A sphere can be transformed into a spheroid by either a scale
transformation or by changing the plot range while keeping the
bounding box ratios constant. These transformations are
specified by the spheroid control setting, which gives the
vertical over horizontal semi-axis ratio of the resulting
spheroid. A control setting less than 1 gives an oblate
spheroid, greater than 1 a prolate spheroid, and equal to 1 an
untransformed sphere. Though a scale and a plot range
transformation can generate the same spheroid, these
transformations differ in their effect on lighting. The scale
transformation leaves the lighting direction fixed, but the plot
range transformation applies the same transformation to both the
sphere and the light source. This distinction is shown by
introducing two light sources: a fixed cyan light source that is
excluded from the sphere to spheroid transformation and a
transformed magenta source that is included in the
transformation. The light angle control specifies a 0 to radian
inclination