#ifndef TG3Plane_hh
#define TG3Plane_hh

#include "TVector3.h"

class TLine3D;

class TG3Plane: public TObject {
//-----------------------------------------------------------------------------
// data members
//-----------------------------------------------------------------------------
protected:
  TVector3  fR0;			// point in a plane 
  TVector3  fNormal;			// normal to the plane
//-----------------------------------------------------------------------------
// functions
//-----------------------------------------------------------------------------
public:
					// ****** constructors and destructor
  TG3Plane();
  TG3Plane(const TVector3& R0, const TVector3& Normal);
  virtual ~TG3Plane();
					// ****** accessors

  TVector3& GetR0    () { return fR0;     }
  TVector3& GetNormal() { return fNormal; }

					// ****** less trivial methods

					// returns 3D point where line
					// intersects *this plane

  Int_t     FindIntersection(const TLine3D& Line, TVector3& Point);

  ClassDef(TG3Plane,1)			// plane in 3D
};
#endif