will simply reject connecting to a host app if it uses an outdated client library.

There are therefore two important host app implementation details

  • properly recognize server rejections caused by versioning, and to message to the user that they need to update their host app.
  • commit to regularly pull in an updated client library.

We have not yet established a release cadence for client libraries and SDK updates, but after exiting beta stage there will be a grace period between client library updates and matching sdk updates.

Auto-updating MREUnityRuntimeLib DLL

In the MREUnityRuntimeLib solution directory, there is a MREUnityProjects.xml file (generated automatically if it isn't found). This is used to automatically copy DLLs into a unity project's assemblies folder whenever the DLLs are recompiled. You should add an additional path (ProjectTargetDir) in the xml file, for where you want to copy the compiled DLLs.

Unknown References compiler error

If you got compiler errors (unknown references), it may be because you are using different version of Unity - no problem, but you may need to add additional hintpaths in two locations in two csproj files. Open the project file in a text editor:

  • MREUnityRuntime\MREUnityRuntimeLib\MREUnityRuntimeLib.csproj

In this file, find the tags <Reference Include="UnityEditor"> and <Reference Include="UnityEngine">. These contain absolute paths to your Unity installation directory and specific DLLs. Copy-paste new HintPath lines, filling in your specific installation's absolute paths. Currently there is a checked in version of the UnityEngine.dll in the Libraries directory so this should work for you without any work.

Feedback

We would love to hear about the experience, positive or negative! To report issues and feature requests: Github issues page. To chat with the team and other users: join the MRE SDK discord community.

Legal

This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit https://cla.microsoft.com.

When you submit a pull request, a CLA-bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., label, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact [email protected] with any additional questions or comments.