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      • Department of Computer Engineering
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      Extraction of 3D navigation space in virtual urban environments

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      Author
      Yılmaz, Türker
      Güdükbay, Uğur
      Date
      2005-09
      Source Title
      13th European Signal Processing Conference, EUSIPCO 2005
      Publisher
      IEEE
      Pages
      105 - 108
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
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      Abstract
      Urban scenes are one class of complex geometrical environments in computer graphics. In order to develop navigation systems for urban sceneries, extraction and cellulization of navigation space is one of the most commonly used technique providing a suitable structure for visibility computations. Surprisingly, there is not much work done for the extraction of the navigable area automatically. Urban models, except for the ones where the building footprints are used to generate the model, generally lack navigation space information. Because of this, it is hard to extract and discretize the navigable area for complex urban scenery. In this paper, we propose an algorithm for the extraction of navigation space for urban scenes in threedimensions (3D). Our navigation space extraction algorithm works for scenes, where the buildings are in high complexity. The building models may have pillars or holes where seeing through them is also possible. Besides, for the urban data acquired from different sources which may contain errors, our approach provides a simple and efficient way of discretizing both navigable space and the model itself. The extracted space can instantly be used for visibility calculations such as occlusion culling in 3D space. Furthermore, terrain height field information can be extracted from the resultant structure, hence providing a way to implement urban navigation systems including terrains.
      Keywords
      3D navigation
      Cellulization
      Occlusion culling
      Urban visualization
      View-cells
      3-D space
      3D navigation
      Building footprint
      Building model
      Cellulization
      Occlusion culling
      Space extraction
      Terrain height
      Urban environments
      Urban model
      Urban scenes
      View-cells
      Visibility calculation
      Visibility computation
      Algorithms
      Navigation systems
      Signal processing
      Three dimensional
      Visibility
      Visualization
      Three dimensional computer graphics
      Permalink
      http://hdl.handle.net/11693/27348
      Published Version (Please cite this version)
      https://ieeexplore.ieee.org/document/7077894
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      • Department of Computer Engineering 1368
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