Efficient conservative visibility culling using the prioritized-layered projection algorithm

James T. Klosowski, Cláudio T. Silva

Research output: Contribution to journalArticlepeer-review


We propose a novel conservative visibility culling technique based on the Prioritized-Layered Projection (PLP) algorithm. PLP is a time-critical rendering technique that computes, for a given viewpoint, a partially correct image by rendering only a subset of the geometric primitives, those that PLP determines to be most likely visible. Our new algorithm builds on PLP and provides an efficient way of finding the remaining visible primitives. We do this by adding a second phase to PLP which uses image-space techniques for determining the visibility status of the remaining geometry. Another contribution of our work is to show how to efficiently implement such image-space visibility queries using currently available OpenGL hardware and extensions. We report on the implementation of our techniques on several graphics architectures, analyze their complexity, and discuss a possible hardware extension that has the potential to further increase performance.

Original languageEnglish (US)
Pages (from-to)365-379
Number of pages15
JournalIEEE Transactions on Visualization and Computer Graphics
Issue number4
StatePublished - Oct 2001


  • Conservative visibility
  • Interactive rendering
  • Occlusion culling

ASJC Scopus subject areas

  • Software
  • Signal Processing
  • Computer Vision and Pattern Recognition
  • Computer Graphics and Computer-Aided Design


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