Light Space Cascaded Shadow Maps Algorithm for Real Time Rendering |
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| Authors: | Xiao-Hui Liang Shang Ma Li-Xia Cen Zhuo Yu |
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| Affiliation: | (1) State Key Lab. of Virtual Reality Technology and Systems, School of Computer Science and Engineering, Beihang University, Beijing, 100191, China |
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| Abstract: | Owing to its generality and efficiency, Cascaded Shadow Maps (CSMs) has an important role in real-time shadow rendering in
large scale and complex virtual environments. However, CSMs suffers from redundant rendering problem | objects are rendered
undesirably to different shadow map textures when view direction and light direction are not perpendicular. In this paper,
we present a light space cascaded shadow maps algorithm. The algorithm splits a scene into non-intersecting layers in light
space, and generates one shadow map for each layer through irregular frustum clipping and scene organization, ensuring that
any shadow sample point never appears in multiple shadow maps. A succinct shadow determination method is given to choose the
optimal shadow map when rendering scenes. We also combine the algorithm with stable cascaded shadow maps and soft shadow algorithm
to avoid shadow flicking and produce soft shadows. The results show that the algorithm effectively improves the efficiency
and shadow quality of CSMs by avoiding redundant rendering, and can produce high-quality shadow rendering in large scale dynamic
environments with real-time performance. |
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