Jon Peddie sent me a link to this clever commercial for the Mercedes SLS, showing it roll 360-degrees around the inside of the China Bar Tunnel in British Columbia, Canada (Supposedly).  Watch it closely, and see if you can tell if it’s CG?

I’m pretty sure it is, but it’s quite well executed.  One giveaway I noticed was that the beginning of the curve (the 2:15 mark) is shot from a wall-mounted camera just narrowly missed by the passing car, however this camera doesn’t actually appear in the driver’s view.  In fact, I don’t see any cameras at all.

Of course, there is also the matter of physics, where it doesn’t matter how fast forward you go, Gravity still pulls Down so you have to generate Lift to counter it.  If they were generating that kind of lift, the car would fly off the road.

Update: Commenter pboin points out the dangers of posting before coffee, as the real physics effect here would not be lift but downforce (eg. a force pulling the car ‘down’ towards the wall, or up towards the ceiling when it’s upside down).  Certain race cars, like F1 racers, generate pretty substantial downforce to increase traction and improve handling, but I doubt the Mercedes SLS is in that class.