I have just finished my online user group, which I call Short Sharp Training (monthly). This month we looked at the Camera Match Plug-in from Matt Panzer (http://www.panzercad.com) This is a fantastic addition to Vectorworks, it will let you combine a photo and a 3D model in a very short time. If you need to show your clients what the 3D model will look like in place, this is the tool for you.
With out this tool, you can spend hours getting the photo montage to look right. With this tool, you can do it in 10 – 15 minutes!