3d generalization lenses for interactive focus + context…：交互式焦点+上下文的三维综合镜头….pdf

3D Generalization Lenses for Interactive Focus + Context Visualization of Virtual City Models Matthias Trapp, Tassilo Glander, Henrik Buchholz, J ¨urgen D ¨ ollner Hasso-Plattner-Institute (University of Potsdam) {, , , doellner } ***@- Abstract Focus + context visualization facilitates the exploration plex information spaces. This paper proposes 3D generalization lenses, a new visualization technique for vir- tual 3D city models bines different levels of struc- tural abstraction. In an automatic preprocessing step, we derive a generalized representation of a given city model. At runtime, this representation bined with a full-detail representation within a single view based on one or more 3D lenses of arbitrary shape. Focus areas within lens vol- umes are shown in full detail while excluding less important details of the surrounding area. Our technique supports simultaneous use of multiple lenses associated with differ- ent abstraction levels, can handle overlapping and nested lenses, and provides interactive lens modi?cation. 1 Introduction Today’s large-scale virtual 3D city models are character- ized by a large number of objects of different types, mani- fold structures and hierarchies among them, and a high de- gree of visual detail [4]. Thus, they transport a huge amount of different information, ., encoded in f