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Overall Distance Constraints
When an object track has little perspective, it can jitter large amounts in depth, ie the distance from the camera to the object. SynthEyes allows you to create an overall distance constraint to control and de-jitter that distance using the solver locking panel. You should track and solve the shot, then set up a distance constraint using the computed distance as a guide: the graph editor and Get 1f buttons on the solver locking panel make this easy to see and control. Then when you Refine the solution, the distance will match what you have set up—ie a nice smooth curve. Since such shots contain little perspective to start with, extreme precision in depth is not required.
When you use an overall distance constraint, the distance is measured from the camera to the origin of the object (or for plain camera solves, from the camera to the
overall coordinate system origin). For moving objects tracks with distance constraints, you should pay some attention to the location of the origin. You must be certain to set up a coordinate system for the object!
You should set up the origin either at the natural center of rotation of the object (for example, at the neck of a head), or at a point located within the point cloud of the object. If the origin is well outside the object, any small jitter in the orientation of the object will have unwarranted effects on its position as well.
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