Here Katie has to perform the scene where she asks her clone some searching questions with just two green poles to show her where they will be standing and a green sheet of wood. Again, the camera is 'locked off' so it won't move at all - not even a millimetre! After Katie finishes the shot, the girls film themselves as the clones in front of the same green background pretending to hear the questions and answering them at hopefully the right moment! The green bits and pieces are removed revealing the bedroom and the locked off camera films this empty room for as long as we think the scene takes. The three shots are put on top of each other back at ILTV HQ and, again, wherever the computer sees green, it will show the background of the bedroom.. right up to the edges of the girls. Use the pause button to see how everything is slotted together!! Simple!!!!!
Here you can see three bits all at the same time before they are added together...
