CGAL::lower_envelope_xy_monotone_3

#include <CGAL/envelope_3.h>

template<class InputIterator, class Traits>
void	lower_envelope_xy_monotone_3 ( InputIterator begin, InputIterator end, Envelope_diagram_2<Traits>& diag)
		Computes the lower envelope of a set of $$xy-monotone surfaces in $$ 3, as given by the range [begin, end). The lower envelope is represented using the output minimization diagram diag. Precondition:  The value-type of InputIterator is Traits::Xy_monotone_surface_3.