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    Ambient Occlusion Effects for Combined Volumes and Tubular Geometry

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    Type
    Article
    Authors
    Schott, M.
    Martin, T.
    Grosset, A. V. P.
    Smith, S. T.
    Hansen, C. D.
    Date
    2013-06
    Permanent link to this record
    http://hdl.handle.net/10754/597495
    
    Metadata
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    Abstract
    This paper details a method for interactive direct volume rendering that computes ambient occlusion effects for visualizations that combine both volumetric and geometric primitives, specifically tube-shaped geometric objects representing streamlines, magnetic field lines or DTI fiber tracts. The algorithm extends the recently presented the directional occlusion shading model to allow the rendering of those geometric shapes in combination with a context providing 3D volume, considering mutual occlusion between structures represented by a volume or geometry. Stream tube geometries are computed using an effective spline-based interpolation and approximation scheme that avoids self-intersection and maintains coherent orientation of the stream tube segments to avoid surface deforming twists. Furthermore, strategies to reduce the geometric and specular aliasing of the stream tubes are discussed.
    Citation
    Schott M, Martin T, Grosset AVP, Smith ST, Hansen CD (2013) Ambient Occlusion Effects for Combined Volumes and Tubular Geometry. IEEE Transactions on Visualization and Computer Graphics 19: 913–926. Available: http://dx.doi.org/10.1109/TVCG.2012.306.
    Sponsors
    This research was sponsored by the National Nuclear Security Administration under the Advanced Simulation and Computing program through US Department of Energy (DOE) Cooperative Agreement #DE-NA0000740, and by Award No. KUS-C1-016-04, made by King Abdullah University of Science and Technology (KAUST), and DOE SciDAC-2:SDAV, US National Science Foundation (NSF) OCI-0906379.
    Publisher
    Institute of Electrical and Electronics Engineers (IEEE)
    Journal
    IEEE Transactions on Visualization and Computer Graphics
    DOI
    10.1109/TVCG.2012.306
    PubMed ID
    23559506
    PubMed Central ID
    PMC3987773
    ae974a485f413a2113503eed53cd6c53
    10.1109/TVCG.2012.306
    Scopus Count
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