Istituto di Scienza e Tecnologie dell'Informazione     
Di Benedetto M., Cignoni P., Ganovelli F., Gobbetti E., Marton F., Scopigno R. Interactive remote exploration of massive cityscapes. In: VAST 2009 - The 10th International Symposium on Virtual Reality, Archaeology and Cultural Heritage (MALTA, 22-25 Settembre 2009). Proceedings, pp. 9 - 16. C. Perlingieri, D. Pitzalis, 2009.
We focus on developing a simple and efficient unified level-of-detail structure for networked urban model viewers. At the core of our approach is a revisitation of the BlockMap [CBG∗ 07] data structure, originally introduced for encoding coarse representations of blocks of buildings to be used as direction-independent impostors when ren- dering far-away city blocks. The contribution of this paper is manifold: we extend the BlockMap representation to support sloped surfaces and input-sensitive sampling of color; we introduce a novel sampling strategy for building accurate BlockMaps; we show that BlockMaps can be used as a versatile and robust way to parameterize the visi- ble surface of a highly complex model; we improve the expressiveness of urban models rendering by integrating an ambient occlusion term in the representation and describe an efficient method for computing it; we illustrate the design and implementation of a urban models streaming and visualization system and demonstrate its efficiency when browsing large city models in a limited bandwidth setting
Subject 3D Graphics
Real time visualization
I.3 Computer Graphics

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