Simo

Simo is the first approach that transforms an single off-the-shelf smartphone into a user motion tracking device and controller. Both the front and back cameras of the smartphone are used simultaneously to track the user’s hand, head, eye-gaze and body movements in real-world space and scale.

Simo is an ARKit iOS application made in Unity.

Features

Device/hand motion + touch inputs: Users can interact by performing 3D hand movements in 6DOF (translation + rotation) and can reliably segment and further enhance their gestures by touchscreen inputs.
Head pose tracking: 6DOF head tracking. Example: This can be used for head-pointing.
Eye-gaze tracking: 6DOF eye-gaze tracking. Example: This can be used for eye-pointing.
Body pose tracking: 6DOF tracking of the torso (position + orientation). Example: This can be used for body-position or ego-centric interactions.
No specialized hardware required: No external hardware, external trackers, markers or cameras are required. Everything relies only on a single iPhone.

The Simo app tracks all following user motions simultaneously, in real-time and in world-scale:

Tracking areas of the front and back iPhone camera.

Device/Hand tracking.

Head pose tracking.

Eye-Gaze tracking.

Body tracking.

Quickstart guide

Open the Simo project in Unity.
Select iOS as the target platform under File > Build Settings > Platform > iOS > click Switch Platform.
Build the iOS app under File > Build Settings > Build > Create folder > Choose a name > click Save.
In the created folder select Unity-iPhone.xcodeproj and open it in Xcode.
Connect your iPhone to your Mac and select it as the build Device.
In Xcode project settings under Signing & Capabilities select your Apple Developer Signing Team ID, Bundle Identifier, and press Play.
Open the Simo app on your iPhone.
Place an AR Anchor on the floor of your room and use the Change camera and Change view buttons to toggle between different tracking views.

Compatibility

The project was last tested and run in Unity 2021.3+, Xcode 14.3, iPhone 13 Pro and iOS 16.4

System requirements:

iPhone with ARKit and FaceID capabilities
Unity
Xcode
MacOS

More information

This work is based on a publication “Simo: Interactions with Distant Displays by Smartphones with Simultaneous Face and World Tracking” in the CHI EA ‘20: Extended Abstracts of the 2020 CHI Conference on Human Factors in Computing Systems. The publication also includes related work, user studies, applications, and future work directions.