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Samuli Laine, Timo Aila, Ulf Assarsson, Jaakko Lehtinen and Tomas Akenine-Möller,
"Soft Shadow Volumes for Ray Tracing",
ACM SIGGRAPH 2005.
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Timo Aila, and Tomas Akenine-Möller,
``A Hierarchical Shadow Volume Algorithm'',
to appear in Graphics Hardware 2004, August 2004.
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Ulf Assarsson and Tomas Akenine-Möller,
``Occlusion Culling and Z-fail for Soft Shadow Volume Algorithms'',
The Visual Computer, Volume 20, Numbers 8-9, November 2004.
A draft is available in the link above.
[This paper was previously called ``Interactive Rendering of Soft Shadows using an Optimized and Generalized Penumbra
Wedge Algorithm'']
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Tomas Akenine-Möller and Ulf Assarsson,
``On the Degree of Vertices in a Shadow Volume Silhouette'', journal of graphics tools, vol. 8, no. 4, pp. 21-24, 2003.
Abstract:
In shadow volume rendering, the shadow volume silhouette
edges are used to create primitives that model the shadow volume.
A common misconception is that the vertices on such silhouettes
can only be connected to two silhouette edges, i.e., have degree
two. Furthermore, some believe that such a vertex can have any
degree. In this short note, we present a geometric proof that
shows that the degree of a silhouette vertex must be even, and not
necessarily two.
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Ulf Assarsson, A Real-Time Soft Shadow Volume Algorithm, PhD thesis,
Department of Computer Engineering, Chalmers University of Technology, ISBN 91-7291-333-9, October 2003.
The thesis consists of an introduction, and the five papers listed above.
Ulf defended his thesis on 2003-10-10, and the opponent was Fredo Durand.
Downloads: Lo-res version (29 MB) and
Hi-res version (96 MB).
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Ulf Assarsson, and Tomas Akenine-Möller
``A Geometry-based Soft Shadow Volume Algorithm using Graphics Hardware,''
ACM Transactions on Graphics (Proceedings of ACM SIGGRAPH), vol. 22, no. 3, pp. 511-520, July 2003.
PowerPoint slides without movie clips.
Movie clips:
Clip 1 (89 MB),
Clip 2 (35 MB),
Clip 3 (18 MB),
Clip 4 (61 MB),
Clip 5 (16MB) (same as Clip 1 in next paper),
Clip 6 (86MB) (same as Clip 5 but larger).
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Ulf Assarsson, Michael Dougherty, Michael Mounier, and Tomas Akenine-Möller,
``An Optimized Soft Shadow Volume Algorithm with
Real-Time Performance'',
Graphics Hardware 2003, pp. 33-40, p. 131, July 2003.
PowerPoint slides without movie clips.
Movie clips:
Clip 1 (16MB)
Clip 2 (86MB) (same as clip 1, but larger).
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Tomas Akenine-Möller and Ulf Assarsson,
``Approximate Soft Shadows on Arbitrary Surfaces using Penumbra Wedges,''
13th Eurographics Workshop on Rendering 2002, pp. 309-318, June 2002.
PowerPoint slides without movie clips.
Note: in this paper we had not realized that
each silhouette vertex must be connected to an even number of silhouette
edges. Since this is so (we prove this in our "On the Degree of Vertices in a Shadow Volume Silhouette" paper below),
we can split each silhouette into one or more several single closed loops, and thus
our algorithm can handle many more surfaces that we state in the paper.
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