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Part of the answer to my question is that the trapezoid elements in GraphElementData are set up for use with vertices as shown here: Table[EdgeTaggedGraph[{1 \[UndirectedEdge] 2, 2 \[UndirectedEdge] 3, 3 \[UndirectedEdge] 1},...
I really like your idea. Thanks! The Autodesk-related file formats seemed the closest to success.
Thanks. That's very hepful.
Thanks. That looks helpful.