A Fast Algorithm for Shadow Generation with Low Distortion Based on  Shadow Map Technique

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Zare, Ehsan | 2013

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 44372 (19)
University: Sharif University of Technology
Department: Computer Engineering
Advisor(s): Jamzad, Mansour
Abstract:
Shadows are one of the most important details in graphical images. There exist many shadow generation algorithms each of which suffers from some problems. High processing time and ill-shaped shadow borders, known as alasing, are some of such problems. In this paper, we propose a heuristic method based on standard shadow map technique, named rotated shadow maps, to generate excellent hard shadows. Our method uses some shadow maps which are generated from the same view but objects are slightly rotated around the center of view area. Rotated shadow maps can be considered as an independent hard shadow generation algorithm. Also it can be combined with other shadow map based approaches. Utilizing some shadow maps, we show how to draw shadows more reasonably while detecting shadow borders as ribbons of pixels. Our method maps well to graphics hardware and is easy to implement
Keywords:
Computer Graphics ; Shadow Generation ; Shadow Map ; Hard Shadow

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