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Auflistung nach Autor:in "Willms, Jan"

1 - 3 von 3
  • Konferenzbeitrag
    The Effect of Camera Perspectives on Locomotion Accuracy in Virtual Reality
    (Mensch und Computer 2019 - Tagungsband, 2019) Ujkani, Arbresh; Willms, Jan; Turgut, Lezgin; Wolf, Katrin
    This paper investigates the effect of commonly used camera perspectives (First-person perspective, over the shoulder, behind the back and from top to bottom) on locomotion efficiency in virtual reality (VR). To test this research objective in a user study, a virtual test environment was implemented in which a ball can be maneuvered using four different camera perspectives. We analyzed the time taken to complete four different paths and the offset between the path taken and the optimal one (path accuracy) displayed on the ground. The study results show that the "first person perspective" and "behind the back" perspectives allow more precise maneuvering in VR, while no difference in speed was found. We defined guidelines that can help game designers and VR developers to create VR applications with high accuracy needs. Our findings are relevant, especially to decide which perspectives are best for specific applications that require high accuracy, such as remote surgery.
  • Konferenzbeitrag
    HapticCollider: Ungrounded Force Feedback for Rigid Collisions during Virtual Tool Use
    (Mensch und Computer 2023 - Tagungsband, 2023) Olaya-Figueroa, Juan F.; Streicher, Ferdinand; Kurzweg, Marco; Willms, Jan; Wolf, Katrin
    Controllers are not merely the dominant interface to interact in virtual reality (VR); they also are the main resource for haptically perceiving the virtual world. As standard VR controllers fail in generating realistic haptic feedback, we designed HapticCollider, a kinetic controller rendering force feedback, e.g., to simulate a collision when hammering against a virtual object. In our user study, we demonstrated that HapticCollider significantly increases realism in tool usage compared with a standard VR controller. As key factors for tool use realism in VR, we identified force feedback, controller weight, and grip shape in combination with software solutions, namely collision prediction, and control-display ratio to render the force timing, as well as, the tool position according to the user's expectations.
  • Konferenzbeitrag
    Pull Outperforms Push as Vibrotactile Wristband Feedback for Mid-Air Gesture Guidance
    (Mensch und Computer 2023 - Tagungsband, 2023) Willms, Jan; Letter, Maximilian; Marchandise, Emile; Wolf, Katrin
    The use of mid-air gestures to control interactive systems is becom- ing increasingly important, particularly in mixed reality scenarios. However, these gestures are not always intuitive and can be chal- lenging to learn as they lack visual guidance. Therefore, it is crucial to explore strategies to improve the learnability of these gestures. In this work, it is investigated how a vibration stimulus can be applied at the forearm to guide a person in performing a gesture. Utilizing a prototypical wristband with 24 vibrotactile actuators, the metaphors pull and push, representing attractive and repulsive feedback, were compared against each other. Results of a controlled user study show that participants perform significantly better with the pull metaphor, completing gestures faster, and make fewer er- rors. In line with this, the majority stated a subjective preference towards pull after experiencing both metaphors.