title =      "CHC++: Coherent Hierarchical Culling Revisited",
  author =     "Oliver Mattausch and Ji{\v r}{\' i} Bittner and Michael
  year =       "2008",
  abstract =   "We present a new algorithm for efficient occlusion culling
               using hardware occlusion queries. The algorithm
               significantly improves on previous techniques by making
               better use of temporal and spatial coherence of visibility.
               This is achieved by using adaptive visibility prediction and
               query batching. As a result of the new optimizations the
               number of issued occlusion queries and the number of
               rendering state changes are significantly reduced. We also
               propose a simple method for determining tighter bounding
               volumes for occlusion queries and a method which further
               reduces the pipeline stalls.  The proposed method provides
               up to an order of magnitude speedup over the previous state
               of the art. The new technique is simple to implement, does
               not rely on hardware calibration and integrates well with
               modern game engines.",
  pages =      "221--230",
  month =      apr,
  number =     "2",
  event =      "EUROGRAPHICS 2008",
  issn =       "0167-7055",
  journal =    "Computer Graphics Forum (Proceedings Eurographics 2008)",
  volume =     "27",
  location =   "Crete",
  keywords =   "temporal coherence, dynamic occlusion culling, occlusion