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Abstract

Line Integral Convolution (LIC) is a common approach for the visualization of vector fields. It is well suited for visualizing the direction of a flow field, but it gives no information about the orientation of the underlying vectors. We introduce Oriented Line Integral Convolution (OLIC), where direction as well as orientation are encoded within the resulting image. This is achieved by using a low frequency input texture and a ramp like (unisotropic) convolution kernel. This method can be animated, whereby the computation of so called pixel traces fastens the calculation process. In the result section various OLICs using simple and real-world vector fields are shown.

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@techreport{Wegenkittl-1996-AFR,
  title =      "Animating Flowfields: Rendering of Oriented Line
               Integral
		Convolution",
  author =     "Rainer Wegenkittl and Meister Eduard Gr{\"o}ller and Werner
               Purgathofer",
  year =       "1996",
  abstract =   "Line Integral Convolution (LIC) is a common approach for the
               visualization of vector fields. It is well suited for
               visualizing the direction of a flow field, but it gives no
               information about the orientation of the underlying vectors.
               We introduce Oriented Line Integral Convolution (OLIC),
               where direction as well as orientation are encoded within
               the resulting image. This is achieved by using a low
               frequency input texture and a ramp like (unisotropic)
               convolution kernel. This method can be animated, whereby the
               computation of so called pixel traces fastens the
               calculation process. In the result section various OLICs
               using simple and real-world vector fields are shown.",
  address =    "Favoritenstrasse 9-11/186, A-1040 Vienna, Austria",
  institution = "Institute of Computer Graphics and Algorithms, Vienna
               University of Technology",
  note =       "human contact: technical-report@cg.tuwien.ac.at",
  month =      dec,
  number =     "TR-186-2-96-23",
  keywords =   "flowfield visualization, line integral convolution",
  URL =        "http://www.cg.tuwien.ac.at/research/publications/1996/Wegenkittl-1996-AFR/",
}