A workstation running Unreal Engine with an iPhone for motion capture. [credit: Epic Games ] Unreal Engine developer Epic Games has released Live Link Face, an iPhone app that uses the front-facing 3D sensors in the phone to do live motion capture for facial animations in 3D projects like video games, animations, or films. The app uses tools from Apple's ARKit framework and the iPhone's TrueDepth sensor array to stream live motion capture from an actor looking at the phone to 3D characters in Unreal Engine running on a nearby workstation.