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Computing global illumination in a moderate time for complex environments and walking through them is one of the challenges in computer graphics. To meet this goal, a prepro-cessing is necessary. This preprocessing consists in partitioning the environment into cells and determining visibility between these cells. Most of the existing partitioning methods(More)
Hierarchical radiosity is a very demanding process in terms of computation time and memory ressources even for scenes of moderate complexity. To handle complex environments, not tting in memory, new solutions have to be devised. One solution is to partition the scene into subsets of polygons (3D cells or clusters) and to maintain in memory only some of(More)
In this paper, we show how to calibrate a camera and to recover the geometry and the photometry (textures) of objects from a single image. The aim of this work is to make it possible walkthrough and augment reality in a 3D model reconstructed from a single image. The calibration step does not need any calibration target and makes only four assumptions: (1)(More)
Plasticity of 3D user interfaces refers to their capabilities to automatically fit to a set of hardware and environmental constraints. This area of research has already been deeply explored in the domain of traditional 2D user interfaces. Besides, during the last decade, interest in 3D user interfaces has grown. Designers find with 3D user interfaces new(More)
In this paper we propose a new metaphor of information retrieving, usable in foundation heritage management and publishing. Based on the net, the user is able to participate in virtual guided tours, sessions of conference-like. A human expert will be the guide for all the connected users. He will use different media (sound/video) to communicate; the members(More)
This paper introduces a new device model and a new interaction technique model to deal with plasticity issues for Virtual Reality (VR) and Augmented Reality (AR). We aim to provide developers with solutions to use and create interaction techniques that will fit to the needed tasks of a 3D application and to the input and output devices available. The device(More)
Recent cultural heritage applications have been based on rich-content virtual environment (VE), in which virtual humans can communicate with visitors and other agents using natural language (NL). We propose to use the semantic modelling of the VE and the activities of the agents for the conceptualisation of the dialogue. Meta level semantic information are(More)
In this paper we propose a new metaphor of information retrieving, usable in heritage management and publishing. Based on the net, the user is able to participate in virtual guided tours, sessions of conferences-like. A human expert will be the guide for all the connected users. He will use different media (sound/video) to communicate; the members of the(More)