Hello everyone.

The Mixed Reality Forums here are no longer being used or maintained.

There are a few other places we would like to direct you to for support, both from Microsoft and from the community.

The first way we want to connect with you is our mixed reality developer program, which you can sign up for at https://aka.ms/IWantMR.

For technical questions, please use Stack Overflow, and tag your questions using either hololens or windows-mixed-reality.

If you want to join in discussions, please do so in the HoloDevelopers Slack, which you can join by going to https://aka.ms/holodevelopers, or in our Microsoft Tech Communities forums at https://techcommunity.microsoft.com/t5/mixed-reality/ct-p/MicrosoftMixedReality.

And always feel free to hit us up on Twitter @MxdRealityDev.

Loading and saving difficulties currently with Unity5.50b7 and Hololens

I want to save and load persistently using the Hololens. I am confused by the fact that

1) The maximum version of C# that is compatible with the Unity platform is C# 4.4

2) Universal Windows Platform allows the frequent use of new asynchronous symbols in its arsenal such as async, await, task. These are not available until you use C#5 and C#6. However I have seen references to other users using C#5 commands with the hololens such as


You look at the project in Unity 5.50b7 and you get error messages. How can this be?

3) The binaryformatter does not seem to be available in UWP as the namespace is missing. You can use the sharpSerializer free add in and you can download the dll


and plonk it into your Asset directory. Unity will then nicely include it as a reference in your next build from Unity and you can then see it in VS15 in your object browser.

4) Windows.Storage namespace is not available if you want to use Unity again. There is no problem until you have to go back to Unity, then you find it is gives file errors on its version of C# 4.4.

I find it extraordinary that I have to go to such lengths to get support for loading and saving files from my HoloLens App. Surely I have made an error here. Can anyone advise me on what I have done incorrectly?

Best Answers


  • SpheredCazualSpheredCazual ✭✭
    edited October 2016

    First things first the latest version of unity with Hololens support is 5.4.0f3-HTP (https://unity3d.com/partners/microsoft/hololens#download). Secondly can you give some sample code you have written so we can assist you.

    Secondly: try looking at this tutorial https://unity3d.com/learn/tutorials/topics/scripting/persistence-saving-and-loading-data

    creative mind, free thinker, dreamer, maker, mostly working on games and doodling around with gadgets, Sphered Cazual/Elite/Master of the Universe/Dad/Husband @mariovermeulen

  • Dear SpheredCazual,

    Are all Hololens compatible updates to Unity shown in the Version number as having an -HTP suffix? I notice in previous queries in August that JimboHalo10 comments

    _> Jimbohalo10 ✭✭✭ August 5 edited August 5

    @TRR said:
    I'm getting this same error after installing the latest Unity version (5.4.0f3), which was released last week. Is this an issue again? Are the tutorials no longer compatible again?

    Unfortunately there is major difference between standard unity and HTP HoloLens Unity.
    Please uninstall and reinstall the HoloLens kit in sequence as described in Install the HoloLens Toolset for HTP version 5.4.0f1 HTP. Version 5.4F3 is the NON HoloLens version

    Install Visual Studio 2015 Update 3, then the HoloLens Emulator, then The Unity HoloLens Technical Preview is based off of the Unity 5.4b24 HTP builds.

    Install the HoloLens Toolset for HTP version 5.4.0f1 HTP_

    This is in Q & A


    So the developer @TRR was using the non-holoLens version of the installation you were suggesting to me as it was (5.4.0f3) instead of the version holoLens compatible version 5.4.0f3-HTP ?

  • SpheredCazualSpheredCazual ✭✭
    edited October 2016

    It does seem odd as on the microsoft forum here it still says use the older beta versaion but on Unity forum it says it is also included in the latest beta versions https://forum.unity3d.com/threads/new-build-hololens-now-included-in-the-5-5-betas.418134/

    So it would be a choice to go witht the one noted here or with the latest BETA from Unity, not sure what is wise ;-)

    FYI I ave stayed with using the HTP version

    creative mind, free thinker, dreamer, maker, mostly working on games and doodling around with gadgets, Sphered Cazual/Elite/Master of the Universe/Dad/Husband @mariovermeulen

  • Hi from the Unity 5.5B7 Release Notes is these known problems
    Windows Store: Building to a folder outside of the project folder fails. (826034)
    Windows Store: Editor crashes when canceling build when build progress shows "Restoring NuGet packages". (826083)

    HoloLens: The builtin spatial mapping occlusion shader has been optimized, thus provides higher frame rates.
    Except that the Shader compiler has internal errors , when trying to build with WSA Player Universal 10,D3D, C# output. _

    Crashes after Restoring NuGet Packages, especially .Net Core 5.0, know as the UWP libraries.

    This has intermittent problems, the Windows 10 needs a restart, probably needs creating of several folders, before building, then has debug errors whilst in Visual Studio 2015 update 3.

    Works first time in 5.4F3 HTP (HoloLens Technical Preview)

    Unity Support are not interested in fixing WSA Player errors at the moment. My project is large and takes over 60 seconds to load into VS2015, over 200 files from a large Unity Asset store app.

Sign In or Register to comment.