typedef union {
    Xgl_plane           planar;
    struct {
        Xgl_pt_f3d      axial_pt;
        Xgl_pt_f3d      axis_dir;
        float           radius;
        Xgl_boolean     norm_flag;
    } cylindrical;
    struct {
        Xgl_pt_f3d      apex;
        Xgl_pt_f3d      axis_dir;
        float           cone_angle; /∗ 0 = zero width cone (line)∗/
        Xgl_boolean     norm_flag;
    } conical;
    struct {
        Xgl_pt_f3d      center;
        float           radius;
        Xgl_boolean     norm_flag;
    } spherical;
} Xgl_nurbs_surf_geom_desc;

SunOS