New results on a visibility representation of graphs in 3D

Fekete, Sandor P. and Houle, Michael and Whitesides, Sue (1996) New results on a visibility representation of graphs in 3D.
Published In: Graph drawing : Symposium on Graph Drawing, GD '95, Passau, Germany, September 20 - 22, 1995 ; proceedings, Lecture notes in computer science. 1027 Springer 1996, pp. 234-241.


This paper considers a 3-dimensional visibility representation of cliques Kn. In this representation, the objects representing the vertices are 2-dimensional and lie parallel to the x,y-plane, and two vertices of the graph are adjacent if and only if their corresponding objects see each other by a line of sight parallel to the z-axis that intersects the interiors of the objects. In particular, we represent vertices by unit discs and by discs of arbitrary radii (possibly different for different vertices); we also represent vertices by axis-aligned unit squares, by axis-aligned squares of arbitrary size (possibly different for different vertices), and by axis-aligned rectangles. We present: a significant improvement (from 102 to 55) of the best known upper bound for the size of cliques representable by rectangles or squares of arbitrary size; a sharp bound for the representation of cliques by unit squares (K7 can be represented but Kn for n>7 cannot); a representation of Kn by unit discs.

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ZAIK Number: zpr95-207
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Date Deposited: 02 Apr 2001 00:00
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