ABSTRACT
We should discuss a bit about how roto programs apply tracking data to shapes. This discussion might be slightly tenuous since no one program labels its roto tools exactly the same as the others, but we’ll see if we can’t break the concept down into more general terms. Sometimes the tracking data doesn’t make the allotted shape perfectly isolate the focus object. This tracking data can be applied in a number of ways—position, rotation, scale, and corner pinning and stabilization—but for the moment, we’ll take them one at a time. The most indicative point would probably be that the footage has easily trackable elements that specifically isolate the rotation and movement of the camera. Corner pinning takes various motion trackers and uses their resulting coordinates to apply a nonuniform transform to the shape to which they’re applied.
