Shadow Penumbras for Complex Objects by Depth-Dependent Filtering of Multi-Layer Depth Images

Keating, Brett; Max, Nelson

Shadow Penumbras for Complex Objects by Depth-Dependent Filtering of Multi-Layer Depth Images

Files

197-212.pdf (174.75 KB)

Date

1999

Authors

Keating, Brett
Max, Nelson

Publisher

The Eurographics Association

Abstract

This paper presents an efficient algorithm for filtering multi-layer depth images (MDIs) in order to produce approximate penumbras. The filtering is performed on a MDI that represents the view from the light source. The algorithm is based upon both ray tracing and the z-buffer shadow algorithm, and is closely related to convolution methods. The method s effectiveness is demonstrated on especially complex objects such as trees, whose soft shadows are expensive to compute by other methods. The method specifically addresses the problem of light-leaking that occurs when tracing rays through discrete representations, and the inability of convolution methods to produce accurate self-shadowing effects.

        @inproceedings{:10.2312/EGWR/EGWR99/197-212
,
booktitle = {Eurographics Workshop on Rendering
},
editor = {Dani Lischinski and Greg Ward Larson
},
title = {{Shadow Penumbras for Complex Objects by Depth-Dependent Filtering of Multi-Layer Depth Images
}},
author = {Keating, Brett and 
Max, Nelson
},
year = {1999
},
publisher = {The Eurographics Association
},
ISSN = {1727-3463
},
ISBN = {3-211-83382-X
},
DOI = {/10.2312/EGWR/EGWR99/197-212
}
}