228 research outputs found

    Using an event-based approach to improve the multimodal rendering of 6DOF virtual contact

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    A Conceptual Framework to Support Natural Interaction for Virtual Assembly Tasks

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    Over the years, various approaches have been investigated to support natural human interaction with CAD models in an immersive virtual environment. The motivation for this avenue of research stems from the desire to provide a method where users can manipulate and assemble digital product models as if they were manipulating actual models. The ultimate goal is to produce an immersive environment where design and manufacturing decisions which involve human interaction can be made using only digital CAD models, thus avoiding the need to create costly preproduction physical prototypes. This paper presents a framework to approach the development of virtual assembly applications. The framework is based on a Two Phase model where the assembly task is divided into a free movement phase and a fine positioning phase. Each phase can be implemented using independent techniques; however, the algorithms needed to interface between the two techniques are critical to the success of the method. The paper presents a summary of three virtual assembly techniques and places them within the framework of the Two Phase model. Finally, the conclusions call for the continued development of a testbed to compare virtual assembly methods

    Simulating molecular docking with haptics

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    Intermolecular binding underlies various metabolic and regulatory processes of the cell, and the therapeutic and pharmacological properties of drugs. Molecular docking systems model and simulate these interactions in silico and allow the study of the binding process. In molecular docking, haptics enables the user to sense the interaction forces and intervene cognitively in the docking process. Haptics-assisted docking systems provide an immersive virtual docking environment where the user can interact with the molecules, feel the interaction forces using their sense of touch, identify visually the binding site, and guide the molecules to their binding pose. Despite a forty-year research eïżœort however, the docking community has been slow to adopt this technology. Proprietary, unreleased software, expensive haptic hardware and limits on processing power are the main reasons for this. Another signiïżœcant factor is the size of the molecules simulated, limited to small molecules. The focus of the research described in this thesis is the development of an interactive haptics-assisted docking application that addresses the above issues, and enables the rigid docking of very large biomolecules and the study of the underlying interactions. Novel methods for computing the interaction forces of binding on the CPU and GPU, in real-time, have been developed. The force calculation methods proposed here overcome several computational limitations of previous approaches, such as precomputed force grids, and could potentially be used to model molecular exibility at haptic refresh rates. Methods for force scaling, multipoint collision response, and haptic navigation are also reported that address newfound issues, particular to the interactive docking of large systems, e.g. force stability at molecular collision. The i ii result is a haptics-assisted docking application, Haptimol RD, that runs on relatively inexpensive consumer level hardware, (i.e. there is no need for specialized/proprietary hardware)

    Vibrotactile Rendering of Splashing Fluids

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    3D Multimodal Interaction with Physically-based Virtual Environments

