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  Shadow Computation: A Unified Perspective

Ghali, S., Fiume, E., & Seidel, H.-P. (2000). Shadow Computation: A Unified Perspective. In European Association for Computer Graphics 21st Annual Conference (Eurographics-00), State of The Art Reports (pp. 1-17). Aire-la-Ville, Switzerland: Eurographics.

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 Creators:
Ghali, Sherif1, Author           
Fiume, Eugene, Author
Seidel, Hans-Peter1, Author           
Affiliations:
1Computer Graphics, MPI for Informatics, Max Planck Society, ou_40047              

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 Abstract: Methods for solving shadow problems by solving instances of visibility problems have long been known and exploited. There are, however, other potent uses of such a reduction of shadow problems, several of which we explore in this paper. Specifically, we describe algorithms that use a resolution--independent, or object--space, visibility structure for the computation of object--space shadows under point, linear, and area light sources. The connection between object--space visibility and shadow computation is well--known in computer graphics. We show how that fundamental observation can be recast and generalized within an object--space visibility structure. The edges in such a structure contain exactly the information needed to determine shadow edges under a point light source. Also, the locations along a linear or an area light source at which visibility changes (termed critical points and critical lines) provide the necessary information for computing shadow edges resulting from linear and area light sources. Not only are instances of all shadow problems thus reduced to visibility problems, but instances of shadow problems under linear and area light sources are also reduced to instances of shadow generation under point and linear light sources, respectively.

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Language(s): eng - English
 Dates: 2010-03-122000
 Publication Status: Issued
 Pages: -
 Publishing info: Aire-la-Ville, Switzerland : Eurographics
 Table of Contents: -
 Rev. Type: -
 Identifiers: eDoc: 520178
URI: http://www.eg.org/EG/DL/Conf/EG2000/STARs/shadows.pdf
Other: Local-ID: C125675300671F7B-372A630CCFB3F6E1C1256A01005DBD20-Ghali:2000:EGSTAR
 Degree: -

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Title: Untitled Event
Place of Event: Interlaken, Switzerland
Start-/End Date: 2000

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Title: European Association for Computer Graphics 21st Annual Conference (Eurographics-00), State of The Art Reports
Source Genre: Proceedings
 Creator(s):
Affiliations:
Publ. Info: Aire-la-Ville, Switzerland : Eurographics
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 1 - 17 Identifier: -