Xero wrote a nice tutorial about tracing 3D objects within PV3D. He made the demo and source available, which you can see through is original post.
Tutorial – Tracing 3D objects with papervision3D
About the Author: Carlos Pinho
A father, a husband and a geek... Carlos was the founder of projects like The Tech Labs and Flash Enabled Blog. He is the founder of TekTuts He is passionate about technologies. Their main skills are in analytics, transport & logistics, business administration. He also writes about programming resources, trends, strategy and web development.