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J. Bittner, O. Mattausch, P. Wonka, V. Havran, M. Wimmer:
"Adaptive Global Visibility Sampling";
ACM Transactions on Graphics, 28 (2009), 3; S. 1 - 10.

In this paper we propose a global visibility algorithm which computes from-region visibility for all view cells simultaneously in a progressive manner. We cast rays to sample visibility interactions and use the information carried by a ray for all view cells it intersects. The main contribution of the paper is a set of adaptive sampling strategies based on ray mutations that exploit the spatial coherence of visibility. Our method achieves more than an order of magnitude speedup compared to per-view cell sampling. This provides a practical solution to visibility preprocessing and also enables a new type of interactive visibility analysis application, where it is possible to quickly inspect and modify a coarse global visibility solution that is constantly refined.

http://dx.doi.org/10.1145/1576246.1531400