Visualization of Large-Scale Urban Models through Multi-Level Relief Impostors

In this paper, we present an efficient approach for the interactive rendering of large-scale urban models, which can be integrated seamlessly with virtual globe applications. Our scheme fills the gap between standard approaches for distant views of digital terrains and the polygonal models required for close-up views. Our work is oriented towards city models with real photographic textures of the building facades. At the heart of our approach is a multi-resolution tree of the scene defining multi-level relief impostors. Key ingredients of our approach include the pre-computation of a small set of zenithal and oblique relief maps that capture the geometry and appearance of the buildings inside each node, a rendering algorithm combining relief mapping with projective texture mapping which uses only a small subset of the pre-computed relief maps, and the use of wavelet compression to simulate two additional levels of the tree. Our scheme runs considerably faster than polygonal-based appr...

• Type: Journal
• Year: 2010
• Where: CGF
• Authors: Carlos Andújar, Pere Brunet, Antoni Chica, Isabel Navazo
• Keywords: CGF 2010, Computational Geometry, Multi-level Relief Impostors, Relief Maps, Urban Models