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    The virtual has become a huge field of exploration for researchers: it could assist the surgeon, help the prototyping of industrial objects, simulate natural phenomena, be a fantastic time machine or entertain users through games or movies. Far beyond the only visual rendering of the virtual environment, the Virtual Reality aims at -literally- immersing the user in the virtual world. VR technologies simulate digital environments with which users can interact and, as a result, perceive through different modalities the effects of their actions in real time. The challenges are huge: the user's motions need to be perceived and to have an immediate impact on the virtual world by modifying the objects in real-time. In addition, the targeted immersion of the user is not only visual: auditory or haptic feedback needs to be taken into account, merging all the sensory modalities of the user into a multimodal answer. The global objective of my research activities is to improve 3D interaction with complex virtual environments by proposing novel approaches for physically-based and multimodal interaction. I have laid the foundations of my work on designing the interactions with complex virtual worlds, referring to a higher demand in the characteristics of the virtual environments. My research could be described within three main research axes inherent to the 3D interaction loop: (1) the physically-based modeling of the virtual world to take into account the complexity of the virtual object behavior, their topology modifications as well as their interactions, (2) the multimodal feedback for combining the sensory modalities into a global answer from the virtual world to the user and (3) the design of body-based 3D interaction techniques and devices for establishing the interfaces between the user and the virtual world. All these contributions could be gathered in a general framework within the 3D interaction loop. By improving all the components of this framework, I aim at proposing approaches that could be used in future virtual reality applications but also more generally in other areas such as medical simulation, gesture training, robotics, virtual prototyping for the industry or web contents.Le virtuel est devenu un vaste champ d'exploration pour la recherche et offre de nos jours de nombreuses possibilitĂ©s : assister le chirurgien, rĂ©aliser des prototypes de piĂšces industrielles, simuler des phĂ©nomĂšnes naturels, remonter dans le temps ou proposer des applications ludiques aux utilisateurs au travers de jeux ou de films. Bien plus que le rendu purement visuel d'environnement virtuel, la rĂ©alitĂ© virtuelle aspire Ă  -littĂ©ralement- immerger l'utilisateur dans le monde virtuel. L'utilisateur peut ainsi interagir avec le contenu numĂ©rique et percevoir les effets de ses actions au travers de diffĂ©rents retours sensoriels. Permettre une vĂ©ritable immersion de l'utilisateur dans des environnements virtuels de plus en plus complexes confronte la recherche en rĂ©alitĂ© virtuelle Ă  des dĂ©fis importants: les gestes de l'utilisateur doivent ĂȘtre capturĂ©s puis directement transmis au monde virtuel afin de le modifier en temps-rĂ©el. Les retours sensoriels ne sont pas uniquement visuels mais doivent ĂȘtre combinĂ©s avec les retours auditifs ou haptiques dans une rĂ©ponse globale multimodale. L'objectif principal de mes activitĂ©s de recherche consiste Ă  amĂ©liorer l'interaction 3D avec des environnements virtuels complexes en proposant de nouvelles approches utilisant la simulation physique et exploitant au mieux les diffĂ©rentes modalitĂ©s sensorielles. Dans mes travaux, je m'intĂ©resse tout particuliĂšrement Ă  concevoir des interactions avec des mondes virtuels complexes. Mon approche peut ĂȘtre dĂ©crite au travers de trois axes principaux de recherche: (1) la modĂ©lisation dans les mondes virtuels d'environnements physiques plausibles oĂč les objets rĂ©agissent de maniĂšre naturelle, mĂȘme lorsque leur topologie est modifiĂ©e ou lorsqu'ils sont en interaction avec d'autres objets, (2) la mise en place de retours sensoriels multimodaux vers l'utilisateur intĂ©grant des composantes visuelles, haptiques et/ou sonores, (3) la prise en compte de l'interaction physique de l'utilisateur avec le monde virtuel dans toute sa richesse : mouvements de la tĂȘte, des deux mains, des doigts, des jambes, voire de tout le corps, en concevant de nouveaux dispositifs ou de nouvelles techniques d'interactions 3D. Les diffĂ©rentes contributions que j'ai proposĂ©es dans chacun de ces trois axes peuvent ĂȘtre regroupĂ©es au sein d'un cadre plus gĂ©nĂ©ral englobant toute la boucle d'interaction 3D avec les environnements virtuels. Elles ouvrent des perspectives pour de futures applications en rĂ©alitĂ© virtuelle mais Ă©galement plus gĂ©nĂ©ralement dans d'autres domaines tels que la simulation mĂ©dicale, l'apprentissage de gestes, la robotique, le prototypage virtuel pour l'industrie ou bien les contenus web

