I publish my Ovni(UFO) used on this scene on Blend swap, if you like my OVNI-GT just download and use it !
A year or two ago I made this scene to learn camera tracking with Voodoo and integrate data from the camera and objects in Blender. If I remember right the render for this scene was about 7 or 8 hours in blender internal, I just remember hit F12 and go to sleep
The camera tracking can be improved and the lighting etc. .. but for a first contact I think I got an acceptable result .. except the problem with a fence at the end of the video :)
I abandon this project due to time and later to know the existence of the development of the tomato branch so I decided to wait for the camera tracking was available in the official version of blender.
Tracking camera is already built into blender… but I’d rather wait to do this kind of scenes when the development of render layers in cycles render is a little more developed.
Here you can see the finish result:
