Plug-In Formula is a skeleton fractal formula that lets a fractal formula plug-in do the actual work. All fractal formulas in Standard.ufm are also implemented as fractal formula plug-ins. You can select any of these as the fractal formula plug-in to be used together with Plug-In Formula.
The Fractal Formula plug-in parameter sets the fractal formula plug-in to be used. By default, the Mandelbrot plug-in from Standard.ulb is selected.
An example of using Plug-In Formula is given in Example 1 - Formula plug-ins.
Standard fractal formulas