I made a number of 'antcam' files a few years ago, including the trails link referenced above. The problem with the trails is that it quickly became unreadable on the most interesting days, as there were just too many lines. This got worse as more and more people started getting on SN. When it eventually stopped working correctly, I didn't see a need to try to fix it. The animations themselves were created using scripts to load placefiles into Grl3 for the correct point in time, doing a screenshot, and then repeating. Very 'brute force' but it worked.