The shot I’m doing right now features a foreground Saucer descending to a stop. Because the saucer is supposed to be closer to the camera than the others in the background, I wanted to simulate a bit of a perspective shift as it comes into the screen. For this effect, I stretched the image of the saucer vertically and positioned it just above the frame (see Frame 1 from the diagram below). Then, as I move it down into the frame, I squash the image back to it’s normal aspect (see Frame 70). By planning the timing just right, this gives the illusion of a shift in the viewing angle that would naturally be occuring with a 3D object.