I'm confused about what the Mixed Reality Toolkit is and how to use it. I'm creating a UWP Hololens app using C# and UrhoSharp. Can I use the MRTK or can it only be used with Unity?
There are two toolkits one is unity specific. The other isn't, but is C++.
When @Egorbo implemented urhosharp, he initially put in plane finding from the mrtk. You can look through the code to see how he did it. He didn't link to .dll's for this, but added c++ files.
Here is a link to that code:
The easiest way I've found to take advantage of the mrtk is to learn to compile urho and UrhoSharp, then extend it by adding in the mrtk components that you want to use as @Egorbo did, but you need some c++ skills.
Another way is to wrap the c++ dlls in c# wrappers to access the functionality.
I've not found the mrtk components in c#. Also not really finding much useful in that toolkit, but likely since I've been on a different path.