Adaptive Global Visibility Sampling

@article\{BITTNER-2009-AGVS,
  title =      "Adaptive Global Visibility Sampling",
  author =     "Jiri Bittner and Oliver Mattausch and Peter Wonka and Vlastimil Havran and Michael Wimmer",
  year =       "2009",
  abstract =   "In this paper we propose a global visibility algorithm which computes from-region visibility for all view cells simultaneously in a
progressive manner. We cast rays to sample visibility interactions and
use the information carried by a ray for all view cells it
intersects. The main contribution of the paper is a set of adaptive
sampling strategies based on ray mutations that exploit the spatial
coherence of visibility. Our method achieves more than an order of
magnitude speedup compared to per-view cell sampling. This provides a
practical solution to visibility preprocessing and also enables a new
type of interactive visibility analysis application, where it is
possible to quickly inspect and modify a coarse global visibility
solution that is constantly refined.",
  pages =      "94:1-94:10",
  month =      aug,
  issn =       "0730-0301",
  journal =    "ACM Transactions on Graphics",
  event =      "ACM SIGGRAPH 2009",
  note =       "Proceedings of ACM SIGGRAPH 2009",
  number =     "3",
  volume =     "28",
  location =   "New Orleans, USA",
  keywords =   "visibility, visibility sampling, occlusion culling, PVS",
  URL =        "http://www.cgg.cvut.cz/members/bittner/publications/agvs/",
}