Caminhar no lugar: Novas abordagens de controlo da velocidade e da direção do deslocamento virtual (original) (raw)
2013, Instituto Superior Técnico. Universidade Técnica de Lisboa
Walking-in-Place (WIP) allows users to control their travel in Virtual Environments by taking steps in place. This thesis addresses the problem of mapping feet movements to virtual speed and direction. We present an innovative WIP approach, called SAS-WIP (Speed-Amplitude-Supported Walking-in-Place), supported in two features of feet vertical motion: amplitude and vertical speed. A study with participants suggested consistency between these two metrics and the simulated virtual speed. Our innovative control direction technique maps feet vertical rotation to angular speed, in order to compute the direction vetor. Based on this concept we developed two approaches. One uses constant angular speed while the other uses variable angular speed. An in-depth user evaluation with twenty participants compared the performance provided by our approach to the state of the art and to Wii Nunchucktm joystick, on common travel tasks. The results show that SAS-WIP provides both more efficiency and faster than the state of the art when walking long distances while being more accurate and precise over short distances. While the joystick presented better results in these metrics than either WIP interface, the participants preferred SAS-WIP, and reported they experienced less fatigue, had more fun and exerting more control when using our approach relatively to the state of the art. The results suggest that the concept supported on feet rotation provides a viable approach to controlling travel direction.
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