extern short int fcuad(double a, double b, double c, double *x1, double *x2 );
extern short int ffsen(double a,double b,double *ang1, double *ang2 );
extern short int fesf(Point3D vi,Point3D vj,Point3D vk,Point3D vl);
extern short int falfa( double delta , double *alfa );
extern double GetAlfa( double delta );
extern void MakeAlfa( void );

#define sgn(a) (Float)((a>=0)?((a>0)?1:0):-1)

#define TOL 5e-3

#define	NO_ERR		0x0000

#define FCUAD_DNEG	0x0101 /* -1 */
#define FCUAD_ANUL	0x0102

#define FFSEN_ABNUL	0x0201
#define FFSEN_DNEG	0x0202

#define	FESF_ZZNUL	0x0301	/* -1 */
#define	FESF_EQYNEG	0x0302	/* -2 */
#define FESF_NOSOL	0x0303	/* -3 */
#define FESF_XXNEG	0x0304	/* -12 */

#define	NO_ALFA		0x0401	/* -1 */
#define	ALFA_NEG	0x0402	/* -2 */