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You can use SynthEye's animated splines (on the Roto panel) as one method to control ViewShift:
Viewing splines limit pixels to shift only into within the included areas of the viewing image, typically for removals;
Source splines limit pixels to be sourced only from within the included areas of the source shot, typically for pulling pixels for a split take;
Garbage splines prevent pixels from being transferred within their area of the source or view shots, for minor fixups to meshes or other splines.
For example, when removing the car from the example shot, we use a viewing spline that travels along with the car—pixels are transferred from the source (several frames earlier or later) only within that spline to wipe out the car.
If there are several viewing splines, pixels are transferred if they fall within any of the viewing splines, similarly if they fall within any of the source splines, or any of the garbage splines.
ViewShift must be told whether or not to use each type of spline via the Use Source Splines, Use Viewing Splines, and Use Garbage Splines checkboxes (all off by default). Those settings determine not only whether splines are examined at all, but whether splines should be interpreted as source or viewing splines when the source and viewing camera are the same (more details on that case below).
Each shot has a large default spline (around the entire image) used for auto- tracking. To prevent interference with ViewShift, it must be deleted or disabled at the beginning of the shot.
When creating new splines, be sure to set the spline's object selector to the camera (Camera01 etc) or Garbage appropriately — new splines are garbage by default.
Tip: Use the Import Tracker to CP button to speed up creating splines if you can create a tracker that follows the feature of interest, for example on the car; you can then import it to the spline's center point to cause the entire spline to move. Then just tweak the corners over the length of the shot as needed.
If you have a ViewShift where you want to use both (different) source and viewing splines, and the source and viewing camera are the same, here's what to do... create a dummy moving object (make its solving mode Disabled), assign the splines you want to use as sources to this moving object, and set the source camera(/object) to be the moving object. (ViewShift will use the source camera of the moving object for the rest of its processing.)
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