TGeoGtra

    public:

                         TGeoGtra()
                         TGeoGtra(Double_t dz, Double_t theta, Double_t phi, Double_t twist, Double_t h1, Double_t bl1, Double_t tl1, Double_t alpha1, Double_t h2, Double_t bl2, Double_t tl2, Double_t alpha2)
                         TGeoGtra(const char* name, Double_t dz, Double_t theta, Double_t phi, Double_t twist, Double_t h1, Double_t bl1, Double_t tl1, Double_t alpha1, Double_t h2, Double_t bl2, Double_t tl2, Double_t alpha2)
                         TGeoGtra(const TGeoGtra&)
                 virtual ~TGeoGtra()
          static TClass* Class()
        virtual Double_t DistFromInside(Double_t* point, Double_t* dir, Int_t iact = 1, Double_t step = TGeoShape::Big(), Double_t* safe = 0) const
        virtual Double_t DistFromOutside(Double_t* point, Double_t* dir, Int_t iact = 1, Double_t step = TGeoShape::Big(), Double_t* safe = 0) const
      virtual TGeoShape* GetMakeRuntimeShape(TGeoShape* mother, TGeoMatrix* mat) const
           virtual Int_t GetNmeshVertices() const
                Double_t GetTwistAngle() const
         virtual TClass* IsA() const
            virtual void SavePrimitive(ostream& out, Option_t* option = "")
            virtual void SetDimensions(Double_t* param)
            virtual void ShowMembers(TMemberInspector& insp, char* parent)
            virtual void Streamer(TBuffer& b)
                    void StreamerNVirtual(TBuffer& b)

    protected:

      Double_t fTwistAngle  twist angle in degrees

Class Description

________________________________________________________________________
 TGeoArb8 - a arbitrary trapezoid with less than 8 vertices standing on
   two paralel planes perpendicular to Z axis. Parameters :
            - dz - half length in Z;
            - xy[8][2] - vector of (x,y) coordinates of vertices
               - first four points (xy[i][j], i<4, j<2) are the (x,y)
                 coordinates of the vertices sitting on the -dz plane;
               - last four points (xy[i][j], i>=4, j<2) are the (x,y)
                 coordinates of the vertices sitting on the +dz plane;
   The order of defining the vertices of an arb8 is the following :
      - point 0 is connected with points 1,3,4
      - point 1 is connected with points 0,2,5
      - point 2 is connected with points 1,3,6
      - point 3 is connected with points 0,2,7
      - point 4 is connected with points 0,5,7
      - point 5 is connected with points 1,4,6
      - point 6 is connected with points 2,5,7
      - point 7 is connected with points 3,4,6
   Points can be identical in order to create shapes with less than
   8 vertices.

 Default ctor

 Constructor.

 Constructor providing the name of the shape.

 Destructor.

 Compute distance from inside point to surface of the shape.

 Compute distance from inside point to surface of the shape.

 Save a primitive as a C++ statement(s) on output stream "out".

 Set all arb8 params in one step.
 param[0] = dz
 param[1] = theta
 param[2] = phi
 param[3] = h1
 param[4] = bl1
 param[5] = tl1
 param[6] = alpha1
 param[7] = h2
 param[8] = bl2
 param[9] = tl2
 param[10] = alpha2
 param[11] = twist

 constructors