Function

CGAL::x_extremal_point

#include <CGAL/global_functions_spherical_kernel_3.h>

Circular_arc_point_3<SphericalKernel>
x_extremal_point ( Sphere_3<SphericalKernel> c, bool b)
Returns the point on the sphere that is extremal in the x-direction, and that is the smallest (resp. largest) of the two x-extremal points for the lexicographic order if b is true (resp. false).

Circular_arc_point_3<SphericalKernel>
x_extremal_point ( Circle_3<SphericalKernel> c, bool b)
Same for a circle.
Precondition: The circle is not contained in a plane orthogonal to the x-axis.