@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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