J. Bittner, M. Wimmer, H. Piringer, W. Purgathofer:
"Coherent Hierarchical Culling: Hardware Occlusion Queries Made Useful";
Computer Graphics Forum, 23 (2004), 3; S. 615 - 624.

Kurzfassung englisch:
We present a simple but powerful algorithm for optimizing the usage of hardware occlusion queries in arbitrary
complex scenes. Our method minimizes the number of issued queries and reduces the delays due to the latency of
query results. We reuse the results of occlusion queries from the last frame in order to initiate and schedule the
queries in the next frame. This is done by processing nodes of a spatial hierarchy in a front-to-back order and
interleaving occlusion queries with rendering of certain previously visible nodes. The proposed scheduling of the
queries makes use of spatial and temporal coherence of visibility. Despite its simplicity, the algorithm achieves
good culling ef ciency for scenes of various types. The implementation of the algorithm is straightforward and it
can be easily integrated in existing real-time rendering packages based on common hierarchical data structures.

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