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Soft shadows using sp-line approximation

Kolivand, H and Sunar, MS (2015) Soft shadows using sp-line approximation. Jurnal Teknologi, 75 (2). pp. 63-69. ISSN 0127-9696

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© 2015 Penerbit UTM Press. All rights reserved. Realistic soft shadows are an important factor to enhance the realism of Augmented Reality systems. Without shadows, virtual objects would look floating over the scene resulting unrealistic rendering of AR environment. Little attention has been directed towards balanced trade-off between shadow quality and computational cost. In this study, a new approach is proposed; Quadratic Sp-line Interpolation (QSI) to soften the outline of the shadow. QSI estimates the border of hard shadow samples. In more details, a reflective hemisphere is used to capture real light then to create an environment map. Implementation of the Median Cut algorithm is performed to locate the direction of real light sources on the environment map. Subsequently, the original hard shadows are retrieved and a sample of multilayer hard shadows is produced. The proposed technique is tested by using three samples of multilayer hard shadows with a varied number of light sources that are generated from the Median Cut algorithm. The experimental results show that the proposed technique has successfully produced realistic soft shadows with low computational costs.

Item Type: Article
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Divisions: Computer Science & Mathematics
Publisher: Penerbit Universiti Teknologi Malaysia Press
Date Deposited: 20 Feb 2018 11:33
Last Modified: 04 Sep 2021 03:09
DOI or ID number: 10.11113/jt.v75.4979
URI: https://researchonline.ljmu.ac.uk/id/eprint/8071
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