Motion tracking, when it works well, allows you to impart the motion contained within a live-action piece of footage to a new element, such as a 3D render or bitmap artwork. However, this requires some pattern within the footage to be trackable (that is, distinct and unoccluded for the entire duration). If the camera or subject moves aggressively, such a pattern can be difficult to find. Nevertheless, there are tricks you can use to tease out something usable.
This chapter includes the following critical information:
• Motion tracking terminology
• Common motion tracking problems and solutions
• “Hopping” ...