Reference TypeConference Proceedings
Citation KeyFariasScheCombVelh:2005:BoOpSu
Author1 Farias, Marcus A. C.
2 Scheidegger, Carlos E.
3 Comba, João L. D.
4 Velho, Luiz C.
Affiliation1 Instituto de Informática, UFRGS
2 Scientific Computing and Imaging Institute, University of Utah
3 Instituto de Matem´atica Pura e Aplicada
TitleBoolean operations on surfel-bounded objects using constrained BSP-trees
Conference NameBrazilian Symposium on Computer Graphics and Image Processing, 18 (SIBGRAPI)
EditorRodrigues, Maria Andréia Formico
Frery, Alejandro César
Book TitleProceedings
Date9-12 Oct. 2005
Publisher CityLos Alamitos
PublisherIEEE Computer Society
Conference LocationNatal
KeywordsBSP-trees, Boolean operations, operações Booleanas, surfel.
AbstractPoint-based modeling and rendering is an active area of research in Computer Graphics. The concept of points with attributes (e.g. normals) is usually referred to as surfels, and many algorithms have been devised to their efficient manipulation and rendering. Key to the efficiency of many methods is the use of partitioning schemes, and usually axis-aligned structures such as octrees and KD-trees are preferred, instead of more general BSP-trees. In this work we introduce a data structure called Constrained BSPtree (CBSP-tree) that can be seen as an intermediate structure between KD-trees and BSP-trees. The CBSP-tree is characterized by allowing arbitrary cuts as long as the complexity of its cells remains bounded, allowing better approximation of curved regions. We discuss algorithms to build CBSP-trees using the flexibility that the structure offers, and present a modified algorithm for boolean operations that uses a new inside-outside object classification. Results show that CBSP-trees generate fewer cells than axisaligned structures.
Tertiary TypeFull Paper
Size531 KiB
Number of Files1
Target Filefariasm_constrained_bsp.pdf
Last Update2005: administrator
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