Technologies d'aujourd'hui et de demain pour la numérisation et la manipulation de modèles 3D

International audienceVirtual mockups show numerous advantages against the manipulation of real archeological objects. However, using them in the best way require various software tools, but also the correct and most efficient hardware. Relying on our long experience in the virtual reality hardware domain, this paper describe the various solutions from today and the ones that will be available tomorrow, which will help the digitization process and enhance the use of 3D models. The paper therefore copes with every aspect of the simulation work by detailing the digitization step, the various visualization interfaces and the interaction tools.L’intérêt d’utiliser des maquettes virtuelles en lieu et place d’objets réels n’est plus à démontrer. Leur valorisation repose cependant sur de nombreux outils logiciels, mais également matériels. Se reposant sur notre longue expérience dans le domaine du matériel de Réalité Virtuelle, cet article a pour objectif de décrire les solutions existantes et futures qui facilitent et optimisent la numérisation et l’utilisation du modèle 3D. Il abordera chacune des étapes de la chaîne de simulation, et détaillera ainsi l’étape de numérisation, les interfaces de visualisation et les outils d’interaction

3DC2 : a multiple view interactive platform

International audienceCet article présente un prototype de 3DC21, un système interactif multi-opérateur multi-vues. Ce système a pour principale caractéristique la possibilité de présenter deux vues 3D stéréoscopiques distinctes à deux opérateurs travaillant sur la même surface interactive. Il a pour cible applicative des contextes de travail coopératif pour lesquels la 3D est primordiale. Il est démontré sur un scénario de surveillance urbaine à base de drones aéroportés

Toucheo: Multitouch and Stereo Combined in a Seamless Workspace.

International audienceWe propose a new system that efficiently combines direct multitouch interaction with co-located 3D stereoscopic visualization. In our approach, users benefit from well-known 2D metaphors and widgets displayed on a monoscopic touchscreen, while visualizing occlusion-free 3D objects floating above the surface at an optically correct distance. Technically, a horizontal semi-transparent mirror is used to reflect 3D images produced by a stereoscopic screen, while the user's hand as well as a multitouch screen located below this mirror remain visible. By registering the 3D virtual space and the physical space, we produce a rich and unified workspace where users benefit simultaneously from the advantages of both direct and indirect interaction, and from 2D and 3D visualizations. A pilot usability study shows that this combination of technology provides a good user experience

An Immersive Multitouch Workspace

International audienceWe propose a new system that efficiently combines direct multitouch interaction and 3D stereoscopic visualization. In our approach, users interact by way of simple 2D gestures on a monoscopic touchscreen, while visualizing occlusion-free 3D stereoscopic objects floating above the surface at an optically correct distance. By registering the 3D virtual space with the physical space, we produce a rich seamless workspace where both the advantages of direct and indirect interaction are jointly exploited. In addition to standard multitouch gestures and controls (e.g. pan, zoom, and standard 2D widgets) from which we take advantage, we have designed a dedicated multitouch 3D transformation widget. This widget allows the near-direct control of rotations, scaling, and translations of the manipulated objects. To illustrate the power of our setup, we have designed a demo scenario where participants reassemble 3D virtual fragments. This scenario, as many others, takes benefit of our proposal, where the strength of both multitouch interaction and stereoscopic visualization are unified in an innovative and relevant workspace

Mosaic Activating Mutations in GNA11 and GNAQ Are Associated with Phakomatosis Pigmentovascularis and Extensive Dermal Melanocytosis.

Common birthmarks can be an indicator of underlying genetic disease but are often overlooked. Mongolian blue spots (dermal melanocytosis) are usually localized and transient, but they can be extensive, permanent, and associated with extracutaneous abnormalities. Co-occurrence with vascular birthmarks defines a subtype of phakomatosis pigmentovascularis, a group of syndromes associated with neurovascular, ophthalmological, overgrowth, and malignant complications. Here, we discover that extensive dermal melanocytosis and phakomatosis pigmentovascularis are associated with activating mutations in GNA11 and GNAQ, genes that encode Gα subunits of heterotrimeric G proteins. The mutations were detected at very low levels in affected tissues but were undetectable in the blood, indicating that these conditions are postzygotic mosaic disorders. In vitro expression of mutant GNA11(R183C) and GNA11(Q209L) in human cell lines demonstrated activation of the downstream p38 MAPK signaling pathway and the p38, JNK, and ERK pathways, respectively. Transgenic mosaic zebrafish models expressing mutant GNA11(R183C) under promoter mitfa developed extensive dermal melanocytosis recapitulating the human phenotype. Phakomatosis pigmentovascularis and extensive dermal melanocytosis are therefore diagnoses in the group of mosaic heterotrimeric G-protein disorders, joining McCune-Albright and Sturge-Weber syndromes. These findings will allow accurate clinical and molecular diagnosis of this subset of common birthmarks, thereby identifying infants at risk for serious complications, and provide novel therapeutic opportunities

Image-based analysis for model-based tracking

International audienc

Human Motion Perception through Video Model-based Tracking

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Model-Based Video Tracking for Gestural Interaction

International audienc

Silhouettes pour le suivi temps réel basé modèle

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Hand posture recognition in large display VR environments

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