**Authors: **[tex2html_wrap4198]*P. Bose, H. Everett, S. Fekete, A. Lubiw, H. Meijer,
K. Romanik, T. Shermer, S. Whitesides*

**Investigator username:** sue

**Category: ** perception

**Subcategory:** geometric algorithms

Visibility representations of graphs map vertices to sets in Euclidean space and express edges as visibility relations between these sets. We study a 3d visibility representation in which vertices are represented by axis-aligned rectangles parallel to the xy plane. Vertices are adjacent in the graph if and only if the rectangles that represent them see each other along a common line of sight parallel to the z axis.

baron@cim.mcgill.ca