I have one of my cameras set at a farther distance and many things pass in front of it. I only want when someone enters the gate and not when anyone goes out. Can I set it to do something like if the subject travels from point a to b it will trigger but from point b to point a not? I have the same issue on one of my doors. I want a shot of them coming up the walk not when they are going away. Is there a tutorial or does anyone have any screen shots of this. Thanks.