zoom (tween) movie
A zoom movie is a movie showing an animated zoom deep into the depths of a fractal image. Fractal eXtreme makes use of some unique technology to allow faster rendering of zoom movies, more compact storage of zoom movies, and more flexible playback of zoom movies.
By only calculating and storing key frames, the time to render and the space required to store zoom movies are both reduced. When you play the zoom movies, Cygnus Software's innovative FX Movie Player loads in the key frames and produces all of the intermediate frames on the fly. This process of creating inbetween frames from key frames is sometimes called "tweening." Because the frames are being created at playback time instead of at render time, you can adjust the playback speed and the window size of the movie.