#ifndef WH_3D_H_bbe66f11_
#define WH_3D_H_bbe66f11_

typedef struct pt3 PT3;
typedef struct xform XFORM;

struct pt3 {
  double x;
  double y;
  double z;
  } ;

struct xform {
  double m[4][3];
  } ;

extern PT3 add3(PT3, PT3);
extern PT3 sub3(PT3, PT3);
extern PT3 unit3(PT3);
extern double norm3(PT3);
extern double dot3(PT3, PT3);
extern PT3 cross3(PT3, PT3);
extern PT3 scale3(PT3, double);
extern double dist3(PT3, PT3);
extern XFORM find_transform(PT3, PT3, PT3);
extern XFORM transform_identity(void);
extern PT3 transform(PT3, XFORM);

#endif