@inproceedings{Plantinga:2003:CGE,
opteditor = {},
optpostscript = {},
optorganization = {},
author = {Simon Plantinga and Gert Vegter},
optkey = {},
optannote = {},
optseries = {},
address = {New York},
localfile = {papers/Plantinga.2003.CGE.pdf},
optisbn = {},
publisher = {ACM Press},
optkeywords = {},
doi = {http://doi.acm.org/10.1145/781606.781614},
optmonth = {},
optciteseer = {},
opturl = {},
optcrossref = {},
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booktitle = {Proceedings of the Eighth ACM Symposium on Solid Modeling and
Applications (SM 2003, Seattle, Washington, USA)},
optvolume = {},
optnumber = {},
abstract = {The contour generator is an important visibility feature of a
smooth object seen under parallel projection. It is the curve on
the surface which separates frontfacing regions from back facing
regions. The apparent contour is the projection of the contour
generator onto a plane perpendicular to the view direction. Both
curves play an important role in computer graphics. Our goal is to
obtain fast and robust algorithms that compute the contour
generator with a guarantee of topological correctness. To this
end, we first study the singularities of the contour generator and
the apparent contour, for generic views, and for generic
timedependent projections, e.g. when the surface is rotated or
deformed. The singularities indicate when components of the
contour generator merge or split as time evolves.We present an
algorithm to compute an initial contour generator, using a dynamic
step size. An interval test guarantees the topological
correctness. This initial contour generator can then be maintained
under a timedependent projection by examining its
singularities.},
title = {{C}ontour {G}enerators of {E}volving {I}mplicit {S}urfaces},
year = {2003},
pages = {2332},
}
