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Magic Leap Development

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Setup

Magic Leap Lab

Installations

Packages

Certificates

Management

  • From ML developer account, generate developer certificate for testing to ML device.
  • Certificate and accompanying key need to be stored together in the same directory.
  • Developer certificates expire 1 year after being issued.

UE4 Workflow

Project Settings

Installations

Currently employing Epic Games Store Version of Magic Leap UE4, which is based on UE4 4.24.2 and uses Lumin SDK 0.24.0.

Installation Dir:

C:\MLDev\MagicLeapUE4Editor

Project Settings

  1. Configure project for Magic Leap via Project Settings > Platforms > Magic Leap > Magic Leap App Tile > Configure Now.
  2. Set path to certificate in Project Settings > Platforms > Magic Leap > Distribution Signing > Certificate File Path.
  3. Specify SDK path in Project Settings > Platforms > Magic Leap SDK > SDKConfig.
  4. Restart UE4 editor.

Build Settings

Package & App Name

Project Settings > Platforms > Magic Leap > MPK Packaging >

  • Magic Leap Package Name

    • Naming convention

    com.Company.ProjectName

    Example

    com.Hans.Sandbox
  • Application Display Name

    • This is the name to be displayed if ProjectName not specified in Package Name parameter.

Icons (App Tiles)

Requires Model & Portal folder.

Project Settings > Platforms > Magic Leap > Magic Leap App Tile

Reference: https://developer.magicleap.com/en-us/learn/guides/portal-icon-guidelines

Privileges

  • Types
    • Auto-granted
    • Sensitive
      • Requires user consent.
    • Reality
      • Requires user consent.
  • User consent requested on first request and not prompted for each session.
  • Privileges located in Project Settings > Platforms > Magic Leap > Advanced MPK Packaging > App Privileges

Reference: https://developer.magicleap.com/en-us/learn/guides/privileges

Simulator & Device Testing

Preview Testing in ML Device

  1. Start Zero Iteration from Lab and set to Device mode.
  2. Launch UE4 and open UE4 project.
  3. Play > VR Preview to view/interact with game in ML device.

Preview Testing in Simulator

To re-enable mouse controls when UE4 preview runs, press SHIFT + F1.

Eye View Window Controls

Keyboard Shortcuts

NameShortcutNotes
View Navigation
LMB
Scene Navigation (Forward, Backward, Right, Left, Up, Down)
W, A, S, D, Q, E

Development

Control

Frame Definition (UE4)

  • Origin: Center of touchpad
image

Video capture of axis superimposed on control through Magic Leap device.

Reference: https://developer.magicleap.com/en-us/learn/guides/control-6dof-unreal-engine

Resources

Starter Magic Leap Dev Guide for UE4

Samples, Tutorials & Snippets

https://developer.magicleap.com/en-us/learn/guides/unreal-tutorials-samples

UE4 Examples

Overview

Some of the documented examples provided by Magic Leap and UE4 include the following. My testing and documentation notes are outlined in the next sections.

  • Controller
  • Hand Tracking
  • Image Tracking
    • Detect & track image targets.
  • Meshing
    • Scan world environment for collision data, occlusion.
  • Planes
  • Raycast

Reference: https://developer.magicleap.com/en-us/learn/guides/sdk-examples-landing-page

UE4 Example Files

Project Directory

C:\Users\<username>\MagicLeap\tools\unreal\v0.24.1\examples\Unreal

Documentation

C:\Users\<username>\MagicLeap\tools\unreal\v0.24.1\examples\Unreal\Content\Examples\Documentation

Testing & Documentation

Image Tracking

Image Tracking BP & Event Graph

Details (MagicLeapImageTracker component)

  • Image Tracking > MagicLeap >
  • Components
    • MagicLeapImageTracker
      • Enabled Events
        • On Image Target Found
        • On Image Target Lost
        • These drive event/s such as hiding/unhiding target asset/s.
        • Position of target asset/s are at the origin of BP.
      • This component serves as the parent to any assets intended to be linked as children to image tracker/target.
  • GetWorldLocation
    • This is an alternative way of positioning an asset relative to the MagicLeapImageTracker.
image

Reference: https://developer.magicleap.com/en-us/learn/guides/image-tracking-unreal-engine

Assets

The asset used in this test is a burrito model that I generated in Houdini and have been using as a test subject in my computer graphics exploration. It was imported into the UE4 project as a .glTF file and through UE4's glTF Importer plugin.

Testing on Magic Leap

image

Image tracking test on Magic Leap device. Recording via The Lab and Magic Leap device utilized camera, so the image tracking was not functioning when recording. However, this video captured the digital version of the experience, but not the mixed reality environment. Although the physical image tracker is not visible in this capture, it was used to test the tracking stability. The test used a good image for tracking, but still showed some instability..

Initialize Scene

Specify the actor intended to be the focal point of the initial interaction within the ML experience with Event BeginPlay > Set Focus Actor in the Level BP.

Raycast

Capture Documentation

Reference: https://www.magicleap.care/hc/en-us/articles/360020300672-Capturing-Screenshots-and-Video

Zero Iteration

Use The Lab > Zero Iteration to enable deployment from tools such as Unity and UE to a connected Magic Leap device or the simulator. This needs to be enabled before recording video to capture the mixed reality experience.

Recordings via Magic Leap device

These captures are recorded through the Magic Leap device by pressing the Home button on the controller and then tapping the Bumper button to start/stop recording.

Recording can also be enabled via the Magic Leap mobile app.

Using The Lab > Device Bridge, the recordings are listed in the Files section and can be downloaded to the the computer. These files are saved to the following directory:

C:\Users\<username>\MagicLeap\downloads

Recordings via Device Stream

When enabled in The Lab, content streamed from use of Magic Leap device can be recorded to snapshots and video. These files are saved to the following directory:

C:\Users\<username>\MagicLeap\captures

Resources

Control

https://developer.magicleap.com/en-us/learn/guides/control-6dof

Magic Leap Controller GLB file

Source: https://aframe.io/docs/1.2.0/components/magicleap-controls.html#example

Notes

Lighting

Use cubemap with PPV rather than directional light

If it results in an issue with viewing the scene when packaged, then disable this cubemap and instead using a Skylight and set to Movable and set the Cubemap here.

Set interactive actors to Movable, not Static.

Packaging

Disable Project Settings > Project > Packaging > Exclude editor content when cooking to expedite and optimize .MPK file.

Navigate to the Builds directory.

Install_UsingML.bat

Run this file.

Uninstall_UsingML.bat

ApplicationFile.mpk

Launch > Project Launcher > Advanced

Select Magic Leap One Creator Edition > Data Build > By The Book

Then Launch.

When log shows Launching on Lumin, then it should be running on device.