ICAT-EGVE2020
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Browsing ICAT-EGVE2020 by Author "Argelaguet, Ferran"
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Item 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, MakiThis 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.Item 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, MakiItem 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, MakiDoes 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).