AR TennisFrom HIT Lab NZ
The possibility of using camera based tracking on mobile phones offers new opportunities in face-to-face collaborative Augmented Reality. We are researching which interaction metaphors are suitable and what kind of feedback is necessary for awareness, performance and enjoyment in collaborative mobile phone AR games. On their screens the two players see a virtual tennis court superimposed on a marker. The mobile phones act as virtual rackets and are used to hit the ball back and forth between the players. We have created a custom port of ARToolKit to Symbian in order to be able to track the two phones relative to a common marker. In this marker space we run a ball simulation that is synchronized via Bluetooth. The tracking allows us to check if the virtual ball volume intersects with the racket volume defined as a cylinder around the camera view axis. We demonstrate the first collaborative AR application on mobile phones. We also provide design guidelines for development of similar games. The user study gave us valuable insight as to what collaborative AR gaming on mobile phones requires to be enjoyable. Augmented Reality technology allows mobile phones to offer advanced 6 DOF setting of view parameters and advanced manipulation techniques. It allows the motion of the device itself to be used as input. Using AR on mobile phones will open up a range of new games like AR Tennis. This game will be followed by others featuring more advanced interaction techniques. We are working on more advanced object manipulation and scene assembly techniques where the one or several users can select, translate and rotate 3D objects using both isomorphic and isometric interaction on a mobile phone.
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