180 DEGREE RULE
The idea is that if you stay within a 180 degree arc of a moving object, you won't have screen direction problems. Sometimes students have a hard time visualizing a 180 degree arc. My suggestion is to imagine a football game, and stay on the home team side—don't go over to the visitors, and you will be OK.
In fact, it you watch a televised football game, you'll notice that all the main cameras are on one side of the field. What would happen if they put a camera on the opposite side? From that camera, it would appear to viewers that the players are running the wrong direction.
This image looks down on a moving car. The idea here is to keep the camera on one side (it doesn't matter which) and stay on that side. If you do that, you won't have screen direction problems. Look at the image from each of the camera positions. As long as the camera stays on one side of the 180 degree arc, the car appears to keep its L-R direction. But putting the camera on the opposite side, and the car seems to be going R-L.
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