How do people do the bonnet reveals? I.e. When they have a phot of the car and the bonnet appears see through and you see the engine through it.
The way I would do it (being a photographer) would be to photograph the car with the camera on a tripod once with the bonnet on and bonnet off...then in photoshop place one image over the other, then start to reduce the opacity of the identical image to make the bonnet vanish. You can fine tune this by increasing or decreasing the opacity depending on how much you want the bonnet or engine shown. Make sure the camera isn't moved as this will effect it being an identical shot. Some other people might have other ideas but this is how I would do it. I hope this helps