Title: 2.5D Clip-Surfaces for Technical Visualization
Authors: Trapp, Matthias
Döllner, Jürgen
Citation: Journal of WSCG. 2013, vol. 21, no. 1, p. 89-96.
Issue Date: 2013
Publisher: Václav Skala - Union Agency
Document type: article
článek
URI: http://wscg.zcu.cz/WSCG2013/!_2013_J_WSCG-1.pdf
http://hdl.handle.net/11025/6874
ISSN: 1213–6972 (hardcopy)
1213-6980 (CD-ROM)
1213–6964 (on-line)
Keywords: technická vizualizace;3D vizualizace;real-time vykreslování;ořezové roviny
Keywords in different language: technical visualization;3D visualization;real-time rendering;clipping planes
Abstract: The concept of clipping planes is well known in computer graphics and can be used to create cut-away views. But clipping against just analytical defined planes is not always suitable for communicating every aspect of such visualization. For example, in hand-drawn technical illustrations, artists tend to communicate the difference between a cut and a model feature by using non-regular, sketchy cut lines instead of straight ones. To enable this functionality in computer graphics, this paper presents a technique for applying 2.5D clip-surfaces in real-time. Therefore, the clip plane equation is extended with an additional offset map, which can be represented by a texture map that contains height values. Clipping is then performed by varying the clip plane equation with respect to such an offset map. Further, a capping technique is proposed that enables the rendering of caps onto the clipped area to convey the impression of solid material. It avoids a re-meshing of a solid polygonal mesh after clipping is performed. Our approach is pixel precise, applicable in real-time, and takes fully advantage of graphics accelerators.
Rights: © Václav Skala - UNION Agency
Appears in Collections:Volume 21, Number 1 (2013)

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