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    • 38-Issue 4
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    Ray Classification for Accelerated BVH Traversal

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    Date
    2019
    Author
    Hendrich, Jakub
    Pospíšil, Adam
    Meister, Daniel ORCID
    Bittner, Jiří
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    Abstract
    For ray tracing based methods, traversing a hierarchical acceleration data structure takes up a substantial portion of the total rendering time. We propose an additional data structure which cuts off large parts of the hierarchical traversal. We use the idea of ray classification combined with the hierarchical scene representation provided by a bounding volume hierarchy. We precompute short arrays of indices to subtrees inside the hierarchy and use them to initiate the traversal for a given ray class. This arrangement is compact enough to be cache-friendly, preventing the method from negating its traversal gains by excessive memory traffic. The method is easy to use with existing renderers which we demonstrate by integrating it to the PBRT renderer. The proposed technique reduces the number of traversal steps by 42% on average, saving around 15% of time of finding ray-scene intersection on average.
    BibTeX
    @article {10.1111:cgf.13769,
    journal = {Computer Graphics Forum},
    title = {{Ray Classification for Accelerated BVH Traversal}},
    author = {Hendrich, Jakub and Pospíšil, Adam and Meister, Daniel and Bittner, Jiří},
    year = {2019},
    publisher = {The Eurographics Association and John Wiley & Sons Ltd.},
    ISSN = {1467-8659},
    DOI = {10.1111/cgf.13769}
    }
    URI
    https://doi.org/10.1111/cgf.13769
    https://diglib.eg.org:443/handle/10.1111/cgf13769
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