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With the constraints checkbox on, SynthEyes attempts to force the coordinate values to the desired values. It can sometimes be helpful to force the coordinates to be exactly the specified value, by turning on the Peg button on the tracker’s Coordinate system panel.
Pegs are useful if you have a pre-existing scene model that must be matched exactly, for example, from an architectural blueprint, a laser-rangefinder scan, or from global positioning system (GPS) coordinates. Pegging GPS coordinates is especially
useful in long highway construction shots, where overall survey accuracy must be maintained over the duration of the shot.
Pegs are active only when the Constrain checkbox is on, and you can only peg to numeric coordinates or to a tracker on a different camera/object, if the tracker’s camera/object is Indirectly solved. You can not peg to a tracker on the same camera/object, this will be silently ignored.
The 3-D error will be zero when you look at a pegged tracker in the Constrained Points view. However, the error on the coordinate system or tracking panel, as measured in horizontal pixels, will be larger! That is because the peg has forced the point to be at a location different than what the image data would suggest.
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