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Conference Papers Year : 2001

Instant Visibility

Peter Wonka
  • Function : Author
Michael Wimmer
  • Function : Author


We present an online occlusion culling system which computes visibility in parallel to the rendering pipeline. We show how to use point visibility algorithms to quickly calculate a tight potentially visible set (PVS) which is valid for several frames, by shrinking the occluders used in visibility calculations by an adequate amount. These visibility calculations can be performed on a visibility server, possibly a distinct computer communicating with the display host over a local network. The resulting system essentially combines the advantages of online visibility processing and region-based visibility calculations, allowing asynchronous processing of visibility and display operations. We analyze two different types of hardware-based point visibility algorithms and address the problem of bounded calculation time which is the basis for true real-time behavior. Our results show reliable, sustained 60 Hz performance in a walkthrough with an urban environment of nearly 2 million polygons, and a terrain flyover.
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Dates and versions

inria-00510048 , version 1 (17-08-2010)


  • HAL Id : inria-00510048 , version 1


Peter Wonka, Michael Wimmer, François X. Sillion. Instant Visibility. Eurographics, Eurographics, 2001, Manchester, United Kingdom. ⟨inria-00510048⟩
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