@inproceedings{4073, abstract = {A number of rendering algorithms in computer graphics sort three-dimensional objects by depth and assume that there is no cycle that makes the sorting impossible. One way to resolve the problem caused by cycles is to cut the objects into smaller pieces. The problem of estimating how many such cuts are always sufficient is addressed. A few related algorithmic and combinatorial geometry problems are considered.}, author = {Chazelle, Bernard and Edelsbrunner, Herbert and Guibas, Leonidas and Pollack, Richard and Seidel, Raimund and Sharir, Micha and Snoeyink, Jack}, booktitle = {31st Annual Symposium on Foundations of Computer Science}, isbn = {0-8186-2082-X}, location = {St. Louis, MO, United States of America}, pages = {242 -- 251}, publisher = {IEEE}, title = {{Counting and cutting cycles of lines and rods in space}}, doi = {10.1109/FSCS.1990.89543}, year = {1990}, } @article{4070, abstract = {Let S be a set of n closed intervals on the x-axis. A ranking assigns to each interval, s, a distinct rank, p(s)∊ [1, 2,…,n]. We say that s can see t if p(s)