Larger values generate taller and rougher landscapes, while smaller values generate flatter and smoother landscapes. Changing FrDim value does not affect the current landscape, only landscapes generated after the new value has been entered. This value is also used by the Fractlz button when determining the amount of fractalization to be performed on an existing landscape. The Frctlz button is used to change the roughness of the current landscape. It uses the number in the FrDim numerical gadget to determine the amount of fractalization to be done on the landscape.
Low values smooth the landscape, while higher values cause the landscape to become rougher.
The buttons right below the Fractlz button are the fractal divisor. These button determine the scale where fractalization occurs. Fractalizing is also good for adding detail to landscapes that don't have much detail of their own. Use the Stretch button to vertically stretch an existing landscape. This button causes peaks to grow taller and valleys to grow deeper.