Thank you very much! It helped me a lot to understand the concept… but I will need null points AND an After Effects Camera, to export a script to use in a 3D application (3DS Max), where I´ll use the tracked camera movements. The project is a widening and modernization of a long road. The current road will be shot by a drone with a few long shots of the main stretchs and features of the road. I will need to put a new (3D) road over the current one, and the only reason I need to make it in 3D is because I will need to add moving vehiches travelling the new and improved road!