Title:
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Visualization of large-scale urban models through multi-level relief impostors
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Author:
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Andújar Gran, Carlos Antonio; Brunet Crosa, Pere; Chica Calaf, Antonio; Navazo Álvaro, Isabel
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Llenguatges i Sistemes Informàtics; Universitat Politècnica de Catalunya. MOVING - Grup de Recerca en Modelatge, Interacció i Visualització en Realitat Virtual |
Abstract:
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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 approaches while producing images with higher quality than competing relief-mapping techniques. We show both analytically and empirically that multi-level relief impostors are suitable for interactive navigation through large urban models. |
Subject(s):
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-Àrees temàtiques de la UPC::Informàtica::Infografia -Rendering (Computer graphics) -Three dimensional imaging -Urban rendering -Relief mapping -Large city visualization -Infografia tridimensional |
Rights:
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Document type:
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Article - Published version Article |
Published by:
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North Holland
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