• Occlusion sometimes there are markers that can't be seen by enough cameras, or markers may be blocked by props, limbs, bodies or other markers.
• Large dedicated space required (generally double the active area, based on field of view of camera)
• Challenging to calibrate and operate - - if any cameras are mis-aligned, readings from those cameras will be offset from the cameras that are properly aligned. This is particularly troublesome at 'hand-off' when the marker moves from one camera's view to the other - duplicate points may be created from the same marker, or the marker may suddenly jump.
• Requires highly skilled operators
• Time consuming and difficult to track (clean up / interpret data)
• Sweet spots accuracy varies throughout the motion capture area
• Crossover motion ambiguities- marker swapping, software gets confused about which marker is which, and assumes the actor's arms (or different actors) have gone through each other.
• Missing or noisy data and false reflections - can necessitate re-shooting parts of a session.
• Expense - $150,000 to $250,000 and more.
• Sensitivity to light and reflections
• Non real-time (most optical systems)
• Position data only - deriving rotations from positional information adds to processing complexity.

Motion Captor has excellent resistance to occlusion, and can easily be set up in a wide variety of environments. Calibration is a breeze - requiring only a minute or two. It is very easy to learn and use and provides excellent quality data, requiring much less cleanup than other optical methods. It is reliable, and very resistant to errant light reflections.

Motion Captor is extremely affordable as well.