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High-Quality Adaptive Soft Shadow Mapping
Authors:Gaël Guennebaud  Loïc Barthe  Mathias Paulin
Affiliation:ETH Zurich;IRIT - UniversitéPaul Sabatier
Abstract:The recent soft shadow mapping technique GBP06] ] allows the rendering in real-time of convincing soft shadows on complex and dynamic scenes using a single shadow map. While attractive, this method suffers from shadow overestimation and becomes both expensive and approximate when dealing with large penumbrae. This paper proposes new solutions removing these limitations and hence providing an efficient and practical technique for soft shadow generation. First, we propose a new visibility computation procedure based on the detection of occluder contours, that is more accurate and faster while reducing aliasing. Secondly, we present a shadow map multi-resolution strategy keeping the computation complexity almost independent on the light size while maintaining high-quality rendering. Finally, we propose a view-dependent adaptive strategy, that automatically reduces the screen resolution in the region of large penumbrae, thus allowing us to keep very high frame rates in any situation.
Keywords:I  3  7 [Computer Graphics]: Three-Dimensional Graphics and RealismColor  shading  shadowing  and texture
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