AGVS: Adaptive Global Visibility Sampling

Описание: Jiri Bittner, Oliver Mattausch, Peter Wonka, Vlastimil Havran and Michael Wimmer
ACM Transactions on Graphics (Siggraph 2009)
http://dcgi.felk.cvut.cz/home/bittner...
In this paper we propose a global visibility algorithm which com-
putes 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 in-
tersects. 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 en-
ables 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.