This mobile app combines face tracking with off-axis projection in Unity3D to create the illusion of depth directly on your phone screen. Using Google ARCore, the app tracks the user’s face and dynamically moves the virtual camera to match their viewpoint. A virtual spotlight, placed at the position of the user’s nose, enhances realism and interactive lighting response.

The app is available for free on the Google Play Store:
https://play.google.com/store/apps/details?id=com.kocosman.DepthIllusionDemoScenes

The project is also open-source. You can explore the full code here:
https://github.com/kocosman/DepthIllusionWithARCore