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How to get hole(innerboundary) of a shape in cityengine?

Question asked by lvzhihan on Jan 31, 2016
Latest reply on Feb 1, 2016 by CLau-esristaff

I tried to get hole of shape in cityengine, but it doesn't work. I have exported 'vertices' of shapes by python, while the 'vertices' attribute of object includes both outerboundary and innerboundary, which cannot distinguish innerboundary from outerboundary.

Is there any method to get the hole from a shape ?