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<dc:title xml:lang="fr">Génération procédurale et rendu en temps réel de motifs structurés</dc:title>
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<dc:subject xml:lang="fr">Informatique graphique</dc:subject>
<dc:subject xml:lang="fr">Fonction de transfert</dc:subject>
<dc:subject xml:lang="fr">Génération de textures</dc:subject>
<dc:subject xml:lang="fr">Génération procédurale</dc:subject>
<dc:subject xml:lang="fr">Motifs structurés</dc:subject>
<dc:subject xml:lang="fr">Temps réel</dc:subject>
<dc:subject xml:lang="fr">Filtrage</dc:subject>
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<dc:subject xml:lang="en">Computer graphics</dc:subject>
<dc:subject xml:lang="en">Transfer function</dc:subject>
<dc:subject xml:lang="en">Texture synthesis</dc:subject>
<dc:subject xml:lang="en">Procedural generation</dc:subject>
<dc:subject xml:lang="en">Structured patterns</dc:subject>
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<dcterms:abstract xml:lang="fr">Dans un monde virtuel, les objets représentés sont décrits autant par leur géométrie que par le comportement lumineux de leur surface. Ce dernier est un élément important pour le réalisme de la scène créée. Pour simuler le comportement lumineux des surfaces, une méthode couramment utilisée consiste à recouvrir la géométrie des objets avec des textures.Dans cette thèse, nous nous intéressons aux textures stochastiques structurées. Et plus particulièrement à leur génération et à leur rendu multi-échelle en temps réel. Ces textures se caractérisent par un caractère stochastique qui leur donne une apparence plus organique et naturelle, et de brusques variations de couleur ou de contraste, faisant apparaître des motifs distincts que nous appelons structures.Nous proposons une nouvelle méthode de génération procédurale de motifs structurés. Celle-ci se base sur la composition d'un bruit procédural vectoriel par une fonction de transfert multi-variée. Cette méthode permet de tirer parti de la séparation entre l'information de structure, contenue dans la fonction de transfert, et le côté stochastique, apporté par le bruit.</dcterms:abstract>
<dcterms:abstract xml:lang="en">In a virtual world, objects represented are described as much by their geometry as by the luminous behaviour of their surface. The latter is an important element in the realism of the scene created. To simulate the luminous behaviour of surfaces, a commonly used method consists of covering the geometry of objects with textures.In this thesis, we focus on structured stochastic textures. More specifically, we are interested in their generation and rendering at different level of detail, in real time. These textures are characterised by a stochastic nature which gives them a more organic and natural appearance, and by abrupt variations in colour or contrast giving rise to distinct patterns which we call structures.We propose a new method for procedural generation of structured patterns. It is based on the composition of a procedural vector noise by a multivariate transfer function. This method takes advantage of the separation between the structural information contained in the transfer function and the stochastic information provided by the noise.</dcterms:abstract>
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