A Multidirectional Occlusion Shading Model for Direct Volume Rendering

Veronika Šoltészová, Daniel Patel, Stefan Bruckner, Ivan Viola

ARTICLE, Computer Graphics Forum, june, 2010

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Abstract

In this paper, we present a novel technique which simulates directional light-scattering for more realistic interactive visualization of volume data. Our method extends the recent directional occlusion shading model by enabling light-source positioning with practically no performance penalty. Light transport is approximated using a tilted cone-shaped function which leaves elliptic footprints in the opacity buffer during slice-based volume rendering. We perform an incremental blurring operation on the opacity buffer for each slice in front-to-back order. This buffer is then used to define the degree of occlusion for the subsequent slice. Our method is capable of generating high-quality soft shadowing effects, allows interactive modification of all illumination and rendering parameters, and requires no pre-computation.

Published

Computer Graphics Forum

• Volume: 29
• Number: 3
• Pages: 883–891
• Event: EuroVis 2010
• Location: Bordeaux, France
• Date: june 2010
• Project: IllustraSound, MedViz, Illustrative Visualization
• URL: http://dx.doi.org/10.1111/j.1467-8659.2009.01695.x

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BibTeX

@article{solteszova10multidirectional,
  author = {Veronika \v{S}olt{\'e}szov{\'a} and Daniel Patel and Stefan Bruckner and Ivan Viola},
  title = {A Multidirectional Occlusion Shading Model for Direct Volume Rendering},
  year = {2010},
  month = {june},
  abstract = {In this paper, we present a novel technique which simulates 
directional light-scattering for more realistic interactive visualization 
of volume data. Our method extends the recent directional occlusion shading 
model by enabling light-source positioning with practically no performance 
penalty. Light transport is approximated using a tilted cone-shaped function
which leaves elliptic footprints in the opacity buffer during slice-based 
volume rendering. We perform an incremental blurring operation on the 
opacity buffer for each slice in front-to-back order. This buffer is then used 
to define the degree of occlusion for the subsequent slice. Our method is 
capable of generating high-quality soft shadowing effects, allows interactive 
modification of all illumination and rendering parameters, and requires no 
pre-computation.},
  journal = {Computer Graphics Forum},
  event = "EuroVis 2010",
  volume = {29},
  number = {3},
  pages = {883--891},
  location = "Bordeaux, France",



  URL = {http://dx.doi.org/10.1111/j.1467-8659.2009.01695.x}

}