Browsing by Author "Argelaguet, Ferran"

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    Can You Find Your Way? Comparing Wayfinding Behaviour Between Reality and Virtual Reality
    (The Eurographics Association, 2023) Goupil, Vincent; Arnaldi, Bruno; Argelaguet, Ferran; Michaud, Anne-Solène; Gouranton, Valérie; Jean-Marie Normand; Maki Sugimoto; Veronica Sundstedt
    Signage is an essential element in finding one's way and avoiding getting lost in open and indoor environments. Yet, designing an effective signage system for a complex structure remains a challenge, as some buildings may need to communicate a lot of information in a minimum amount of space. Virtual reality (VR) provides a new way of studying human wayfinding behaviour, offering a flexible and cost-effective platform for assessing the efficiency of signage, especially during the design phase of a building. However, it is not yet clear whether wayfinding behaviour and signage interpretation differ between reality and virtual reality. We conducted a wayfinding experiment using signage with 20 participants who performed a series of tasks in virtual and real conditions. Participants were video-recorded in both conditions. In addition, oral feedback and post-experiment questionnaires were collected as supplementary data. The aim of this study was to investigate the wayfinding behaviour of a user using signs in an unfamiliar real and virtual environment. The results of the experiment showed a similarity in behaviour between both environments; regardless of the order of passage and the environment, participants required less time to complete the task during the second run by reducing their mistakes and learning from their first run.
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    Does the Control Law Matter? Characterization and Evaluation of Control Laws for Virtual Steering Navigation
    (The Eurographics Association, 2020) Brument, Hugo; Olivier, Anne-Hélène; Marchal, Maud; Argelaguet, Ferran; Argelaguet, Ferran and McMahan, Ryan and Sugimoto, Maki
    This paper aims to investigate the influence of the control law in virtual steering techniques, and in particular the speed update, on users' behaviour while navigating in virtual environments. To this end, we first propose to characterize existing control laws. Then, we designed a user study to evaluate the impact of the control law on users' behaviour and performance in a navigation task. Participants had to perform a virtual slalom while wearing a head-mounted display. They were following three different sinusoidal-like trajectory (with low, medium and high curvature) using a torso-steering navigation technique with three different control laws (constant, linear and adaptive). The adaptive control law, based on the biomechanics of human walking, takes into account the relation between speed and curvature. We propose a spatial and temporal analysis of the trajectories performed both in the virtual and the real environment. The results show that users' trajectories and behaviors were significantly affected by the shape of the trajectory but also by the control law. In particular, users' angular velocity was higher with constant and linear laws compared to the adaptive law. The analysis of subjective feedback suggests that these differences might result in a lower perceived physical demand and effort for the adaptive control law. The paper concludes discussing the potential applications of such results to improve the design and evaluation of navigation control laws.
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    Electrotactile Feedback For Enhancing Contact Information in Virtual Reality -- Best Paper Award
    (The Eurographics Association, 2021) Vizcay, Sebastian; Kourtesis, Panagiotis; Argelaguet, Ferran; Pacchierotti, Claudio; Marchal, Maud; Orlosky, Jason and Reiners, Dirk and Weyers, Benjamin
    This paper presents a wearable electrotactile feedback system to enhance contact information for mid-air interactions with virtual objects. In particular, we propose the use of electrotactile feedback to render the interpenetration distance between the user's finger and the virtual content is touched. Our approach consists of modulating the perceived intensity (frequency and pulse width modulation) of the electrotactile stimuli according to the registered interpenetration distance. In a user study (N=21), we assessed the performance of four different interpenetration feedback approaches: electrotactile-only, visual-only, electrotactile and visual, and no interpenetration feedback. First, the results showed that contact precision and accuracy were significantly improved when using interpenetration feedback. Second, and more interestingly, there were no significant differences between visual and electrotactile feedback when the calibration was optimized and the user was familiarized with electrotactile feedback. Taken together, these results suggest that electrotactile feedback could be an efficient replacement of visual feedback for enhancing contact information in virtual reality avoiding the need of active visual focus and the rendering of additional visual artefacts.
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    ICAT-EGVE 2020 - International Conference on Artificial Reality and Telexistence and Eurographics Symposium on Virtual Environments
    (The Eurographics Association, 2020) Argelaguet, Ferran; McMahan, Ryan; Sugimoto, Maki; Kulik, Alexander; Sra, Misha; Kim, Kangsoo; Seo, Byung-Kuk; Argelaguet, Ferran and McMahan, Ryan and Sugimoto, Maki
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    Influence of Threat Occurrence and Repeatability on the Sense of Embodiment and Threat Response in VR
    (The Eurographics Association, 2020) Fribourg, Rebecca; Blanpied, Evan; Hoyet, Ludovic; Lécuyer, Anatole; Argelaguet, Ferran; Argelaguet, Ferran and McMahan, Ryan and Sugimoto, Maki
    Does virtual threat harm the Virtual Reality (VR) experience? In this paper, we explored the potential impact of threat occurrence and repeatability on users' Sense of Embodiment (SoE) and threat response. The main findings of our experiment are that the introduction of a threat does not alter users' SoE but might change their behaviour while performing a task after the threat occurrence. In addition, threat repetitions did not show any effect on users' subjective SoE, or subjective and objective responses to threat. Taken together, our results suggest that embodiment studies should expect potential change in participants behaviour while doing a task after a threat was introduced, but that threat introduction and repetition do not seem to impact the subjective measure of the SoE (user responses to questionnaires) nor the objective measure of the SoE (behavioural response to threat towards the virtual body).