NDLI: An object-oriented shadow generation algorithm for real-time application

Content Provider	IEEE Xplore Digital Library
Author	Wang, T. Sheu, P.C.-Y. Soochan Hwang
Copyright Year	1997
Description	Author affiliation: Dept. of Electr. & Comput. Eng., California Univ., Irvine, CA, USA (Wang, T.)
Abstract	Presents a fast shadow generation algorithm for a large number of convex polyhedra (objects) in a 3D scene based on the concept of characteristic views (CVs). The concept of CVs is that the infinite possible views of a 3D polyhedron can be grouped into a finite number of classes which have the same visible polygons from some reference points (i.e. viewpoints or point light sources). The space can be partitioned into subspaces in which all reference points have the same object ordering. Basically, object-precision hidden surface removal algorithms and object-precision shadow generation algorithms are the same except for the reference point. The shadow volume binary space partitioning (SVBSP) tree algorithm is known to be efficient in a static environment in which the point light source can be changed. However, if a scene consists of many objects and each object consists of many polygons, the time complexity for generating and traversing the SVBSP tree increases rapidly because the SVBSP tree algorithm deals with polygons which are components of objects. Furthermore, the SYBSP tree algorithm suffers from polygon-splitting problems resulting in a high cost as the number of polygons increases. Our approach is object-oriented in the sense that an object is used as the basic unit and polygons can be considered as components of the associated object. For all light source positions, the object ordering for shadow generation is determined at the preprocessing stage. At run-time, the shadow detection algorithm is executed and, if necessary, shadow fragments are generated.
Starting Page	17
Ending Page	24
File Size	743463
Page Count	8
File Format	PDF
ISBN	0818680466
DOI	10.1109/WORDS.1997.609920
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-06-05
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Light sources Partitioning algorithms Application software Character generation Layout Computer graphics Data structures Costs Detection algorithms Change detection algorithms
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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