@inproceedings{Martin:1999:VLM,
  optpostscript = {},
  optorganization = {},
  author = {Domingo Mart{\'{\i}}n and Juan Carlos Torres},
  optkey = {},
  optannote = {},
  optseries = {},
  editor = {M. A. Alberti and G. Gallo and I. Jelinek},
  url = {http://www.eg.org/EG/DL/Conf/EG99/short},
  address = EGAdr,
  localfile = {papers/Martin.1999.VLM.pdf},
  optisbn = {},
  publisher = EGPub,
  optkeywords = {},
  optmonth = {},
  optciteseer = {},
  optdoi = {},
  optcrossref = {},
  optwww = {},
  booktitle = EUROGRAPHICS1999Abstr,
  optvolume = {},
  optnumber = {},
  abstract = {There has been great interest in expressive visualization over the
              last few years. This kind of visualization is used in 2D
              animation, illustration, and schematic drawing. The flat shading
              and shape lines, which we call external and internal sketches, are
              all visual characteristics of this type of visualization. We
              present an algorithm for obtaining the sketches from a polygonal
              model. The algorithm is based on the concept of virtual lights,
              which allows us to control the visualization of internal sketches
              in a flexible way.},
  title = {{V}irtual {L}ights: {A} {M}ethod for {E}xpressive {V}isualization},
  year = {1999},
  pages = {67--70},
}