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      • Department of Computer Engineering
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      Walkthrough in complex environments at interactive rates using level-of-detail

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      Author(s)
      Selçuk, Alper
      Güdükbay, Uğur
      Özgüç, Bülent
      Date
      2002
      Source Title
      Turkish Journal of Electrical Engineering and Computer Sciences
      Print ISSN
      1300-0632
      Publisher
      TÜBİTAK
      Volume
      10
      Issue
      1
      Pages
      57 - 72
      Language
      English
      Type
      Article
      Item Usage Stats
      174
      views
      39
      downloads
      Abstract
      One of the biggest problems in computer graphics is displaying huge geometric models at interactive rates. A lot of work has been done to achieve the required frame-rates in architecture, simulation, computer-aided design and entertainment applications. In this paper, a system that enables walkthrough in complex environments using level-of-detail approximations is explained. The system uses hierarchical triangulated models as input. In the preprocessing phase, multiresolution models of objects are created using polygonal simplification techniques. During walkthrough, fast frustum culling based on bounding boxes is performed to eliminate branches of hierarchy that are not visible. An appropriate level for detail of objects is selected and displayed depending on the distance of the objects to the camera. For far nodes in the hierarchy, geometric data in lower levels is ignored and textured bounding boxes are displayed. The system achieves interactive frame rates for moderately complex models containing up to a million polygons.
      Keywords
      Frame rate
      Geometric simplification
      Level-of-detail
      Rendering
      Visibility culling
      Walkthrough
      Approximation theory
      Computational geometry
      Computer aided design
      Computer simulation
      Data structures
      Interactive computer systems
      Geometric models
      Interactive computer graphics
      Permalink
      http://hdl.handle.net/11693/24719
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      • Department of Computer Engineering 1561
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