inline G4Point3D G4Ray::GetPoint(G4double i) const {
  return start+i*dir;
}

inline G4double G4Ray::GetPPoint(const G4Point3D& p) const {
  // |dir|==1
  return (p-start)*dir;
}

inline const G4Vector3D& G4Ray::GetDir() const {
  return dir;
}

inline const G4Point3D& G4Ray::GetStart() const {
  return start;
}

inline void G4Ray::SetDir(const G4Vector3D& dir0) {
  dir= dir0.unit();
}

inline void G4Ray::SetStart(const G4Point3D& start0) {
  start= start0;
}

inline void G4Ray::Init(const G4Point3D& start0, const G4Vector3D& dir0)
{
  start= start0;
  dir=   dir0;
  RayCheck();
  CreatePlanes();
}

inline G4Ray::G4Ray(const G4Point3D& start0, const G4Vector3D& dir0) {
  Init(start0, dir0);
}

inline G4Ray::G4Ray()
{
}