Illusion of Depth by 3D Head Tracking using ARKit and TrueDepth Camera
This document describes the implementation of an illusion of depth on iPhone devices equipped with TrueDepth cameras. By utilizing the ARKit framework and the TrueDepth camera, the app can accurately track the user's head orientation and position, enabling the creation of realistic 3D effects. The app allows users to select which eye to track, or it can attempt to determine the correct eye automatically.
Tracking Head Orientation and Position
To achieve 3D head tracking, the app utilizes the capabilities of ARKit and the built-in TrueDepth camera. The TrueDepth camera, also known as Face ID, consists of a proximity sensor, a flood illuminator, an infrared camera, and an infrared emitter.
Using the infrared camera and emitter, the app captures the user's head position and orientation in real time. By analyzing the captured data, the app can determine the user's head position and orientation within a calibrated space.
Finding the Eye Position in 3D
Once the head position and orientation have been determined, the app can estimate the eye position in 3D space. By leveraging the TrueDepth camera's infrared technology, the app can accurately detect the position of the user's eyes.
The app provides an option to select which eye to track, allowing users to customize their experience. Alternatively, the app can also try to determine the user's preferred eye automatically.
Rendering the Illusion of Depth
To create the illusion and perception of depth, the app utilizes a technique called off-axis projection. This projection technique involves using a non-symmetric camera frustum, which projects the rendered image at an angle to the screen.
By projecting the rendered image to the screen at an angle, objects that are closer to the camera will appear larger and in front of the viewer, while objects that are farther away will appear smaller and behind the screen. This illusion of depth enhances the overall realism of the 3D effect.
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