Soft Shadow Art

Min, Sehee; Lee, Jaedong; Won, Jungdam; Lee, Jehee

Soft Shadow Art

Files

a03-C16-min.pdf (10.82 MB)

title.mp4 (84.87 MB)

Date

2017

Authors

Min, Sehee
Lee, Jaedong
Won, Jungdam
Lee, Jehee

Publisher

Association for Computing Machinery, Inc (ACM)

Abstract

Shadow art is a form of sculptural art in which the con guration of lights and sculptures cast 2D shadows for artistic e ect. Previous computational methods for the creation of shadow art assumes a single point light that casts a bitonal shadow with sharp boundary. e goal of our study is to generate grayscale shadows using an area light (or an array of point lights) and multiple layers of occluder cells. e area light source casts so shadows consisting of penumbra and umbra. e penumbra is the region in which only a portion of the light source is obscured by the occluders and the umbra is the region where the light sources are completely blocked by the occluders. Th e key challenge is to nd the arrangement of the occluders such that each pixel in the shadow region gathers light from the partially occluded light source to yield a desired tone level. e problem can be formulated as combinatorial optimization with many binary variables. We present a stochastic algorithm that converges quickly to the target shadow image. Our algorithm generalizes easily to deal with arbitrary lighting and geometry setups. We demonstrate the potential of our system with a number of tonal images and the fabrication of artistic ornaments that cast grayscale shadows.

        @inproceedings{10.1145:3092912.3092915
,
booktitle = {Computational Aesthetics
},
editor = {Holger Winnemoeller and Lyn Bartram
},
title = {{Soft Shadow Art
}},
author = {Min, Sehee and 
Lee, Jaedong and 
Won, Jungdam and 
Lee, Jehee
},
year = {2017
},
publisher = {Association for Computing Machinery, Inc (ACM)
},
ISSN = {1816-0859
},
ISBN = {978-1-4503-5080-8
},
DOI = {10.1145/3092912.3092915
}
}