GeoMetrix is a plugin to a terrific program called Setting Sun. A Setting Sun plugin, which is called a Fader, is essentially a screen saver. GeoMetrix was inspired by some of the first screen savers to appear on the Macintosh. GeoMetriX is freeware. e. You are not allowed, however, to charge for it or use it commercially without explicit written permission from the author. This fader was inpsired by some of the first screen savers that I saw on old 680x0 Macs. In the latest version, you can select how many points and trails the shapes have as well as how fast the color changes and whether or not the old shapes get erased, which when turned off creates amazing patterns on screen.