diff --git a/EGkVector3d.h b/EGkVector3d.h
index f51f0f1..0c9bf54 100644
--- a/EGkVector3d.h
+++ b/EGkVector3d.h
@@ -149,7 +149,9 @@ class EGK_EXPORT Vector3d
       bool GetAngleXY( const Vector3d& vtEnd, double& dAngDeg) const ;
       //! \brief Calcolo angolo di rotazione per portare la componente del vettore perpendicolare
       //! all'asse di rotazione sulla stessa direzione della componente perpendicolare di vtEnd
-      bool GetRotation( const Vector3d& vtEnd, const Vector3d& vtAx, double& dAngDeg, bool& bDet) const ;
+      bool GetRotation( const Vector3d& vtEnd, const Vector3d& vtAx, double dEpsZero, double& dAngDeg, bool& bDet) const ;
+      bool GetRotation( const Vector3d& vtEnd, const Vector3d& vtAx, double& dAngDeg, bool& bDet) const
+               { return GetRotation( vtEnd, vtAx, EPS_ZERO, dAngDeg, bDet) ;}
 
    public :
       union {