Many architects and building designers use Sketchup for mass modelling and concept work and then export the Sketchup model and import it into Revit. Up until the release of Sketchup 14, 15 and 16 there was an issue with triangulating. I won’t go into the reason for this all you really need to know is it looked terrible and was difficult to work with.
Select File menu top RHS of Sketchup, hover over Export in the menu, select 3D model, go to the bottom of the dialogue box and click the drop down next to save File As, you will see IFC File (*.IFC) and a list of other export formats. Select IFC and then click export. Remember to save the file in a location you can easily find. NOTE This option is only available is Sketchup Pro. Sketchup has 2 versions, Sketchup Make and Sketchup Pro. You can download them both for free here http://www.sketchup.com/download/all
Sketchup pro has a free 30 day trial so you will be able to export IFC, DWG and many other file formats that come with the pro version.
IFC is by far the most accurate method although the textures you use will not come out in Revit.
If you want to test or find a Sketchup model that is low in poly count you can get a good quality model from RubySketch here Get a Sketchup model here these models are also free.
Once you open your model in Sketchup you can simply go to File export 3D model IFC and then import the IFC model into Revit. Depending on the version of Revit you are suing you can also import Sketchup files.
You can also find more information here http://www.revitcity.com/forums
You may also be happy to know that Sketchup has Plugins. I am not sure if you are aware of PlusSpec? PlusSpec it is a parametric modeller that automatically attributes individual items, walls, roofs, stairs, windows and structure so that when you bring your model in to Revit it will automatically be classified which essentially means you can extract vital information that will optimise your workflow.
Andrew is the founder and creator of RubySketch, BIMBits 3D model library, and PlusSpec. He has over 26 years experience as a Builder and has an Advanced Diploma in Architectural Technology.