@article{1063732,
 author = {Roden, Timothy and Parberry, Ian},
 title = {Portholes and planes: faster dynamic evaluation of potentially visible sets},
 journal = {Computers in Entertainment},
 volume = {3},
 number = {2},
 year = {2005},
 issn = {1544-3574},
 pages = {3--3},
 doi = {http://doi.acm.org/10.1145/1063723.1063732},
 publisher = {ACM},
 address = {New York, NY, USA},
 }