This setting is an int value that specifies the amount of periodicity checking that the fractal formula uses by default. If it is not specified, Ultra Fractal uses the default value Normal (2). This value can range from 0 to 3, where 0 means no periodicity checking, and 3 means full periodicity checking (called Rough in the Formula tab of the Layer Properties tool window).
This setting can only be used in the default section of fractal formulas. When the fractal formula is selected, Ultra Fractal resets the periodicity checking setting to the specified value.
default: periodicity = 0