diff --git a/EGkFrame3d.h b/EGkFrame3d.h
index b503fce..338b2c0 100644
--- a/EGkFrame3d.h
+++ b/EGkFrame3d.h
@@ -53,9 +53,9 @@ class EGK_EXPORT Frame3d
       bool ToGlob( const Frame3d& frRef) ;
       bool ToLoc( const Frame3d& frRef) ;
       bool LocToLoc( const Frame3d& frOri, const Frame3d& frDest) ;
-      const Frame3d& operator*=( const Frame3d& frRef)
+      Frame3d& operator*=( const Frame3d& frRef)
                { this->ToGlob( frRef) ; return *this ;}
-      const Frame3d& operator/=( const Frame3d& frRef)
+      Frame3d& operator/=( const Frame3d& frRef)
                { this->ToLoc( frRef) ; return *this ;}
       bool IsValid( void) const
                { return ( m_nType != ERR) ; }
@@ -94,7 +94,7 @@ const Frame3d GLOB_FRM ;
 //----------------------------------------------------------------------------
 // Prodotto di due frame (porta il primo dal secondo nel globale)
 //----------------------------------------------------------------------------
-inline const Frame3d 
+inline Frame3d 
 operator*( const Frame3d& frRef1, const Frame3d& frRef2)
 {
    Frame3d frRefR ;
@@ -109,7 +109,7 @@ operator*( const Frame3d& frRef1, const Frame3d& frRef2)
 //----------------------------------------------------------------------------
 // Divisione di due frame (porta il primo dal globale nel secondo)
 //----------------------------------------------------------------------------
-inline const Frame3d 
+inline Frame3d 
 operator/( const Frame3d& frRef1, const Frame3d& frRef2)
 {
    Frame3d frRefR ;
diff --git a/EGkPoint3d.h b/EGkPoint3d.h
index f1f582b..71cc72b 100644
--- a/EGkPoint3d.h
+++ b/EGkPoint3d.h
@@ -40,11 +40,6 @@ class EGK_EXPORT Point3d
       Point3d( void) : x( 0), y( 0), z( 0) {}
       //! Assegnazione delle componenti X, Y e Z al punto
       void Set( double dX, double dY, double dZ) { x = dX ; y = dY ; z = dZ ;}
-      //! Copia
-      const Point3d& operator =( const Point3d& ptSrc)
-                     { if ( &ptSrc != this) {
-                          x = ptSrc.x , y = ptSrc.y , z = ptSrc.z ; }
-                       return *this ; }
 
    public :
       //! Verifica se il punto è quasi l'origine
diff --git a/EGkVector3d.h b/EGkVector3d.h
index 6a30617..e882b6a 100644
--- a/EGkVector3d.h
+++ b/EGkVector3d.h
@@ -41,11 +41,6 @@ class EGK_EXPORT Vector3d
       Vector3d( void) : x( 0), y( 0), z( 0) {}
       //! Assegnazione delle componenti X, Y e Z al vettore
       void Set( double dX, double dY, double dZ) { x = dX ; y = dY ; z = dZ ; }
-      //! Copia
-      const Vector3d& operator =( const Vector3d& vtSrc)
-                         { if ( &vtSrc != this) {
-                              x = vtSrc.x , y = vtSrc.y , z = vtSrc.z ; }
-                           return *this ; }
 
