I've been doing a LOT of studying on this topic lately and found that it's hard to make it perfect. And there really isn't any documentation on it at all. Here are some of my past posts, perhaps they can help you out. http://www.renderosity.com/messages.ez?ForumID=107&Form.ShowMessage=1085957 http://www.renderosity.com/messages.ez?ForumID=107&Form.ShowMessage=1084274 http://www.renderosity.com/messages.ez?ForumID=107&Form.ShowMessage=1083319 and my first attempt http://www.renderosity.com/messages.ez?ForumID=107&Form.ShowMessage=1083055