The file that I import from Sketchup as an Attribute Dictionary associated to some faces (see http://www.sketchup.com/intl/en/developer/docs/ourdoc/attributedictionary) . I wonder if when the file is imported into Rhino, these attributedictionary is translated into an UserDictionary?
So far I have seen that there are UserData but I still have to understand how to read them. To go faster, I am using the C# script module of Grasshopper but so far, the results are frustrating. I definitely have to spend more time to understand well how it works, but in the meantime, if someone has the answer, it would be great.