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In this paper, we show how to capture an actor with no intrusive trackers and without any special environment like blue set, how to estimate its 3D-geometry and how to insert this geometry into a virtual world in real-time. We use several cameras in conjunction with background subtraction to produce silhouettes of the actor as observed from the different(More)
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt età la diffusion(More)
Linear perspective projections are used extensively in graphics. They provide a non-distorted view, with simple computations that map easily to hardware. Non-linear projections, such as the view given by a fish-eye lens are also used, either for artistic reasons or in order to provide a larger field of view, <i>e.g.</i> to approximate environment(More)
Animating lava flowing down the slopes of a volcano brings several challenges: modeling the mechanical features of lava and how they evolve over time depending on temperature; computing, in a reasonable time, the interactions inside the flow, and between the flow and a complex terrain database ; and lastly, rendering the visual aspect of the flow. The(More)
We present here a sculpture metaphor for rapid shape-prototyping. The sculpted shape is the iso-surface of a scalar field spatially sampled. The user can deposit material wherever he desires in space and then iteratively refine it using a freeform tool. The tool shape can be designed inside the application. The tool can add, remove, paint or smooth(More)
Figure 1: Walkthrough with a dynamic canvas. Note how the grain of the paper follows the strokes. Abstract The static background paper or canvas texture usually used for non-photorealistic animation greatly impedes the sensation of motion and results in a disturbing " shower door " effect. We present a method to animate the background canvas for(More)
We present a new method to compute the impulse response (IR) of a given virtual room based on hierarchical radiosity. Unlike previous work, our approach can treat complex geometries and is listening-position-independent. Moreover, complex phenomena such as sound diffraction are also taken into account. The acoustical quality of a room may be evaluated from(More)