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Theses

Simulateur pour l'étude de la visibilité dans les environnements enfumés.

Abstract : Light simulation can be used to study and analyse the visual comfort as well as the performance of lighting devices. To meet this objective, the used methods have to provide an exact solution to the global illumination problem. Another complexity is due to the fact that light simulation has to be performed for geometrically complex scenes and realistic photometric properties of light sources (artificial and natural) and materials. The goal of this thesis is to provide fast global illumination solutions for scenes containing participating media such as smoke. The smoke distribution and its density are scalable, and the observer moves through the virtual scene. This kind of solution could be helpful for fire emergency. After a complete analysis of the problem (light interaction with materials and with smoke), our work is divided into three parts. In the first time, we present a new method to solve the global illumination problem for surface objects based on the irradiance cache method. Our method makes use of records with an influence zone which adapts to geometry and lighting variations. We called this records \textit{adaptive records}. With this method, the cache density can be controled and high lighting variations (represented by irradiance gradients) can be precomputed and stored in the irradiance cache. Then, we address the global illumination problem for scenes containing static participating media. We propose a new method which is an extension to participating media of our work on irradiance cache with adaptive records. Volume records are created in the participating media depending on its scattering coefficients (diffusion and absorption). Finally, we extend this work to dynamics smokes whose shape varies spatially and temporally. To this end, adaptive spatio-temporal surface and volume records are introduced and used for interpolation purpose together with spatial and temporal gradients.
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https://tel.archives-ouvertes.fr/tel-00556718
Contributor : Mickaël Ribardière <>
Submitted on : Monday, January 17, 2011 - 4:01:40 PM
Last modification on : Monday, March 21, 2016 - 5:26:36 PM
Long-term archiving on: : Tuesday, November 6, 2012 - 11:40:14 AM

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  • HAL Id : tel-00556718, version 1

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Mickaël Ribardière. Simulateur pour l'étude de la visibilité dans les environnements enfumés.. Modélisation et simulation. Université Rennes 1, 2010. Français. ⟨tel-00556718⟩

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