Title:	Coherence in scan-line algorithms for CSG
Authors:	Gröller, Eduard Brunner, Peter
Citation:	Journal of WSCG. 1994, vol. 2, no. 1-2, p. 55-65.
Issue Date:	1994
Publisher:	Václav Skala - UNION Agency
Document type:	článek article
URI:	http://wscg.zcu.cz/wscg1994/wscg94.htm http://hdl.handle.net/11025/16065
ISSN:	1213-6972 (print) 1213-6980 (CD-ROM) 1213-6964 (online)
Keywords:	CSG;kvadriky;čtecí linka algoritmu;rozšířený BRep;zaoblené hrany
Keywords in different language:	CSG;quadrics;scan line algorithm;extended BRep;curved edges
Abstract in different language:	Scan-line algorithms for visibility calculation exploit various types of coherence properties. Several scan-line algorithms for Constructive Solid Geometry (CSG) are discussed. In one approach CSG primitives are represented by polygonal approximations. Another technique processes CSG primitives as general quadric surfaces. We investigate the handling of frequently occuring quadric surfaces (cube, cone, sphere, cylinder)as distinct cases. Thus the differing properties of such objects can be used more efficiently than a uniform approach would allow. A so called eBRep (extended Boundary Representation) is defined for the frequently occuring quadric surfaces. An eBRep is an exact representation of a quadric object and contains curved edges and faces. For each of the above mentioned quadric surfaces a different, geometry dependent eBRep is specified. A comparison between the polygon-based scan-line algorithm for CSG and our eBRep based approach is done. eBRep is a storage efficient exact representation of quadric surfaces, well suited for scan-line visibility determination.
Rights:	© Václav Skala - UNION Agency
Appears in Collections:	Volume 2, number 1-2 (1994)

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