this will require some software in addition to sketchup to make this possible, however all of wich is freely available through the internet and is very easy to use, to begin we will need a drawing to render, for this instructable ive drawn some gears for us to use as a sample
Step 1: Getting the Software
next, you will need to get a copy of the sunflow rendering program, here:
Step 2: Rendering!
now, open up sunflow and load your model and click render!