Welcome on the homepage of the chair "Computer Graphics Systems" of Prof. Jürgen Döllner and his team. We like to inform you about our teaching and ongoing research activities in the analysis, planning and construction of computer graphics and multimedia systems.
Matthias Trapp currently works as a post-doctoral researcher, lecturer, and head of the research group '4DnD-Geovisualization' (InnoProfile Transfer Initiative) at HPI, Computergraphics Systems Chair. His research interests include the following topics:
GPU-based image and video processing techniques and frameworks
Interactive GPU-based rendering techniques for massive spatio-temporal data
Focus+context visualization techniques for 3D virtual environments
Trapp, Matthias; Döllner, Jürgen
Journal of WSCG
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.
Colonia3D – Potenziale interaktiver Kommunikation von digitaler Denkmalpflege in öffentlichen Räumen, Prometheus Conference 2011, University of Cologne, Cologne/Germany
Kommunikation von digitaler Denkmalpflege in öffentlichen Räumen am Beispiel des Projektes Colonia3D, Invited Talk at the Department of Photogrammetry & Laserscanning at the HCU (HafenCity University), Hamburg/ Germany
High-Level Vector Editing, Invited Talk at the Computer Science Department of the Courant Institute of Mathematical Sciences at New York University, New York/USA, 2010