On the three-dimensional orthogonal drawing of series-parallel graphs (extended abstract)
Satoshi Tayu, Kumiko Nomura, Shuichi Ueno · 2008
It has been known that every 6-graph has a 3-bend 3-D orthogonal drawing, while it has been open whether every 6- graph has a 2-bend 3-D orthogonal drawing. For the interesting open question, it is known that every 5-graph has a 2-bend 3-D orthogonal drawing, and every outerplanar 6-graph without triangles has a O-bend 3-D orthogonal drawing. We show in this paper that every series-parallel 6-graph has a 2-bend 3-D orthogonal drawing.