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The auto-tracker identifies many features (blips), and combines them into trails, but only converts a fraction of them to trackers to be used in generating the 3-D solution. Some trails are too short, or crammed into an already densely-populated area.
SynthEyes allows you to specify that additional blip trails should be promoted to trackers, either by manually specifying a trail to be converted, or by using the Add Many dialog to locate many more potential trackers, often in a special area of interest.
Important : do not do a Clear All Blips or Clean Up Trackers (with Clear Blips enabled) before attempting to use either method of converting blip trails to trackers. If the blips are cleared, there will be no raw auto-track data to create trackers from.
If you wish to have a tracker at a particular location to help achieve an effect, you could create a supervised tracker, but a quicker alternative can be to convert an existing blip trail into a tracker—in SynthEyes-speak, this is Peeling a trail.
To see this, open the flyover shot and auto-track it again. Switch to the Feature panel and scrub into the middle of the shot. You’ll see many little squares (the blips) and red and blue lines representing the past and future paths (the trails).
You can turn on the Peel button, then click on a blip, converting it to a full tracker.
Repeat as necessary.
Use the controls at the bottom of the Feature panel to show only the longest potential trails—here we will show only those that are 100 frames or longer. If you have corner detection on, you can select only corners as well.
Alternatively, you can use the Add Many Trackers dialog to do just that in an intelligent fashion—after an initial shot solution has been obtained.
The Add Many Trackers dialog searches the auto-tracking data for additional trails that can be converted to trackers. It allows you to specify your requirements for the trackers to be added, such as a minimum length, maximum error, or coverage of a certain range of frames.
And, especially for mesh building, it allows you to use a previous camera-view lasso to indicate an area in which new trackers should be selectively added. The new trackers are chosen so that they are evenly distributed over the lassoed area to the extent possible. (If there are few or no significant blips in an area, nothing can be added there).
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