It's no secret that a whole lot of money and effort goes into visual effects these days, with film studios constantly pushing the limits of what's possible and how realistic CGI can look. Robert Zemeckis' film Contact was one of the first to push the boundaries and includes what is supposedly the longest ever continuous single digital FX shot created. Since then budgets have increased and technologies have improved, resulting in films such as James Cameron's Avator blowing almost all of its $300 million budget on VFX.
Now, we're at a stage where the line between real and CGI is completely blurred, resulting in a seamless viewing experience where we don't even pick up on the cleverly modified scenes. As such, it's pretty interesting to have a behind-the-scenes look at what the film crews and actors physically worked with while on set. Here we have a selection of before-and-after scenes from the last few years' top films and TV shows.