Primary Classification:
  I. Computing Methodologies
  I.3 COMPUTER GRAPHICS
      I.3.2 Graphics Systems
          Subjects: Stand-alone systems**

Additional Classification:
  H. Information Systems
  H.5 INFORMATION INTERFACES AND PRESENTATION (I.7)
      H.5.1 Multimedia Information Systems
          Subjects: Animations

  I. Computing Methodologies
  I.3 COMPUTER GRAPHICS
      I.3.4 Graphics Utilities
          Subjects: Paint systems; Picture description languages**
      I.3.5 Computational Geometry and Object Modeling
          Subjects: Curve, surface, solid, and object representations
      I.3.7 Three-Dimensional Graphics and Realism
          Subjects: Animation

General Terms:
Design, Languages, Performance, Theory

Keywords:
billboards, gestural interfaces, scene description, stroke-based rendering