"Here is a script that calculates the 2D position of a 3D object on the rendered image depending on the camera properties and render resolution. Two files are exported containing animation curves to be loaded into Shake for tracking purpose. It doesn't matter if the object isn't visible on screen. Written to get a faster and more precise alternative for rendering out location layers and tracking them i.e. to animate a lens flares source.
'ShakeTracker' is now '2DTracker' since it can also generate an ascii file to import into the Combustion tracker (and maybe other packages?)."