Real Time Volumetric Shadows using Polygonal Light Volumes

Date

2010

Authors

Billeter, Markus
Sintorn, Erik
Assarsson, Ulf

Publisher

The Eurographics Association

Abstract

This paper presents a more efficient way of computing single scattering effects in homogeneous participating media for real-time purposes than the currently popular ray-marching based algorithms. These effects include halos around light sources, volumetric shadows and crepuscular rays. By displacing the vertices of a base mesh with the depths from a standard shadow map, we construct a polygonal mesh that encloses the volume of space that is directly illuminated by a light source. Using this volume we can calculate the airlight contribution for each pixel by considering only points along the eye-ray where shadow-transitions occur. Unlike previous ray-marching methods, our method calculates the exact airlight contribution, with respect to the shadow map resolution, at real time frame rates.

        @inproceedings{:10.2312/EGGH/HPG10/039-045
,
booktitle = {High Performance Graphics
},
editor = {Michael Doggett and Samuli Laine and Warren Hunt
},
title = {{Real Time Volumetric Shadows using Polygonal Light Volumes
}},
author = {Billeter, Markus and 
Sintorn, Erik and 
Assarsson, Ulf
},
year = {2010
},
publisher = {The Eurographics Association
},
ISSN = {2079-8687
},
ISBN = {978-3-905674-26-2
},
DOI = {/10.2312/EGGH/HPG10/039-045
}
}

URI

https://doi.org/10.2312/EGGH/HPG10/039-045

Collections

High-Performance Graphics 2010

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