With a movie like Terminator Salvation, you know the VFX are gonna be a huge part.  With Terminator specifically, you know most of the characters (the Terminator Robots) will be CG and VFX, and put it on the other side of “Judgement Day”, and you know most of the environment will as well.  With so much of the movie in the hands of the Visual Effects crew, they have alot to talk about.

“We re-projected this onto the (CG bridge) so I could have the truck fall over the edge, because in the original, it didn’t fall over the edge,” Snow said. And “those sort of techniques are just some of the things that we’ve been perfecting over the years: re-projection, the ability to say, ‘Well, we can go and do this, shoot at three different locations, and we don’t always have to use blue screen.’ …We can make it so you don’t know which bit of the bridge is CG.”

via Visual effects shoots for realism in explosive ‘Terminator Salvation’ | Geek Gestalt – CNET News.