Control on Color Reflection Behavior

نویسندگان

  • Xavier Granier
  • Cyrille Damez
چکیده

Nowadays, most of the computation of a rendering system is done in color space. Thus, the whole process, from acquisition (with a digital camera) and modelisation to display (on CRT/LCD displays) is color-based. Unfortunately, the re ection of a light on a surface is based on an approximation which can reduce the preservation of the color appearance. In this report, we present a new approach for color-based re ection that introduces a low overhead for an easy integration in current rendering systems. This approach allows also an easier control on the re ection behavior. In this report, we present also some possible applications, including global illumination, simple relighting and hardware rendering. Key-words: Rendering, Illumination, Re ectance and Shading Models, Global Illumination, Relighting, Real-Time Rendering ∗ currently working at allegorithmic Contrôle sur le Comportement de la Réflexion en Espace de Couleur Résumé : Dans la grande majorité des systèmes de création d'images de synthèse, les calculs y sont e ectués dans des espaces de couleur. Ainsi, tout le processus, de l'acquisition(avec par exemple un appareil photo numérique) et de la modélisation, vers l'a chage (comme sur des écrans CRT ou LCD), se déroule dans une même espace de travail, celui de la couleur. Cependant, cela entraîne une approximation dans le calcul de la ré exion d'un source de lumière sur une surface, réduisant notamment la possibilité de préserver l'apparence colorée d'un matériau. Dans ce rapport, nous présentons une nouvelle approche pour le calcul des ré exions dans un espace de couleur, approche qui n'introduit que de faibles changement dans le processus actuel, a n d'y faciliter son intégration. Elle permet aussi un certain contrôle sur le comportement de la ré exion. En n, nous présentons aussi les possibilités d'application pour cette méthode, comme le calcul de solution d'éclairage global, du ré-éclairage, ou du rendu sur carte graphique. Mots-clés : Rendu, Éclairage, Propriétés de Ré exion, Éclairage Global, Rééclairagre, Rendu Temps-Réel Control on Color Reflection Behavior 3

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تاریخ انتشار 2008