Boundary Correct Real-Time Soft Shadows

Bjarke Jacobsen; Niels Jørgen Christensen; Bent Dalgaard Larsen; Kim S. Pedersen

doi:10.1109/CGI.2004.1309215

Boundary Correct Real-Time Soft Shadows

Bjarke Jacobsen
, Niels Jørgen Christensen
, Bent Dalgaard Larsen
, Kim S. Pedersen

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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Abstract

This paper describes a method to determine correct shadow boundaries from an area light source using umbra and penumbra volumes. The light source is approximated by a circular disk as this gives a fast way to extrude the volumes. The method also gives a crude estimate of the visibility of the area light source as seen from a point in the shadow region. Instead of rendering the volumes to the stencil buffer, we use an extended shadow map - a so-called D-buffer, which among other things stores distances from the center of the light source to the umbra and penumbra volumes. The method is suited for implementation on most programmable hardware. Though some crude approximations are used in the visibility function, the method can be used to produce soft shadows with correct boundaries in real time.

Original language	English
Title of host publication	Computer Graphics International
Publisher	IEEE Computer Society Press
Publication date	2004
ISBN (Print)	0-7695-2171-1
DOIs	https://doi.org/10.1109/CGI.2004.1309215
Publication status	Published - 2004
Event	Computer Graphics International, 2004 - Duration: 1 Jan 2004 → …

Conference

Conference	Computer Graphics International, 2004
Period	01/01/2004 → …

Bibliographical note

Copyright: 2004 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

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title = "Boundary Correct Real-Time Soft Shadows",

abstract = "This paper describes a method to determine correct shadow boundaries from an area light source using umbra and penumbra volumes. The light source is approximated by a circular disk as this gives a fast way to extrude the volumes. The method also gives a crude estimate of the visibility of the area light source as seen from a point in the shadow region. Instead of rendering the volumes to the stencil buffer, we use an extended shadow map - a so-called D-buffer, which among other things stores distances from the center of the light source to the umbra and penumbra volumes. The method is suited for implementation on most programmable hardware. Though some crude approximations are used in the visibility function, the method can be used to produce soft shadows with correct boundaries in real time.",

author = "Bjarke Jacobsen and Christensen, \{Niels J{\o}rgen\} and Larsen, \{Bent Dalgaard\} and Pedersen, \{Kim S.\}",

note = "Copyright: 2004 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE; Computer Graphics International, 2004 ; Conference date: 01-01-2004",

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isbn = "0-7695-2171-1",

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AU - Christensen, Niels Jørgen

AU - Larsen, Bent Dalgaard

AU - Pedersen, Kim S.

N1 - Copyright: 2004 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

PY - 2004

Y1 - 2004

N2 - This paper describes a method to determine correct shadow boundaries from an area light source using umbra and penumbra volumes. The light source is approximated by a circular disk as this gives a fast way to extrude the volumes. The method also gives a crude estimate of the visibility of the area light source as seen from a point in the shadow region. Instead of rendering the volumes to the stencil buffer, we use an extended shadow map - a so-called D-buffer, which among other things stores distances from the center of the light source to the umbra and penumbra volumes. The method is suited for implementation on most programmable hardware. Though some crude approximations are used in the visibility function, the method can be used to produce soft shadows with correct boundaries in real time.

AB - This paper describes a method to determine correct shadow boundaries from an area light source using umbra and penumbra volumes. The light source is approximated by a circular disk as this gives a fast way to extrude the volumes. The method also gives a crude estimate of the visibility of the area light source as seen from a point in the shadow region. Instead of rendering the volumes to the stencil buffer, we use an extended shadow map - a so-called D-buffer, which among other things stores distances from the center of the light source to the umbra and penumbra volumes. The method is suited for implementation on most programmable hardware. Though some crude approximations are used in the visibility function, the method can be used to produce soft shadows with correct boundaries in real time.

U2 - 10.1109/CGI.2004.1309215

DO - 10.1109/CGI.2004.1309215

M3 - Article in proceedings

SN - 0-7695-2171-1

BT - Computer Graphics International

PB - IEEE Computer Society Press

T2 - Computer Graphics International, 2004

Y2 - 1 January 2004

ER -

Boundary Correct Real-Time Soft Shadows

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