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Abstract

In volume rendering shadows provide an important visual cue, and enhance depth perception. However, shadowing has its own disadvantages. Shadows do not take into account the importance of features and could potentially result in too dark scenes. In this paper we propose an approach for inconsistent shadowing, which is designed to overcome these limitations. For the purpose of illustrative rendering, we propose two complementary techniques: 1. shadow caster inconsistency and 2. shadow receiver inconsistency. We demonstrate several advantages of the different approaches, using inconsistent shadowing. We present two approaches, based on shadow transfer function concept, an approach, introducing usage of gradient magnitude information in shadowing, and a method for adaptive shading and shadowing of the surface, depending on the gradient certainty.

Additional Files and Images

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video video: Framework Demonstration

BibTeX

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@techreport{sikachev_peter-2011-metavis,
  title =      "Interactive Algorithm Exploration using Meta Visualization",
  author =     "Peter Sikachev and Artem Amirkhanov and Robert S. Laramee
               and Gabriel Mistelbauer",
  year =       "2011",
  abstract =   "In volume rendering shadows provide an important visual cue,
               and enhance depth perception. However, shadowing has its own
               disadvantages. Shadows do not take into account the
               importance of features and could potentially result in too
               dark scenes. In this paper we propose an approach for
               inconsistent shadowing, which is designed to overcome these
               limitations. For the purpose of illustrative rendering, we
               propose two complementary techniques: 1. shadow caster
               inconsistency and 2. shadow receiver inconsistency. We
               demonstrate several advantages of the different approaches,
               using inconsistent shadowing. We present two approaches,
               based on shadow transfer function concept, an approach,
               introducing usage of gradient magnitude information in
               shadowing, and a method for adaptive shading and shadowing
               of the surface, depending on the gradient certainty.",
  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",
  URL =        "http://www.cg.tuwien.ac.at/research/publications/2011/sikachev_peter-2011-metavis/",
}