    3D Multimodal Interaction with Physically-based Virtual Environments

    Get PDF
    The virtual has become a huge field of exploration for researchers: it could assist the surgeon, help the prototyping of industrial objects, simulate natural phenomena, be a fantastic time machine or entertain users through games or movies. Far beyond the only visual rendering of the virtual environment, the Virtual Reality aims at -literally- immersing the user in the virtual world. VR technologies simulate digital environments with which users can interact and, as a result, perceive through different modalities the effects of their actions in real time. The challenges are huge: the user's motions need to be perceived and to have an immediate impact on the virtual world by modifying the objects in real-time. In addition, the targeted immersion of the user is not only visual: auditory or haptic feedback needs to be taken into account, merging all the sensory modalities of the user into a multimodal answer. The global objective of my research activities is to improve 3D interaction with complex virtual environments by proposing novel approaches for physically-based and multimodal interaction. I have laid the foundations of my work on designing the interactions with complex virtual worlds, referring to a higher demand in the characteristics of the virtual environments. My research could be described within three main research axes inherent to the 3D interaction loop: (1) the physically-based modeling of the virtual world to take into account the complexity of the virtual object behavior, their topology modifications as well as their interactions, (2) the multimodal feedback for combining the sensory modalities into a global answer from the virtual world to the user and (3) the design of body-based 3D interaction techniques and devices for establishing the interfaces between the user and the virtual world. All these contributions could be gathered in a general framework within the 3D interaction loop. By improving all the components of this framework, I aim at proposing approaches that could be used in future virtual reality applications but also more generally in other areas such as medical simulation, gesture training, robotics, virtual prototyping for the industry or web contents.Le virtuel est devenu un vaste champ d'exploration pour la recherche et offre de nos jours de nombreuses possibilitĂ©s : assister le chirurgien, rĂ©aliser des prototypes de piĂšces industrielles, simuler des phĂ©nomĂšnes naturels, remonter dans le temps ou proposer des applications ludiques aux utilisateurs au travers de jeux ou de films. Bien plus que le rendu purement visuel d'environnement virtuel, la rĂ©alitĂ© virtuelle aspire Ă  -littĂ©ralement- immerger l'utilisateur dans le monde virtuel. L'utilisateur peut ainsi interagir avec le contenu numĂ©rique et percevoir les effets de ses actions au travers de diffĂ©rents retours sensoriels. Permettre une vĂ©ritable immersion de l'utilisateur dans des environnements virtuels de plus en plus complexes confronte la recherche en rĂ©alitĂ© virtuelle Ă  des dĂ©fis importants: les gestes de l'utilisateur doivent ĂȘtre capturĂ©s puis directement transmis au monde virtuel afin de le modifier en temps-rĂ©el. Les retours sensoriels ne sont pas uniquement visuels mais doivent ĂȘtre combinĂ©s avec les retours auditifs ou haptiques dans une rĂ©ponse globale multimodale. L'objectif principal de mes activitĂ©s de recherche consiste Ă  amĂ©liorer l'interaction 3D avec des environnements virtuels complexes en proposant de nouvelles approches utilisant la simulation physique et exploitant au mieux les diffĂ©rentes modalitĂ©s sensorielles. Dans mes travaux, je m'intĂ©resse tout particuliĂšrement Ă  concevoir des interactions avec des mondes virtuels complexes. Mon approche peut ĂȘtre dĂ©crite au travers de trois axes principaux de recherche: (1) la modĂ©lisation dans les mondes virtuels d'environnements physiques plausibles oĂč les objets rĂ©agissent de maniĂšre naturelle, mĂȘme lorsque leur topologie est modifiĂ©e ou lorsqu'ils sont en interaction avec d'autres objets, (2) la mise en place de retours sensoriels multimodaux vers l'utilisateur intĂ©grant des composantes visuelles, haptiques et/ou sonores, (3) la prise en compte de l'interaction physique de l'utilisateur avec le monde virtuel dans toute sa richesse : mouvements de la tĂȘte, des deux mains, des doigts, des jambes, voire de tout le corps, en concevant de nouveaux dispositifs ou de nouvelles techniques d'interactions 3D. Les diffĂ©rentes contributions que j'ai proposĂ©es dans chacun de ces trois axes peuvent ĂȘtre regroupĂ©es au sein d'un cadre plus gĂ©nĂ©ral englobant toute la boucle d'interaction 3D avec les environnements virtuels. Elles ouvrent des perspectives pour de futures applications en rĂ©alitĂ© virtuelle mais Ă©galement plus gĂ©nĂ©ralement dans d'autres domaines tels que la simulation mĂ©dicale, l'apprentissage de gestes, la robotique, le prototypage virtuel pour l'industrie ou bien les contenus web
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