@article{Karpenko:2006:S3F,
  optpostscript = {},
  number = {3},
  month = jul,
  author = {Olga A. Karpenko and John F. Hughes},
  optkey = {},
  optannote = {},
  localfile = {papers/Karpenko.2006.S3F.pdf},
  optkeywords = {},
  doi = {http://doi.acm.org/10.1145/1141911.1141928},
  optciteseer = {},
  journal = SIGGRAPH2006,
  opturl = {},
  volume = {25},
  optwww = {},
  title = {{SmoothSketch}: {3D} {F}ree-{F}orm {S}hapes from {C}omplex
           {S}ketches},
  abstract = {We introduce SmoothSketch---a system for inferring plausible 3D
              free-form shapes from visible-contour sketches. In our system, a
              user's sketch need not be a simple closed curve as in Igarashi's
              Teddy [1999], but may have cusps and T-junctions, i.e., endpoints
              of hidden parts of the contour. We follow a process suggested by
              Williams [1994] for inferring a smooth solid shape from its
              visible contours: completion of hidden contours, topological shape
              reconstruction, and smoothly embedding the shape via relaxation.
              Our main contribution is a practical method to go from a contour
              drawing to a fairly smooth surface with that drawing as its
              visible contour. In doing so, we make several technical
              contributions: extending Williams' and Mumford's work [Mumford
              1994] on figural completion of hidden contours containing
              T-junctions to contours containing cusps as well, characterizing a
              class of visible-contour drawings for which inflation can be
              proved possible, finding a topological embedding of the
              combinatorial surface that Williams creates from the figural
              completion, and creating a fairly smooth solid shape by smoothing
              the topological embedding using a mass-spring system.We handle
              many kinds of drawings (including objects with holes), and the
              generated shapes are plausible interpretations of the sketches.
              The method can be incorporated into any sketch-based free-form
              modeling interface like Teddy.},
  pages = {589--598},
  year = {2006},
}