How to plot line around STL object?

Hi all. I want to 'line' around stl object. How I can dot? the 1st I read stl file by using 'stlread', it return face and vertices but now I don't understand what is the relationship between face and vertices. Example the 'line' around stl object as show below.
Thank for all answer.

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on 28 Mar 2015

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