Prof. Dr. Jürgen Döllner


2.5D Clip-Surfaces for Technical Visualization

Trapp, Matthias and Döllner, Jürgen
Journal of WSCG, vol. 21(1):89-96 6 2013


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.


clipping planes, real-time rendering, technical 3D visualization

BibTeX file

author = { Trapp, Matthias and D\"ollner, J\"urgen },
title = { 2.5D Clip-Surfaces for Technical Visualization },
booktitle = { Proceedings of WSCG 2013: 21st International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision },
pages = { 89-96 },
year = { 2013 },
editor = { Václav Skala },
publisher = { Union Agency },
journal = { Journal of WSCG },
volume = { 21 },
number = { 1 }

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last change: Tue, 24 Sep 2013 12:22:25 +0200