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Issue No. 04 - July/August (2004 vol. 24)
ISSN: 0272-1716
pp: 64-72
Matthias Hopf , University of Stuttgart, Germany
Michael Luttenberger , University of Stuttgart, Germany
Thomas Ertl , University of Stuttgart, Germany
Visualizing large uncorrelated point data sets with regular volume rendering produces unsatisfying results due to low spatial resolution. For time-dependent data, available main memory can be a limiting factor as well. To deal with these large time-varying data sets, a hierarchical representation is created and quantized relative coordinates are stored. During rendering the compressed data is accessed out of core, and particle positions are interpolated using B-splines. Traversing the hierarchical structure for each frame can trade-off rendering speed for image quality, achieving interactive rates for data sets with millions of points.
volume rendering, scattered data, splatting, hierarchical visualization, time-dependent data, out-of-core techniques

M. Luttenberger, M. Hopf and T. Ertl, "Hierarchical Splatting of Scattered 4D Data," in IEEE Computer Graphics and Applications, vol. 24, no. , pp. 64-72, 2004.
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