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We present an approach to solving the problem of haptic and visual misalignment in CAVEs. The approach moves the collision box for the virtual screen's buttons to coincide with where the user perceives their virtual location. Different filtering strategies were used. We evaluated the algorithms with simulations and with real subjects.

International audience; is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. This is an author-deposited version published in: https://sam.ensam.eu Handle ID Abstract-This article presents a comparison of different haptic systems, which are designed to simulate flat Human Machine Interfaces (HMIs) like touchscreens in virtual environments (VEs) such as CAVEs, and their respective performance. We compare a tangible passive transparent slate to a classic tablet and a sensory substitution system. These systems were tested during a controlled experiment. The performance and impressions from 20 subjects were collected to understand more about the modalities in the given context. The results show that the preferences of the subjects are strongly related to the use-cases and needs. In terms of performance, passive haptics proved to be significantly useful, acting as a space reference and a real-time continuous calibration system, allowing subjects to have lower execution durations and relative errors. Sensory substitution induced perception drifts during the experiment, causing significant performance disparities, demonstrating the low robustness of perception when spatial cues are insufficiently available. Our findings offer a better understanding on the nature of perception drifts and the need of strong multisensory spatial markers for such use-cases in CAVEs. The importance of a relevant haptic modality specifically designed to match a precise use-case is also emphasized.; This article presents a comparison of different haptic systems, which are designed to simulate flat Human Machine Interfaces (HMIs) like touchscreens in virtual environments (VEs) such as CAVEs, and their respective performance. We compare a tangible passive transparent slate to a classic tablet and a sensory substitution system. These systems were tested during a controlled experiment. The performance and impressions from 20 subjects were collected to understand more about the modalities in the given context. The results show that the preferences of the subjects are strongly related to the use-cases and needs. In terms of performance, passive haptics proved to be significantly useful, acting as a space reference and a real-time continuous calibration system, allowing subjects to have lower execution durations and relative errors. Sensory substitution induced perception drifts during the experiment, causing significant performance disparities, demonstrating the low robustness of perception when spatial cues are insufficiently available. Our findings offer a better understanding on the nature of perception drifts and the need of strong multisensory spatial markers for such use-cases in CAVEs. The importance of a relevant haptic modality specifically designed to match a precise use-case is also emphasized.

International audience; In co-located collaborative environment for product design, new groupware of multi-view system allows multiple experts to have individual visual information. A co-located multi-view VR system and a multidisciplinary task have been created and studied. Results show that using multi-view VR system achieves a better effectiveness and user performance. Then, an application for collaborative ergonomic design is explored and an industrial multidisciplinary scenario is realized with proposed system.

International audience; The contribution of tangible and intangible feedback is compared for virtual tactile car Human-Machine Interfaces (HMI) design, to measure their performance both in static conditions and while driving. A subjectively calibrated transparent glass provides tangible passive haptics, and visual cues are used to study sensory substitution-based intangible interactions. The results show that the performance of the subjects was significantly improved in driving conditions as they interacted faster, more accurately and with a higher satisfaction. In addition, our findings highlight that the contribution of tangible systems is significantly lower in driving conditions, raising new questions about the nature of haptic modalities in the function of the context of use. This study provides additional knowledge about the influence of dynamic environments and external tasks on haptic perception.

International audience; Renault is currently setting up a new CAVE™, a 5 rear-projected wall virtual reality room with a combined 3D resolution of 100 Mpixels, distributed over sixteen 4k projectors and two 2k projector as well as an additional 3D HD collaborative powerwall. Renault's CAVE™ aims at answering needs of the various vehicle conception steps [1]. Starting from vehicle Design, through the subsequent Engineering steps, Ergonomic evaluation and perceived quality control, Renault has built up a list of use-cases and carried out an early software evaluation in the four sided CAVE™ of Institute Image, called MOVE. One goal of the project is to study interactions in a CAVE™, especially with nomad devices such as IPhone or IPad to manipulate virtual objects and to develop visualization possibilities. Inspired by nomad devices current uses (multi-touch gestures, IPhone UI look'n'feel and AR applications), we have implemented an early feature set taking advantage of these popular input devices. In this paper, we present its performance through measurement data collected in our test platform, a 4-sided homemade low-cost virtual reality room, powered by ultra-short-range and standard HD home projectors.

In this experiment, carried out at Renault, we studied size perception in virtual environments. We compared 1:1 scale perception of a cockpit through two different virtual reality systems: a Head Mounted Display (HMD), which can be used as virtual or augmented reality system, and a cylindrical screen vs. the physical 1:1 scale. We show that differences exist between size perception using the HMD, and using the cylindrical screen.

This thesis tackles the subject of the feedbacks of interactions in virtual environments. The theoretical part addresses the different perception schemes and the corresponding haptic modalities. We especially focused on the relevance of each modality for each use-case, on the compatibility with the visual systems which take an important place in virtual reality, and on the problematics of each situation. These studies led us to evaluate passive haptics and sensory substitution for interactions in CAVEs. The results show the importance of choosing the right modality relative to the scenario design. We also evaluated how mismatched the visual and haptic workfield can be, and how the performance of interactions suffers from this fact. Ultimately, we tested a few software-based methods meant to improve the performance of the interactions of the subjects., Ce projet de thèse de doctorat traite du retour sensoriel du toucher dans des environnements virtuels. La partie théorique s’intéresse aux différents schémas de perception du toucher et aux modalités haptiques correspondantes. Nous nous sommes particulièrement concentrés sur la pertinence de chaque modalité pour chaque usage, à leur compatibilité avec les systèmes visuels qui ont une place très importante en réalité virtuelle, ainsi qu’aux problématiques inhérentes à chaque cas. Ces réflexions nous ont amenés à évaluer les méthodes d’haptique passive et de substitution sensorielle dans le cadre d’interactions dans des CAVEs. Les résultats mettent en lumière l’importance du choix de la modalité en parallèle avec la construction du scénario, mais aussi les difficultés à colocaliser les moteurs haptiques et visuels. Les interactions peuvent souffrir de performances insuffisantes si des précautions ne sont pas prises. Enfin, nous avons testé quelques méthodes logicielles visant à améliorer les performances des sujets lorsqu’ils interagissent.