In case anyone might be interested:   http://www.anu.edu.au/Physics/Searle/   this site has free stuff to download and samples of the graphics.   If you have other good graphics of relativistic effects, or computer animations, please add them to this thread.   these are by a group in Australia. they look pretty good to me.   Here is a more commercial presentation of the same stuff, it looks like: http://www.anu.edu.au/Physics/Savage/TEE/   Here is an article in an Australian physics