AR Game

Unity, ARToolkit, Android Deployment

1. Download newest Unity, JDK, Android SDK, ARToolkit5 Tools, ARToolkit5 for Unity
   • https://unity3d.com/de/get-unity/download
   • https://artoolkit.org/download-artoolkit-sdk
   • Create Unity Account if needed
2. Open Project (/ ARToolkit sample scene "Standard Asset Example Project" / "CubemarkerScene")
3. Open Unity, import ARToolkit Tools, ARToolkit Package
   • Assets->Import Package, only select those 3 Folders!
4. Switch Project Type to Android (File->Build Settings)
5. Unity Edit->Preferences->External Tools set JDK Path and Android SDK Path
6. Print example marker
7. Build Settings -> Build (Export to game.apk)
8. Install using Unity, Android Debug Bridge('adb install -r game.apk') or copy manually
9. Change AR params if needed (Unity SceneGraph->ARToolKit->Inspektor, Threshold und Cutoff)

Troubleshooting

• "unable to list target platforms": Apply Android SDK patch tools_r25.2.3-windows.zip. [Help]
• "Plugins colliding error": delete libARWrapper.so and libc++_shared.so in PROJECT_DIR\Assets\Plugins\Android

Notes

• According to docs, an older Unity version is compatible with ARToolkit. This is not true, new Versions are also supported
• Known issue: Autofocus / camera resolution fix. Solution available but worse tracking?
  • dest: PROJECT_DIR\Assets\Plugins\Android\UnityARPlayer.jar
    • default Unity project path: C:\Users\Public\Documents\Unity\Projects
  • Replace this file (or move to entirely else Folder) with this
  • (Source) To solve these issues, we may want to follow the issue trackers/forum

Tips & Tricks

• Change Object Material: Mesh Renderer -> Material -> Element 0 -> Click small far right circle
• Asset Store allows searching for free Assets (Textures, Shaders)
• Invisible boxes by disabling Mesh Renderer
• Object Layer should be "AR Background 2"
• Physically interacting Objects need "RigidBody" component
• "Marker Scene" contains "AR Tracked Object" component, set "stay visible" in seconds (f.i. 0.05)
• Tilt-Device-Physics requires Accelerometer C# Code Snippet
  • Script File and Class name must match

Game Object Setup

Flipper

• Hinge Joint
  • Spring: 5000
  • Damper: 15
  • Limit Min: 0 (left), -45 (right)
  • Limit Max: 45 (left), 0 (right)
• Flipper Controller
  • Input Button: left or right button from canvas (Canvas has to be part of the scene!)
  • Rest Position: 0 (L & R)
  • -45 (left), 45 (right)
  • Input Name: name of the input source witch is setted in the project preferences

References

• Scripts in ARToolKit for Unity
• Marker Patterns
• Unity Collisions
• ARToolkit for Unity info
• ARToolkit issues Forum
• ARToolkit issues GitHub