torsion free nodes

Defi nition Assume that all edges of a mesh are equipped with a plane which contains that edge. A vertex where the intersection of planes associated with adjacent edges is a straight line is called a node without torsion, and that line is called the node axis.

Problem. Is it possible to fi nd meshes (and associated planes) such that vertices do not exhibit torsion, possibly by minimally changing an existing mesh?

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