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[AVM+05]  Silhouette Detection in Volumetric Models Based on a Non-Photorealistic Illumination System

Arroyo:2005:SDV (Article)
Author(s)Arroyo G., Velasco F. and Martín D.
Title« Silhouette Detection in Volumetric Models Based on a Non-Photorealistic Illumination System »
JournalComputers & Graphics
Volume29
Number2
Page(s)209--216
Year2005

Abstract
A basic step for many illustration techniques is the extraction of silhouettes and shape lines, in order to enhance the object shape visible to the observer. This paper presents a new and very fast method to obtain silhouettes and shape lines in non-photorealistic volume rendering processes, based on ray-tracing using an octree for optimization. This method consists of extracting contours based on image buffers acquired during the calculation of intersections in ray-tracing process with the model. These image buffers are then combined to produce silhouettes and shape lines from the model. A substantial improvement with regard to other silhouette extraction methods in volumes is that this method does not require the user to define thresholds; furthermore, it is not based on the z-buffer and thus does not depend on the precision of the latter. Neither the camera position nor the direction affect the performance of the algorithm. Finally, the algorithm detects silhouettes for objects which are inside other objects that are distinguished only by their hue.

BibTeX code
@article{Arroyo:2005:SDV,
  optpostscript = {},
  number = {2},
  month = apr,
  author = {Germ{\'a}n Arroyo and Francisco Velasco and Domingo Mart{\'i}n},
  optkey = {},
  optannote = {},
  localfile = {papers/Arroyo.2005.SDV.pdf},
  optkeywords = {},
  doi = {http://dx.doi.org/10.1016/j.cag.2004.12.006},
  optciteseer = {},
  journal = j-CAG,
  opturl = {},
  volume = {29},
  optwww = {},
  title = {{S}ilhouette {D}etection in {V}olumetric {M}odels {B}ased on a
           {N}on-{P}hotorealistic {I}llumination {S}ystem},
  abstract = {A basic step for many illustration techniques is the extraction of
              silhouettes and shape lines, in order to enhance the object shape
              visible to the observer. This paper presents a new and very fast
              method to obtain silhouettes and shape lines in non-photorealistic
              volume rendering processes, based on ray-tracing using an octree
              for optimization. This method consists of extracting contours
              based on image buffers acquired during the calculation of
              intersections in ray-tracing process with the model. These image
              buffers are then combined to produce silhouettes and shape lines
              from the model. A substantial improvement with regard to other
              silhouette extraction methods in volumes is that this method does
              not require the user to define thresholds; furthermore, it is not
              based on the z-buffer and thus does not depend on the precision of
              the latter. Neither the camera position nor the direction affect
              the performance of the algorithm. Finally, the algorithm detects
              silhouettes for objects which are inside other objects that are
              distinguished only by their hue.},
  pages = {209--216},
  year = {2005},
}

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