This was an easy, but fun visual effect to do… The scene shows 2 kids trying to escape from the bad guys and they find themselves running on a small ledge in the underground metro between 2 stations… and, of course, the train is coming !!!…

The difficulty here was that, for some obscure reason, the Montreal metro authorities, where we shot the movie, did not want us to have our actors running on a very small ledge while a metro train was coming at full blast… go figure !!

So, first, we shot the train in the tunnel by itself (with the camera extremely well secured to the wall… because you wouldn’t believe the air displacement when this train flies by at 100 Km/h!!)… I then took all the measurements of where the camera was and of the tunnel shape, took my camera down there to get as many textures as I could… we went back in studio and there, we built a 20 meters long replica of the metro tunnel wall and ledge for the actors to run on… we then matched our camera position and… voila !!

Here is the final scene from the movie…

and here is a little exerpt from the “making of” dvd…