Hololens start with 3D model

Today i downloaded the Actiongram app and when starting you dont get to place a 2D window but instead a 3D model. I was searching for some information on that but couldnt find anything, except a documentation of microsoft, that this is indeed possible (https://developer.microsoft.com/en-...the_windows_mixed_reality_home#launching_apps). Has anyone tried this yet and can give me some input?

 

Thanks for the links i guess i have to wait