But since the shadows on the Falcon's cockpit window struts don't appear to change for the brief duration of the matte-lined asteroid's passage, could a new larger asteroid be placed over the top of the existing one, AND the Falcon's window struts, and only once that had been done then going back and overlaying the original struts on top of the new matte-free asteroid? This would certainly save the fiddly work of trying to rotoscope 'behind' the window struts... But then again, I fully concede that I could easily not know what on Earth I'm talking about, as I have no idea if my suggestion is even possible, let alone any easier to accomplish.