Représentations alternatives du détail visuel pour le rendu en temps-réel

Lionel Baboud 1
1 ARTIS - Acquisition, representation and transformations for image synthesis
Inria Grenoble - Rhône-Alpes, LJK - Laboratoire Jean Kuntzmann, INPG - Institut National Polytechnique de Grenoble
Abstract : This thesis takes place in the context of real-time image synthesis. It addresses the problem of efficient rendering for visual detail, main component of an image's realism. To cope with the complexity of visual detail it is necessary to possess representations which are adapted to objects that are to be rendered, together with capabilities of modern graphics processors. The first research effort concerns the use of relief for efficiently representing and rendering geometrical detail. The compact and structured representation of relief by an height map allows to design efficient and accurate rendering algorithms. We propose two of them: the first one can render animated reliefs, while the second one focuses on static ones by exploiting the possibility to preprocess the height map. We also develop a consideration on the use of relief for the representation of general surfaces, and present an application for real-time rendering of realistic water volumes. The second research effort focuses on non-surfacic representations, necessary when geometrical representations are inadequate or even non-existent. It is notably the case of distant objects or objects possessing a dense geometry, like a tree's foliage for example. The problem here is to be able to represent the visual aspect of an object without resorting to any geometrical model. We propose a method taking the light-field of an object as only input data, to determine the optimal parameters for an efficiently renderable representation.
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Lionel Baboud. Représentations alternatives du détail visuel pour le rendu en temps-réel. Informatique [cs]. Université Joseph-Fourier - Grenoble I, 2009. Français. ⟨tel-00452293⟩

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