@inproceedings{Petrovic:2000:SCA,
  author = {Lena Petrovic and Brian Fujito and Lance Williams and Adam
            Finkelstein},
  series = CGPACS,
  editor = {Kurt Akeley},
  localfile = {papers/Petrovic.2000.SCA.pdf },
  address = {New York},
  optkeywords = {Shadows, cel animation, inflation, sketching, NPR},
  publisher = {ACM Press},
  doi = {http://doi.acm.org/10.1145/344779.345073},
  organization = {ACM SIGGRAPH},
  citeseer = {http://citeseer.nj.nec.com/petrovic00shadows.html},
  booktitle = SIGGRAPH2000,
  optstatus = {OK},
  abstract = {We present a semi-automatic method for creating shadow mattes in
              cel animation. In conventional cel animation, shadows are drawn by
              hand, in order to provide visual cues about the spatial
              relationships and forms of characters in the scene. Our system
              creates shadow mattes based on hand-drawn characters, given
              high-level guidance from the user about depths of various objects.
              The method employs a scheme for inflating a 3D figure based on
              hand-drawn art. It provides simple tools for adjusting object
              depths, coupled with an intuitive interface by which the user
              specifies object shapes and relative positions in a scene. Our
              system obviates the tedium of drawing shadow mattes by hand, and
              provides control over complex shadows falling over interesting
              shapes.},
  title = {{S}hadows for {C}el {A}nimation},
  year = {2000},
  pages = {511--516},
}