Ideal tracking conditions are achieved when all joints are visible in all cameras; however, this is rarely attainable due to occlusions from other limbs, people, and the environment. At a minimum, each joint must be visible in at least three cameras. When setting up the cameras it is important to position and orient the cameras in a way that minimizes occlusions while simultaneously providing views of the subject(s) from varying angles to improve joint depth and position calculations. For example, a purely sagittal view results in several occlusions and poor tracking from that view but provides useful information for identifying the depth of joints tracked in a more frontal view. When combined, cameras with diverse 3D positions providing useful, clear views of the subject should provide strong tracking.