Back in December 2013, I discussed structural cross section analysis, i.e. determination of the cross section profile of beam, columns, braces, etc., and several completely different approaches one can take to achieve that. I also demonstrated how to make use of the powerful functionality provided by the REX toolkit without building the entire add-in on top of the REX framework. By the way, here are some other earlier discussions of REX: The REX SDK Extensions for Revit 2012 REX Content...
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