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Since the topic of making movies has been raised, I have to chip in. Most graphics programs can create a sequence of frames that, when combined together, show a rotating object. However, the procedure of combining these frames into a movie is problematic for people who are not aware of the ridiculously fast and free program called "mencoder", which is a part of MPlayer. Mencoder runs in linux, windows and osx: http://www.mplayerhq.hu/homepage/design7/news.html Here is a command line that takes all PNG files in a directory and puts them together into an AVI file: mencoder "mf://*.png" -mf fps=25 -o output.avi -ovc lavc -lavcopts vcodec=msmpeg4:vbitrate=9000 the important and variable switches used: fps - frames per second vcodec=msmpeg - Microsoft MPEG-4 codec (playable with "Windows-native" codec on all windows machines, as opposed to vcodec=mpeg, which is a DivX codec and requires installation of DivX) vbitrate=9000 (9 kB per sec - high quality movie, can be increased or decreased) If you decide to install the entire MPlayer package, the resulting movie can be played using mplayer. Petr
