This data item defines a spherical segment in space. Other data items can check if nodes are located on this geometry. The coordinate of the center is x_c y_c z_c. If side_x is set to a positive value, say +1., then only x-values larger then x_c are considered to be part of the geometry. If side_x is set to a negative value, say -1., then only x-values smaller then x_c are considered to be part of the geometry. If side_x is set to 0 , then all x-values are considered to be part of the geometry. Likewise remarks hold for y- and z-values.
All node within a distance tolerance of radius are considered to be part of the spherical segment.