Yeah actually there is a tutorial for this. I think it's at castironflamingo.com but I'm not 100% sure. If that url isn't right, then you should be able to find the tutorial here with the search function. I got things to work in the version 3 beta but IIRC the tutorial was written for v2 so you should be fine. As far as your export settings, I don't think it'll really matter--the tutorial was on the PC using a utility called Grouper prior to exporting the models. Meanwhile I'm on a Mac w/o the Grouper utility and it worked fine for me. Basically it involves not only the transparency map but also setting up an opacity layer. Anyway the tutorial is pretty easy to follow.