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Integrating occlusion culling and levels of detail through hardly-visible sets

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10.1111/1467-8659.00442
 
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hdl:2117/10862

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Andújar Gran, Carlos AntonioMés informacióMés informacióMés informació
Saona Vázquez, Carlos Luis
Navazo Álvaro, IsabelMés informacióMés informació
Brunet Crosa, PereMés informacióMés informació
Document typeArticle
Defense date2000-12
PublisherNorth Holland
Rights accessRestricted access - publisher's policy
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
Abstract
Occlusion culling and level-of-detail rendering have become two powerful tools for accelerating the handling of very large models in real-time visualization applications. We present a framework that combines both techniques to improve rendering times. Classical occlusion culling algorithms compute potentially visible sets (PVS), which are supersets of the sets of visible polygons. The novelty of our approach is to estimate the degree of visibility of each object of the PVS using synthesized coarse occluders. This allows to arrange the objects of each PVS into several Hardly-Visible Sets (HVS) with similar occlusion degree. According to image accuracy and frame rate requirements, HVS provide a way to avoid sending to the graphics pipeline those objects whose pixel contribution is low due to partial occlusion. The image error can be bounded by the user at navigation time. On the other hand, as HVS offer a tighter estimation of the pixel contribution for each scene object, it can be used for a more convenient selection of the level-of-detail at which objects are rendered. In this paper, we describe the new framework technique, provide details of its implementation using a visibility octree as the chosen occlusion culling data structure and show some experimental results on the image quality.
CitationAndujar, C. [et al.]. Integrating occlusion culling and levels of detail through hardly-visible sets. "Computer graphics forum", Desembre 2000, vol. 19, núm. 3, p. 499-506. 
URIhttp://hdl.handle.net/2117/10862
DOI10.1111/1467-8659.00442
ISSN0167-7055
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  • Departament de Ciències de la Computació - Articles de revista [996]
  • MOVING - Grup de Recerca en Modelatge, Interacció i Visualització en Realitat Virtual - Articles de revista [68]
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