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Is Accurate Occlusion of Glossy Reflections Necessary?

Kozlowski, O; Kautz, J; (2007) Is Accurate Occlusion of Glossy Reflections Necessary? In: Spencer, SN, (ed.) APGV 2007: SYMPOSIUM ON APPLIED PERCEPTION IN GRAPHICS AND VISUALIZATION, PROCEEDINGS. (pp. 91 - +). ASSOC COMPUTING MACHINERY

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Abstract

Much research in recent times has been conducted towards realtime rendering of accurate glossy reflections under direct, natural illumination including correct occlusions. The view dependent nature of these reflections will always cause this computation to be expensive unless heavily approximated. There also remains a question as to whether humans are even capable of noticing the difference in accuracy or whether our perception of the realism of the scene remains unchanged and thus the extra effort expended in rendering accurate reflections is effectively wasted. We conduct a user study to analyse any decline in perceived realism of glossy scenes rendered with a variety of specular occlusion approximations under a Multitude of BRDFs, lighting environments and camera orientations. We demonstrate that although no one approximation is always suitable, it is rare to have a scene whose computational complexity cannot be decreased to some degree.

Type:Proceedings paper
Title:Is Accurate Occlusion of Glossy Reflections Necessary?
Event:Symposium on Applied Perception in Graphics and Visualization
Location:Tubingen, GERMANY
Dates:2007-07-25 - 2007-07-27
ISBN-13:978-1-59593-670-7
Keywords:glossy reflections, shadowing, perception, PRECOMPUTED RADIANCE TRANSFER, SURFACE REFLECTANCE, ILLUMINATION, APPROXIMATION, COMPONENTS, PERCEPTION
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Computer Science

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