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      • Department of Computer Engineering
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      Conservative occlusion culling for urban visualization using a slice-wise data structure

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      Author
      Yılmaz, T.
      Güdükbay, Uğur
      Date
      2007
      Source Title
      Graphical Models
      Print ISSN
      1524-0703
      Publisher
      Academic Press
      Volume
      69
      Issue
      3-4
      Pages
      191 - 210
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      In this paper, we propose a framework for urban visualization using a conservative from-region visibility algorithm based on occluder shrinking. The visible geometry in a typical urban walkthrough mainly consists of partially visible buildings. Occlusion-culling algorithms, in which the granularity is buildings, process these partially visible buildings as if they are completely visible. To address the problem of partial visibility, we propose a data structure, called slice-wise data structure, that represents buildings in terms of slices parallel to the coordinate axes. We observe that the visible parts of the objects usually have simple shapes. This observation establishes the base for occlusion-culling where the occlusion granularity is individual slices. The proposed slice-wise data structure has minimal storage requirements. We also propose to shrink general 3D occluders in a scene to find volumetric occlusion. Empirical results show that significant increase in frame rates and decrease in the number of processed polygons can be achieved using the proposed slice-wise occlusion-culling as compared to an occlusion-culling method where the granularity is individual buildings. © 2007 Elsevier Inc. All rights reserved.
      Keywords
      Space subdivision
      Octree
      Occlusion-culling
      Occluder shrinking
      Minkowski difference
      From-region visibility
      Urban visualization
      Permalink
      http://hdl.handle.net/11693/23472
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.gmod.2007.01.002
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