Soft shadow volumes for ray tracing
(2005) In ACM Transactions on Graphics 24(3). p.1156-1165- Abstract
- We present a new, fast algorithm for rendering physically-based soft shadows in ray tracing-based renderers. Our method replaces the hundreds of shadow rays commonly used in stochastic ray tracers with a single shadow ray and a local reconstruction of the visibility function. Compared to tracing the shadow rays, our algorithm produces exactly the same image while executing one to two orders of magnitude faster in the test scenes used. Our first contribution is a two-stage method for quickly determining the silhouette edges that overlap an area light source, as seen from the point to be shaded. Secondly, we show that these partial silhouettes of occluders, along with a single shadow ray, are sufficient for reconstructing the visibility... (More)
- We present a new, fast algorithm for rendering physically-based soft shadows in ray tracing-based renderers. Our method replaces the hundreds of shadow rays commonly used in stochastic ray tracers with a single shadow ray and a local reconstruction of the visibility function. Compared to tracing the shadow rays, our algorithm produces exactly the same image while executing one to two orders of magnitude faster in the test scenes used. Our first contribution is a two-stage method for quickly determining the silhouette edges that overlap an area light source, as seen from the point to be shaded. Secondly, we show that these partial silhouettes of occluders, along with a single shadow ray, are sufficient for reconstructing the visibility function between the point and the light source. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/229447
- author
- Laine, S ; Aila, T ; Assarsson, U ; Lehtinen, J and Akenine-Möller, Tomas LU
- organization
- publishing date
- 2005
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- shadow algorithms, visibility determination
- in
- ACM Transactions on Graphics
- volume
- 24
- issue
- 3
- pages
- 1156 - 1165
- publisher
- Association for Computing Machinery (ACM)
- external identifiers
-
- wos:000231223700100
- scopus:33646041662
- ISSN
- 0730-0301
- DOI
- 10.1145/1073204.1073327
- language
- English
- LU publication?
- yes
- id
- 08c7713f-7d52-4b7c-8b0e-ec657bacbebe (old id 229447)
- date added to LUP
- 2016-04-01 16:40:51
- date last changed
- 2022-02-05 17:48:42
@article{08c7713f-7d52-4b7c-8b0e-ec657bacbebe,
abstract = {{We present a new, fast algorithm for rendering physically-based soft shadows in ray tracing-based renderers. Our method replaces the hundreds of shadow rays commonly used in stochastic ray tracers with a single shadow ray and a local reconstruction of the visibility function. Compared to tracing the shadow rays, our algorithm produces exactly the same image while executing one to two orders of magnitude faster in the test scenes used. Our first contribution is a two-stage method for quickly determining the silhouette edges that overlap an area light source, as seen from the point to be shaded. Secondly, we show that these partial silhouettes of occluders, along with a single shadow ray, are sufficient for reconstructing the visibility function between the point and the light source.}},
author = {{Laine, S and Aila, T and Assarsson, U and Lehtinen, J and Akenine-Möller, Tomas}},
issn = {{0730-0301}},
keywords = {{shadow algorithms; visibility determination}},
language = {{eng}},
number = {{3}},
pages = {{1156--1165}},
publisher = {{Association for Computing Machinery (ACM)}},
series = {{ACM Transactions on Graphics}},
title = {{Soft shadow volumes for ray tracing}},
url = {{http://dx.doi.org/10.1145/1073204.1073327}},
doi = {{10.1145/1073204.1073327}},
volume = {{24}},
year = {{2005}},
}