A pixmap of fractal clouds is generated. Selecting clouds sets the default for fractal dimension to 2.15 and power scale factor to 0.75. If no dimension is specified, 2.4 is used when generating planets and 2.15 for clouds. The default value of 0.75 makes the polar caps extend toward the equa- tor across high terrain and forms glaciers in the highest mountains, as on Earth. Higher values make ice sheets that cover more and more of the land surface, simulating planets in the midst of an ice age.
Lower values tend to be boring, resulting in unrealistic geometrically-precise ice cap boundaries.
The default level of 0.4 produces ice caps similar to those of the Earth. Smaller values reduce the amount of ice, while larger -ice settings create more prominent ice caps. The inclination angle of the planet with regard to its primary star is set to angle, which can be any floating point value from -90 to 90. Positive values represent summer in the northern hemisphere, nega- tive values summer in the southern hemisphere. If no inclination angle is specified, a random value between -21.6 and 21.6 degrees is chosen.