Efficient Conservative Visibility Culling Using
the Prioritized-Layered Projection Algorithm
J. T. Klosowski
and
C. T. Silva
IEEE Transactions on Visualization and
Computer Graphics
7(4), pages 365-379, October 2001
Abstract
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.
Index Terms: conservative visibility, occlusion culling, interactive rendering
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