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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

Additional files:
video1 video1: 1D Shadow Transfer Function Demonstration
video2 video2: Contour-preserving Shadow Rendering Demonstration

BibTeX

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@techreport{sikachev_peter-2011-incshad,
  title =      "Inconsistent Shadows for Volume Rendering",
  author =     "Peter Sikachev and Peter Rautek and Stefan Bruckner and
               Meister Eduard Gr{\"o}ller",
  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-incshad/",
}