@InProceedings{Drettakis:1996:AVM,
  author =       "George Drettakis and Fran{\c{c}}ois Sillion",
  title =        "Accurate Visibility and Meshing Calculations for
                 Hierarchical Radiosity",
  booktitle =    "Eurographics Rendering Workshop 1996",
  editor =       "Xavier Pueyo and Peter Schr{\"{o}}der",
  year =         "1996",
  organization = "Eurographics",
  publisher =    "Springer Wein",
  address =      "New York City, NY",
  month =        jun,
  pages =        "269--278",
  note =         "ISBN 3-211-82883-4",
  annote =       "Precise quality control for hierarchical lighting
                 simulations is still a hard problem, due in part to the
                 difficulty of analysing the source of error and to the
                 close interactions between different components of the
                 algorithm. In this paper we attempt to address this
                 issue by examining two of the most central components
                 of these algorithms: visibility computation and the
                 mesh. We first present an investigation tool in the
                 form of a new hierarchical algorithm: this algorithmic
                 extension encapsulates exact visibility information
                 with respect to the light source in the form of the
                 backprojection data structure, and allows the use of
                 discontinuity meshes in the solution hierarchy. This
                 tool permits us to study separately the effects of
                 visibility and meshing error on image quality,
                 computational expense as well as solution convergence.
                 Initial experimental results are presented by comparing
                 standard quadtree-based hierarchical radiosity with
                 point-sampling visibility to the approaches
                 incorporating backprojections, discontinuity meshes or
                 both.",
}