#include	
#include	

#include "vector.h"

typedef struct vertex {
	Vector	p;
	Vector	n;
	double	fval;
} Vertex;

#define TRUE            -1
#define FALSE           0

#define MAX_REC 10
#define STEP_0  0.125

extern double eps_dist, dot_tol;

extern double f_value();
extern Vector f_ngrad();

extern int sign();

extern Vector project();