Browsing by Author "Tanikawa, Tomohiro"

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    Error Correction in Redirection: Rotational Manipulation for Natural Walking and Control of Walking Paths
    (The Eurographics Association, 2018) Mizutani, Junya; Matsumoto, Keigo; Nagao, Ryohei; Narumi, Takuji; Tanikawa, Tomohiro; Hirose, Michitaka; Bruder, Gerd and Yoshimoto, Shunsuke and Cobb, Sue
    This study proposes a novel rotational manipulation method for redirection when users attempt to turn around a corner within a virtual environment. The basic manipulation of conventional redirection can be classified into translational, rotational, and curvature manipulations. In conventional rotational manipulation, users must stop and rotate. However, this behavior is not natural in everyday walking. In addition, because the manipulated rotation varies depending on the amount of the user's rotation, this manipulated rotation could differ from the assumed rotation if the user does not rotate by the assumed angle during this manipulation. Correspondingly, the actual walking path may deviate from the planned path. Misalignment of the walking path may cause a deviation in the interaction with an object in real space, thus resulting in collision with real-space objects and other users. We devised a basic manipulation of redirection and formulated a novel method for manipulating the amount of rotation when users rotate while moving. Using this method, we changed the axis of rotational manipulation for preventing mismatches between real and virtual environments, and set an area to correct the error in rotational manipulation. The results of our experiments demonstrated that it is possible to control the walking paths and manipulate the amount of rotation during movement without changing the amount of rotation perceived by users, and without increasing discomfort. The results demonstrated that our method is useful for manipulating the viewpoint when a user walks naturally.
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    Visuo-Haptic Redirected Walking Using Handrail
    (The Eurographics Association, 2018) Matsumoto, Keigo; Narumi, Takuji; Yanase, Yohei; Ban, Yuki; Tanikawa, Tomohiro; Hirose, Michitaka; Huang, Tony and Otsuki, Mai and Servières, Myriam and Dey, Arindam and Sugiura, Yuta and Banakou, Domna and Michael-Grigoriou, Despina
    A novel use of virtual reality (VR) was demonstrated. It enables a user to feel walking a straight virtual corridor while touching straight handrails, although the user walks while gripping circular handrails within a limited space. The main contribution of this study is to show that visual-haptic redirect walking is possible using handrails for a haptic presentation. Matsumoto et al. introduced visuo-haptic redirected walking. They used walls as a haptic presentation, and they produced Unlimited Corridor as a VR demonstration using visuo-haptic redirected walking. However, it has not yet been verified whether the same effect can occur by touching other shapes. Therefore, in this study, a VR demonstration using handrails instead of walls was created, and whether visuo-haptic redirected walking is possible even with handrails for haptic presentation was examined. In the demonstration, more than 2000 people participated, and their comments and motion data were gathered. The users' comments implied that visuo-haptic redirected walking was possible using handrails.