In a four part tutorial, Junghwo Park explains how to export a gable truss structure created in Revit, into Karamba and finally back into Revit again.
These two tutorials (part 2 and 3) explain the process of importing the .dwg file (created in the Tutorial 1 – Export a Gable Truss Structure from Revit) into Rhino and then Grasshopper. The geometry can then be set up in Karamba to perform a structural analysis.
The last tutorial shows how to take the Karamba structural model and import it into Revit again using Geometry Gym. See Tutorial 4 – Export a Gable Truss Structure to Revit with Geometry Gym/Rhynamo.