You can do a projection show just like Disney with only a video projector, a laptop, and some video editing or presentation software. Set up your projector in exactly the place you want to project from. Make sure it has the settings set such that you can remember how to get them again. Hook up your laptop and set your laptop to the same resolution as the projector. Now using a full screen drawing program, trace the contours of the 3D object you are projecting on to create a 3D trace. Then use that trace as the background for your video so you know where stuff will end up. That is all there is to it. See http://bateshaunt.com for more.