\subsection{Express the octants of a sphere as a surface.}
\funclabel{s1023}
\begin{minipg1}
  To express the octants of a sphere as a surface. This can also
  be used to describe the complete sphere.
  The sphere/the octants of the sphere will be geometrically exact.
\end{minipg1} \\ \\
SYNOPSIS\\
        \>void s1023(\begin{minipg3}
          {\fov centre},  {\fov axis},  {\fov equator},  {\fov latitude},  {\fov longitude},  {\fov sphere},  {\fov stat})
        \end{minipg3}\\[0.3ex]
        \>\>    double \> {\fov centre}[\,];\\
        \>\>    double \> {\fov axis}[\,];\\
        \>\>    double \> {\fov equator}[\,];\\
        \>\>    int    \> {\fov latitude};\\
        \>\>    int    \> {\fov longitude};\\
        \>\>    SISLSurf \> **{\fov sphere};\\
        \>\>    int    \> *{\fov stat};\\
\\
ARGUMENTS\\
        \>Input Arguments:\\
        \>\>    {\fov centre}\> - \> Centre point of the sphere.\\
        \>\>    {\fov axis}\> - \> Axis of the sphere (towards the north pole).\\
        \>\>    {\fov equator}\> - \> Vector from centre to start point
                                      on the equator.\\
        \>\>    {\fov latitude} \> - \>
        \begin{minipg2}
          Flag indicating number of
          octants in north/south direction:
        \end{minipg2}\\[0.3ex]
          \>\>\>\>\> $= 1$ : Octants in the northern hemisphere.\\
          \>\>\>\>\> $= 2$ : Octants in both hemispheres.\\
        \>\>    {\fov longitude} \> - \>
        \begin{minipg2}
          Flag indicating number of octants along the equator.
          This is counted counterclockwise from equator.
        \end{minipg2}\\[0.3ex]
          \>\>\>\>\> $= 1$ : Octants in 1.\ quadrant.\\
          \>\>\>\>\> $= 2$ : Octants in 1.\ and 2.\ quadrant.\\
          \>\>\>\>\> $= 3$ : Octants in 1., 2.\ and 3.\ quadrant.\\
          \>\>\>\>\> $= 4$ : Octants in all quadrants.\\
\\
        \>Output Arguments:\\
        \>\>    {\fov sphere} \> - \> The sphere produced.\\
        \>\>    {\fov stat}     \> - \> Status messages\\
                \>\>\>\>\>              $> 0$   : warning\\
                \>\>\>\>\>              $= 0$   : ok\\
                \>\>\>\>\>              $< 0$   : error
\newpagetabs
EXAMPLE OF USE\\
        \>      \{ \\
        \>\>    double \> {\fov centre}[3];\\
        \>\>    double \> {\fov axis}[3];\\
        \>\>    double \> {\fov equator}[3];\\
        \>\>    int    \> {\fov latitude};\\
        \>\>    int    \> {\fov longitude};\\
        \>\>    SISLSurf \> *{\fov sphere} = NULL;\\
        \>\>    int    \> {\fov stat} = 0;\\
        \>\>    \ldots \\
        \>\>s1023(\begin{minipg4}
          {\fov centre},  {\fov axis},  {\fov equator},  {\fov latitude},  {\fov longitude},  \&{\fov sphere},  \&{\fov stat});
        \end{minipg4}\\
        \>\>    \ldots \\
        \>      \}
\end{tabbing}
