D3: an Immersive aided design deformation method

International audienceIn this paper, we introduce a new deformation method adapted to immersive design. The use of Virtual Reality (VR) in the design process implies a physical displacement of project actors and data between the virtual reality facilities and the design office. The decisions taken in the immersive environment are manually reflected on the Computed Aided Design (CAD) system. This increases the design time and breaks the continuity of data workflow. On this basis, there is a clear demand among the industry for tools adapted to immersive design. But few methods exist that encompass CAD problematic in VR. For this purpose, we propose a new method, called D3, for "Draw, Deform and Design", based on a 2 step manipulation paradigm, consisting with 1) area selection and 2) path drawing, and a final refining and fitting phase. Our method is discussed on the basis of a set of CAD deformation scenarios

Modeling of the angular tolerancing of an effective medium diffractive lens using combined finite difference time domain and radiation spectrum method algorithms

International audienceA new rigorous vector-based design and analysis approach of diffractive lenses is presented. It combines the use of two methods: the Finite-Difference Time-Domain for the study in the near field, and the Radiation Spectrum Method for the propagation in the far field. This approach is proposed to design and optimize effective medium cylindrical diffractive lenses for high efficiency structured light illumination systems. These lenses are realised with binary subwavelength features that cannot be designed using the standard scalar theory. Furthermore, because of their finite and high frequencies characteristics, such devices prevent the use of coupled wave theory. The proposed approach is presented to determine the angular tolerance in the cases of binary subwavelength cylindrical lenses by calculating the diffraction efficiency as a function of the incidence angle

A Workflow for Real-time Visualization and Data Analysis of Gesture using Motion Capture

In this paper, we investigate new ways to understand and to analyze human gesture in a research context applied on co-verbal gesture across language. The research project focuses on the quality of the movement and consider the gesture “pulse of effort.“ We propose a workflow for real-time gesture analysis to visualize gesture kinematics features (Velocity, Acceleration, Jerk) from heterogeneous data (Video, Motion Capture and Gesture Annotations) at the same time base. The tools designed here provide immersive and interactive explorations of data: users can test hypotheses and embody gesture visualization and descriptors adopting different Frames of Reference using augmented reality. We have conducted an evaluation protocol in the field of linguistics that compares 496 annotated gestures to benchmark the workflow

Modification interactive de formes en réalité virtuelle : application à la conception d'un produit

The context of this research is the use of virtual reality for product design and development. At the industrial level, the virtual integration reviews are currently limited to static project review, with no possibility of changing the original design. In this work, we present a new method for virtual design review, which aims to enable the user to modify, as naturally as possible, the digital model inside the virtual environment. This method, called D3, is based on three steps: a selection step by drawing, a deformation step by manipulating the selected area and a final refining step that allows engineers to adjust the modifications. For the method to be a means of communication, it has to be simple, intuitive and usable by all project actors. An experiment was performed to evaluate the method in terms of learning curve and errors performed by subjects in a modification task. Finally, in order to facilitate the refining step, this method offers several ways for engineers to reflect the modifications on the CAD model.Ces travaux se placent dans le cadre de l'utilisation de la réalité virtuelle pour la conception et le développement de produits. Les revues d'intégration virtuelles utilisées, au niveau industriel, sont actuellement limitées à la revue de projet statique, sans possibilité de modification de la conception initiale. Nous proposons une méthode destinée à la revue de projet virtuelle, dont le but est de permettre à l'utilisateur de modifier le plus naturellement possible la maquette numérique depuis l'environnement virtuel. Cette méthode appelée D3 est basée sur trois étapes : une étape de sélection par dessin, une étape de déformation par manipulation de la zone sélectionnée et une étape de reprise qui permet aux ingénieurs de reprendre les modifications. Afin que la méthode soit un support de communication, elle se doit d'être simple, intuitive et utilisable par tous. Une expérimentation a été menée dans le but d'évaluer la méthode au niveau de la facilité d'apprentissage et des erreurs commises par les sujets lors d'une tâche de modification. Enfin, dans le but de faciliter le travail de reprise, cette méthode offre plusieurs moyens permettant aux ingénieurs de répliquer les modifications sur la maquette CAO