2009

Camera Tracker:Troubleshooting
Feature Tracking Halts Immediately
If the feature tracker attempts to match the first couple of frames but halts
immediately, check these steps:
1 One of the enabled error thresholds might be set too low. Perform a Check
Status in the Batch Track rollout and look at the reports in the Tracking
Error Review list. Also try disabling the thresholds in the Error Thresholds
rollout one at a time and see if this fixes the problem. Adjust the
problematic threshold as needed. You can also disable error threshold
checking altogether by turning off the Resample On Error check box in
each of the trackers.
2 Make sure the search bounds box for each tracker is big enough to
accommodate the frame-to-frame motion of the feature. This needs to
be at least big enough to enclose the moved feature and the surrounding
contrast area you’ve selected in the feature bounds box.
3 Make sure the scene objects are associated correctly with their trackers.
You can verify this by checking the entries in the list at the top of the
Motion Trackers rollout. If there is an object associated, you will see its
name in the list entry, if not you will see “<no object>”. If you open a
movie file for which you have previously set up trackers in the camera
tracker before you open the associated 3ds Max scene, the objects won’t
be associated with their trackers. You should make sure the correct 3ds
Max scene is open then close and reopen the movie file in the Camera
Tracker so that it can now find the scene objects.
4 If you have inadvertently swapped the scene objects for one or more pairs
of trackers, the match-move can’t find a solution.
Repeated Match-Move Errors
If you get repeated camera match-move errors, here’s a list of things to check:
1 Make sure there are at least six features actively being tracked at the error
frame and that at least two of them are a good distance out the plane of
the others.
2 Check the tracker gizmos in the Movie window around the frame on
which the error occurs to ensure that no obvious feature tracking errors
exist.
Camera Tracker Utility | 3851