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A fast shadow algorithm for area light sources using backprojection

Authors:

George Drettakis,

Eugene FiumeAuthors Info & Claims

SIGGRAPH '94: Proceedings of the 21st annual conference on Computer graphics and interactive techniques

Pages 223 - 230

https://doi.org/10.1145/192161.192207

Published: 24 July 1994 Publication History

Abstract

The fast identification of shadow regions due to area light sources is necessary for realistic rendering and for discontinuity meshing for global illumination. A new shadow-determination algorithm is presented that uses a data structure, called a backprojection, to represent the visible portion of a light source from any point in the scene. A complete discontinuity meshing algorithm is described for polyhedral scenes and area light sources, which includes an important class of light/geometry interactions that have not been implemented before. A fast incremental algorithm for computing backprojections is also described. The use of spatial subdivision, and heuristics based on computed statistics of typical scenes, results in efficient mesh and backprojection computation. Results of the implementation show that the use of the backprojection and discontinuity meshing permits accelerated high-quality rendering of shadows using both ray-casting and polygon-rendering with interpolants.

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Cited By

Fisher-Gewirtzman D(2014)3D LOS Visibility Analysis Model: Incorporating Quantitative/Qualitative Aspects in Urban EnvironmentsGeodesign by Integrating Design and Geospatial Sciences10.1007/978-3-319-08299-8_14(219-236)Online publication date: 25-Nov-2014
https://doi.org/10.1007/978-3-319-08299-8_14
Leblanc LPoulin P(2013)Guaranteed Occlusion and Visibility in Cluster Hierarchical RadiosityRendering Techniques 200010.1007/978-3-7091-6303-0_9(89-100)Online publication date: 22-Jun-2013
https://doi.org/10.1007/978-3-7091-6303-0_9
Kolivand HSunar MRehman AAltameem A(2013)Simulated real-time soft shadow in mixed reality using fuzzy logic3D Research10.1007/3DRes.03(2013)14:3(1-8)Online publication date: 1-Sep-2013
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Index Terms

A fast shadow algorithm for area light sources using backprojection
1. Computing methodologies
  1. Computer graphics
    1. Image manipulation
      1. Texturing

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cover image ACM Conferences

SIGGRAPH '94: Proceedings of the 21st annual conference on Computer graphics and interactive techniques

July 1994

512 pages

ISBN:0897916670

DOI:10.1145/192161

Chairmen:
Dino Schweitzer
US Air Force Academy, Colorado
,
Andrew Glassner,
Mike Keeler

Copyright © 1994 ACM.

Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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Published: 24 July 1994

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SIGGRAPH '94 Paper Acceptance Rate 57 of 242 submissions, 24%;

Overall Acceptance Rate 1,822 of 8,601 submissions, 21%

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Cited By

Fisher-Gewirtzman D(2014)3D LOS Visibility Analysis Model: Incorporating Quantitative/Qualitative Aspects in Urban EnvironmentsGeodesign by Integrating Design and Geospatial Sciences10.1007/978-3-319-08299-8_14(219-236)Online publication date: 25-Nov-2014
https://doi.org/10.1007/978-3-319-08299-8_14
Leblanc LPoulin P(2013)Guaranteed Occlusion and Visibility in Cluster Hierarchical RadiosityRendering Techniques 200010.1007/978-3-7091-6303-0_9(89-100)Online publication date: 22-Jun-2013
https://doi.org/10.1007/978-3-7091-6303-0_9
Kolivand HSunar MRehman AAltameem A(2013)Simulated real-time soft shadow in mixed reality using fuzzy logic3D Research10.1007/3DRes.03(2013)14:3(1-8)Online publication date: 1-Sep-2013
https://dl.acm.org/doi/10.1007/3DRes.03%282013%291
Woo APoulin P(2012)BibliographyShadow Algorithms Data Miner10.1201/b11901-9(197-238)Online publication date: 23-Aug-2012
https://doi.org/10.1201/b11901-9
Eisemann ESchwarz MAssarsson UWimmer M(2011)BibliographyReal-Time Shadows10.1201/b11030-19(353-375)Online publication date: 14-Jul-2011
https://doi.org/10.1201/b11030-19
Andersson MJohnsson BMunkberg JClarberg PHasselgren JAkenine-Möller T(2011)Efficient multi-view ray tracing using edge detection and shader reuseThe Visual Computer: International Journal of Computer Graphics10.1007/s00371-011-0560-427:6-8(665-676)Online publication date: 1-Jun-2011
https://dl.acm.org/doi/10.1007/s00371-011-0560-4
Hardt STeller S(2011)High-Fidelity Radiosity Rendering at Interactive RatesRendering Techniques ’9610.1007/978-3-7091-7484-5_8(71-80)Online publication date: 14-Dec-2011
https://doi.org/10.1007/978-3-7091-7484-5_8
Drettakis GSillion F(2011)Accurate Visibility and Meshing Calculations for Hierarchical RadiosityRendering Techniques ’9610.1007/978-3-7091-7484-5_27(269-278)Online publication date: 14-Dec-2011
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Durand FDrettakis GPuech C(2011)The 3D visibility complex : a new approach to the problems of accurate visibilityRendering Techniques ’9610.1007/978-3-7091-7484-5_25(245-256)Online publication date: 14-Dec-2011
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Ouellette MFiume E(2011)Approximating the Location of Integrand Discontinuities for Penumbral Illumination with Area Light SourcesRendering Techniques’ 9910.1007/978-3-7091-6809-7_19(213-224)Online publication date: 20-Sep-2011
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