Hi Mark. I thought that rotoscoping was painting over certain sections of the image to create the effect you wanted, such as the the glow of a lightsabers. If we are talking about using the built in particle engine I will probably not be able to get it to work, as I have tried many times in the past with no success. I will try and post an image or two of what I mean later tonight when I return from the doctors. Also how does C6 Pro work on a mac. Are there any problems I should know about before purchasing it. I'm using OS X 10.4.11 Thanks. David