While Microsoft and the community have created open source tools such as the Mixed Reality Toolkit (MRTK) that will automatically set up your environment for mixed reality, some developers may wish to build their experiences from the ground up.
You’re now ready to begin developing with OpenXR in Unity!
Check out the OpenXR Mixed Reality samples repo for sample unity projects showcasing how to build Unity applications for HoloLens 2 or Mixed Reality headsets using the Mixed Reality OpenXR plugin.