{"id":316,"date":"2021-01-05T02:52:34","date_gmt":"2021-01-05T02:52:34","guid":{"rendered":"https:\/\/lucyestela.com\/dev\/?p=316"},"modified":"2021-03-25T03:01:51","modified_gmt":"2021-03-25T03:01:51","slug":"uehl2_mixedreality","status":"publish","type":"post","link":"https:\/\/lucyestela.com\/dev\/unreal\/uehl2_mixedreality\/","title":{"rendered":"Unreal and Hololens 2 – Step 5 Set Up for Mixed Reality"},"content":{"rendered":"
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Again I am following the Microsoft tutorial, just adding in extra screen grabs to help solidify the process in my mind. For the original tutorial, look here https:\/\/docs.microsoft.com\/en-us\/windows\/mixed-reality\/develop\/unreal\/tutorials\/unreal-uxt-ch3<\/a><\/p>\n

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Add The Session Asset<\/h4>\n

To use a session, you need an ARSessionConfig data asset to work with. To create one of these go to your Content Browser window. Make sure you are in the root Content folder by clicking on the Content folder.<\/strong><\/p>\n

Click Add\/Import > Miscellaneous > Data Asset<\/strong> <\/p>\n

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Select ARSessionConfig<\/strong>, click Select<\/strong><\/p>\n

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name the asset ARSessionConfig<\/strong>.<\/p>\n

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Double-click ARSessionConfig<\/strong> to open it, leave all default settings and hit Save<\/strong>. Return to the Main window.<\/p>\n

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Start and Stop AR Session<\/h4>\n

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To start the AR session you use a Level Blueprint. <\/strong>Connecting the ARSessionConfig asset in the Level Blueprint guarantees the AR session will fire right when the game starts playing.<\/p>\n

To do this click Blueprints > Open Level Blueprint<\/strong> from the editor toolbar:<\/p>\n

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This will open up the Eventgraph window. Now this is node based work, so if you’ve ever used Shadergraph or Houdini then you’ll be familiar with this kind of coding. If not then just hang in there, this is a really easy entry example to set up. Don’t worry, you’ll get used to it.<\/p>\n

Drag the execution node (left-facing arrow icon) off Event BeginPlay<\/strong> and release<\/p>\n

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then search for the Start AR Session<\/strong> node<\/p>\n

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and hit enter. Excellent, you just connected two nodes.<\/p>\n

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Click the Select Asset<\/strong> dropdown under Session Config<\/strong> and choose the ARSessionConfig<\/strong> asset.<\/p>\n

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Right-click anywhere in the EventGraph and create a new Event EndPlay<\/strong> node. <\/p>\n

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Just like we did for the BeginPlay Event, we’re going to drag the execution pin and release, then search for a Stop AR Session<\/strong> node and hit enter.<\/p>\n

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Hit Compile<\/strong>, then Save<\/strong> and return to the Main window.<\/p>\n

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create a pawn<\/h4>\n

At this point, the project still needs a player object. In Unreal, a Pawn<\/strong> represents the user in the game, but in this case it’s going to be the HoloLens 2 experience.<\/p>\n

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Click Add New > Blueprint Class<\/strong> in the Content<\/strong> folder<\/p>\n

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Expand the All Classes<\/strong> section at the bottom. Search for DefaultPawn<\/strong>, click Select<\/strong><\/p>\n

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Name it MRPawn<\/strong>, and double-click the asset to open.<\/p>\n

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Click Add Component > Camera<\/strong> from the Components<\/strong> panel and name it Camera<\/strong>.<\/p>\n

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Make sure that the Camera<\/strong> component is a direct child of the root (CollisionComponent<\/strong>). This allows the player camera to move with the HoloLens 2 device.<\/p>\n

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Select CollisionComponent<\/strong> from the Components<\/strong> panel and scroll down to the Collision<\/strong> section of the Details<\/strong> panel.<\/p>\n