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    Accelerating Volume Raycasting using Occlusion Frustums

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    147-154.pdf (452.1Kb)
    Date
    2008
    Author
    Mensmann, Jörg
    Ropinski, Timo ORCID
    Hinrichs, Klaus
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    Abstract
    GPU-based volume raycasting allows to produce high quality renderings on current graphics hardware. The use of such raycasters is on the rise due to their inherent flexibility as well as the advances in hardware performance and functionality. Although recent raycasting systems achieve interactive frame rates on high-end graphics hardware, further improved performance would enable more complex rendering techniques, e. g., advanced illumination models. In this paper we introduce a novel approach to empty space leaping in order to reduce the number of costly volume texture fetches during ray traversal. We generate an optimized proxy geometry for raycasting which is based on occlusion frustums obtained from previous frames. Our technique does not rely on any preprocessing, introduces no image artifacts, and in contrast to previous point-based methods works also for non-continuous view changes. Besides the technical realization and the performance results, we also discuss the potential problems of ray coherence in relation to our approach and restrictions in current GPU architectures. The presented technique has been implemented using fragment and geometry shaders and can be integrated easily into existing raycasting systems.
    BibTeX
    @inproceedings {10.2312:VG:VG-PBG08:147-154,
    booktitle = {IEEE/ EG Symposium on Volume and Point-Based Graphics},
    editor = {Hans-Christian Hege and David Laidlaw and Renato Pajarola and Oliver Staadt},
    title = {{Accelerating Volume Raycasting using Occlusion Frustums}},
    author = {Mensmann, Jörg and Ropinski, Timo and Hinrichs, Klaus},
    year = {2008},
    publisher = {The Eurographics Association},
    ISSN = {1727-8376},
    ISBN = {978-3-905674-12-5},
    DOI = {10.2312/VG/VG-PBG08/147-154}
    }
    URI
    http://dx.doi.org/10.2312/VG/VG-PBG08/147-154
    Collections
    • VG-PBG08: Eurographics/IEEE VGTC on Volume and Point-Based Graphics
    • VG-PBG08: Eurographics/IEEE VGTC on Volume and Point-Based Graphics

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    Eurographics Association copyright © 2013 - 2023 
    Send Feedback | Contact - Imprint | Data Privacy Policy | Disable Google Analytics
    Theme by @mire NV
    System hosted at  Graz University of Technology.
    TUGFhA