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Occlusion culling and z-fail for soft shadow volume algorithms

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Abstract

This paper presents a significant improvement of our previously proposed soft shadow volume algorithm for simulating soft shadows. By restructuring the algorithm, we can considerably simplify the computations, introduce efficient occlusion culling with speedups of 3–4 times, thus approaching real-time performance. We can also generalize the algorithm to produce correct shadows even when the eye is inside a shadowed region (using z-fail). We present and evaluate a three pass implementation of the restructured algorithm for near real-time rendering of soft shadows on a computer with a commodity graphics accelerator. However, preferably the rendering of the wedges should be implemented in hardware, and for this we suggest and evaluate a single pass algorithm.

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References

  1. Akenine-Möller T, Assarsson U (2002) Approximate soft shadows on arbitrary surfaces using penumbra wedges. 13th Eurographics Workshop on Rendering. Eurographics, pp 309–318

  2. Assarsson U, Akenine-Möller T (2003) A geometry-based soft shadow volume algorithm using graphics hardware. Proceedings of ACM SIGGRAPH 2003, pp 511–520

  3. Assarsson U, Dougherty M, Mounier M, Akenine-Möller T (2003) An optimized soft shadow volume algorithm with real-time performance. Graphics Hardware 2003, ACM SIGGRAPH/Eurographics Workshop Proceedings, pp 33–40

  4. Everitt C, Kilgard MJ (2002) Practical and robust stenciled shadow volumes for hardware-accelerated rendering. http://developer.nvidia.com/

  5. Crow FC (1977) Shadow algorithms for computer graphics. SIGGRAPH ’77 Proceedings, pp 242–248

  6. Gottschalk S, Lin MC, Manocha D (1996) OBBTree: a hierarchical structure for rapid interference detection. Computer Graphics (SIGGRAPH Proceedings ’96), pp 171–180

  7. Greene N (1994) Detecting intersection of a rectangular solid and a convex polyhedron. In: Heckbert PS (ed) Graphics gems IV, pp 74–82

  8. Haines EA, Wallace JR (1994) Shaft culling for efficient ray-traced radiosity. Photorealistic rendering in computer graphics. (Proceedings of the Second Eurographics Workshop on Rendering), Springer, Berlin Heidelberg New York, pp 122–138

  9. Haines E, Möller T (2001) Real-time shadows. Game Developers Conference, March 2001, pp 335–352

  10. Heidmann T (1991) Real shadows, real time. Iris Universe, Silicon Graphics Inc., No. 18, pp 23–31

  11. Morein S (2000) ATI Radeon—HyperZ Technology. SIGGRAPH/Eurographics Graphics Hardware Workshop 2000, Hot3D session

  12. Parker S, Shirley P, Smits B (1999) Single sample soft shadows. TR UUCS-98-019, Computer Science Department, University of Utah

  13. Soler C, Sillion FX (1998) Fast calculation of soft shadow textures using convolution. SIGGRAPH ’98 Proceedings, pp 321–332

  14. Woo A, Poulin P, Fournier A (1990) A survey of shadow algorithms. IEEE Comput Graph Appl 10(6):13–32

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Authors and Affiliations

  1. Department of Computer Engineering, Chalmers University of Technology, Gothenburg, 412 63, Sweden

    Ulf Assarsson & Tomas Akenine-Möller

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  1. Ulf Assarsson
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  2. Tomas Akenine-Möller
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Correspondence to Tomas Akenine-Möller.

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Assarsson, U., Akenine-Möller, T. Occlusion culling and z-fail for soft shadow volume algorithms. Vis Comput 20, 601–612 (2004). https://doi.org/10.1007/s00371-004-0254-2

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  • DOI: https://doi.org/10.1007/s00371-004-0254-2

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