Title: Fast penumbra calculation in ray tracing
Authors: Formella, Arno
Łukaszewski, Andrzej
Citation: Journal of WSCG. 1998, vol. 6, no. 1-3, p. 238-245.
Issue Date: 1998
Publisher: Václav Skala - UNION Agency
Document type: článek
URI: http://hdl.handle.net/11025/15859
ISSN: 1213-6972 (print)
1213-6980 (CD-ROM)
1213-6964 (online)
Keywords: výpočet stínu;stochastické vykreslování;Minkowského operátoři;ofsety
Keywords in different language: shadow calculation;stochastic ray tracing;Minkowski operators;offsets
Abstract in different language: Penumbras, or soft shadows, are an important means to enhance the realistic apperance of computer generated images. We present a fast method based on Minkowski operators to reduce the run time for penumbra calculation with stochastic ray tracing. Detailed run time analysis on some examples shows that the new method is significantly faster than the conventional approach. Moreover, it adapts to the environment so that small penumbras are calculated faster than larger ones. The algorithm needs at most twice as much memory as the underlying ray tracing algorithm.
Rights: © Václav Skala - UNION Agency
Appears in Collections:Volume 6, number 1-3 (1998)

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