There are a wide variety of 3D Models that can be added as data sources in InfraWorks. The options for 3D Models Files are .3ds, .dae, .dxf, .fbx, and .obj. With the right version you can also add IMX, Revit, IFC, and LandXML files as well. But for this post, I am going to be working with .fbx files exported from Revit.
FBX is a 3D exchange format that can be used and generated by a variety of programs and tools. In Revit, FBX is towards the top of the Export menu.
Like with any 3D export, you want to make sure you are in a 3D view. Unlike with DWG or IFC export, there are not many settings to be adjusted.