What tool were you using to export your BIM data? If Revit, there is a much simpler way using Datasmith and the Revit plug-in we support. If Archicad, you will soon be able to export C4D files and load them with our new C4D importer (4.23). You can also try exporting SketchUp files from Archicad and importing with our current SketchUp plugin.