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Packet-based Hierarchal Soft Shadow Mapping

Yang Baoguang 1, 2 Jieqing Feng 1 Gael Guennebaud 3, 4 Xinguo Liu 1
4 IPARLA - Visualization and manipulation of complex data on wireless mobile devices
CNRS - Centre National de la Recherche Scientifique : UMR5800, École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB), Inria Bordeaux - Sud-Ouest, Université Sciences et Technologies - Bordeaux 1
Abstract : Recent soft shadow mapping techniques based on back-projection can render high quality soft shadows in real time. However, real time high quality rendering of large penumbrae is still challenging, especially when multi-layer shadow maps are used to reduce single light sample silhouette artifact. In this paper, we present an efficient algorithm to attack this problem. We first present a GPU-friendly packet-based approach rendering a packet of neighboring pixels together to amortize the cost of computing visibility factors. Then, we propose a hierarchical technique to quickly locate the contour edges, further reducing the computation cost. At last, we suggest a multi-view shadow map approach to reduce the single light sample artifact. We also demonstrate its higher image quality and higher efficiency compared to the existing depth peeling approaches.
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Submitted on : Monday, May 23, 2011 - 4:14:37 PM
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Yang Baoguang, Jieqing Feng, Gael Guennebaud, Xinguo Liu. Packet-based Hierarchal Soft Shadow Mapping. Computer Graphics Forum, Wiley, 2009, Proceedings of Eurographics Symposium on Rendering 2009, 28 (4), pp.1121--1130. ⟨inria-00390541⟩



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