SketchUp sometimes does a very poor job of reading the DWG or DXF file that Revit exports -- especially if you're transferring complex, curved surfaces. It may omit many edges, which can create random holes in the curved surfaces.

I tried another strategy -- using Rhino to create an intermediate 3DS version -- and it seems to yield a much better result. 

If you're working in ArchiCAD and transfer your model into Revit using the IFC file format, follow these steps to make it easier to incorporate the updates from ArchiCAD into the Revit model.

The key is to open the IFC file, save it as a separate Revit model file, and then link this intermediate Revit model into your main project model. Keeping the IFC data in a separate, linked Revit model will make it easy to update that part of the model as your ArchiCAD model continues to evolve.

• Capture the topographic data from Google Earth
• Export the topographic data as a DWG file
• Import the topographic data into Revit
• Convert the linked DWG file into a toposurface
• Adjust your view of the toposurface

• Exporting the Rhino elements as a 3DS file and choosing the export settings
• Importing the 3DS file into a SketchUp model
• Scaling the imported component (if needed) and exploding it into individual elements

• Preparing and exporting the Revit model as a DWG file
• Importing the DWG file into a SketchUp model
• Scaling the imported component (if needed) and exploding it into individual elements