Objects of this type are sphere segments, defined by the center of the sphere, the symmetry axis and two angles ΘMin and ΘMax according to the following scheme:

The dialog to set the object's parameters is this:

Here Location is the vector to the center of the sphere. The Radius vector points along the symmetry axis. Its length equals the radius of the sphere. The two angles are Θmin and Θmax (top and bottom, respectively), given in degrees. The angle range is 0°... 180°.

The definition of the interface covering sphere segments is the same as explained for rectangles.