I just want to show you a quick and easy method to create ambient occlusion using maya and vray. Its using the surface shader and the vray dirt.
If you are interested in the Scene Files, visit my Dropbox. dropbox.com/sh/b794iu1pkxcv9r9/3YeZSeNCgD
If you dont have Dropbox, register here for free: db.tt/IHNEOgCx