Making a false background...

The final shot in the sequence shows the possessed lego hand jump through the wall. If it were to do this in real life it would leave ahole in which it jumped through. However as this isn't real we'll have to make one. I could make a false wall, comp it in then animate a hole being made in the fake wall Ive made but that doesn't make any sense because I would have to erase digitally the wall thats already there. So I decided to create a false hole via a masked alpha channel. However when the hole is made there is nothing behind it in the background. The solution to this was to take a still shot on a fish eye lens of the scenery behind the wall then align it correctly in 3dspace using the cam data from the matchmove. see image below.

 











The second part was to add the foreground video and use the alpha channel of the hole from the 3dsmax render to cut a hole on the video and reveal the background.