    public :
       //! Quadrato della lunghezza del vettore
@@ -86,16 +81,16 @@ class EGK_EXPORT Vector3d
       bool IsZminus( void) const
              { return ( fabs( x) < EPS_ZERO  &&  fabs( y) < EPS_ZERO  &&  z < - EPS_ZERO) ; }
       //! Somma sul posto con altro vettore
-      const Vector3d& operator +=( const Vector3d& vtV)
+      Vector3d& operator +=( const Vector3d& vtV)
              { this->x += vtV.x ; this->y += vtV.y ; this->z += vtV.z ; return *this ; }
       //! Sottrazione sul posto con altro vettore
-      const Vector3d& operator -=( const Vector3d& vtV)
+      Vector3d& operator -=( const Vector3d& vtV)
              { this->x -= vtV.x ; this->y -= vtV.y ; this->z -= vtV.z ; return *this ; }
       //! Moltiplicazione sul posto con un numero
-      const Vector3d& operator *=( double dMul)
+      Vector3d& operator *=( double dMul)
              { this->x *= dMul ; this->y *= dMul ; this->z *= dMul ; return *this ; }
       //! Divisione sul posto con un numero
-      const Vector3d& operator /=( double dDiv)
+      Vector3d& operator /=( double dDiv)
              { double dMul = 1 / dDiv ; this->x *= dMul ; this->y *= dMul ; this->z *= dMul ; return *this ; }
       //! Ritorna la rappresentazione in coordinate sferiche
       void ToSpherical( double* pdLen, double* pdAngVertDeg, double* pdAngOrizzDeg) const ;
diff --git a/EGrScene.h b/EGrScene.h
index 55e967a..aad03cb 100644
--- a/EGrScene.h
+++ b/EGrScene.h
@@ -101,6 +101,8 @@ class IEGrScene
      // Snap
       virtual bool GetGraphicSnapPoint( int nSnap, const Point3d& ptWin, int nW, int nH, Point3d& ptSel) = 0 ;
       virtual bool GetGridSnapPointZ( bool bSketch, const Point3d& ptWin, const Point3d& ptGrid, Point3d& ptSel) = 0 ;
+      virtual int  GetLastSnapId( void) = 0 ;
+      virtual bool GetLastSnapDir( Vector3d& vtDir) = 0 ;
 } ;
 
 //-----------------------------------------------------------------------------
diff --git a/EInAPI.h b/EInAPI.h
index 095ef95..5f341aa 100644
--- a/EInAPI.h
+++ b/EInAPI.h
@@ -78,6 +78,8 @@ EIN_EXPORT BOOL __stdcall EgtPointLocToLoc( double* pdX, double* pdY, double* pd
                           const double ptO2[3], const double vtX2[3], const double vtY2[3], const double vtZ2[3]) ;
 EIN_EXPORT BOOL __stdcall EgtFrameFrom3Points( double ptO[3], double ptOnX[3], double ptNearY[3],
                           double ptOrig[3], double vtX[3], double vtY[3], double vtZ[3]) ;
+EIN_EXPORT BOOL __stdcall EgtFrameOCS( double ptO[3], double vtDirZ[3],
+                          double ptOrig[3], double vtX[3], double vtY[3], double vtZ[3]) ;
 EIN_EXPORT BOOL __stdcall EgtFrameTranslate( double ptOrig[3], double vtX[3], double vtY[3], double vtZ[3],
                           const double vtMove[3]) ;
 EIN_EXPORT BOOL __stdcall EgtFrameRotate( double ptOrig[3], double vtX[3], double vtY[3], double vtZ[3],
@@ -116,6 +118,7 @@ EIN_EXPORT int  __stdcall EgtCreateTextEx( int nParentId, const wchar_t* wsText,
 // GeomDB Create Curve
 EIN_EXPORT int  __stdcall EgtCreateCurveLine( int nParentId,
                                               const double ptIni[3], const double ptFin[3]) ;
+EIN_EXPORT int  __stdcall EgtCreateCurveLinePVL( int nParentId, const double ptIni[3], const double vtDir[3], double dLen) ;
 EIN_EXPORT int  __stdcall EgtCreateCurveLineMinPointCurve( int nParentId,
                                                            const double ptStart[3], int nCrvId, double dNearPar) ;
 EIN_EXPORT int  __stdcall EgtCreateCurveCircle( int nParentId,
@@ -136,6 +139,8 @@ EIN_EXPORT int  __stdcall EgtCreateCurveArc3P( int nParentId,
                                                const double ptP1[3], const double ptP2[3], const double ptP3[3]) ;
 EIN_EXPORT int  __stdcall EgtCreateCurveArcC2PN( int nParentId, const double ptCen[3],
                                                  const double ptStart[3], const double ptNearEnd[3], const double vtNorm[3]) ;
+EIN_EXPORT int  __stdcall EgtCreateCurveArc2PVN( int nParentId, const double ptStart[3],
+                                                 const double ptEnd[3], const double vtDirS[3], const double vtNorm[3]) ;
 EIN_EXPORT int  __stdcall EgtCreateCurveBezier( int nParentId, int nDegree,
                                                 const double ptCtrls[/*3x(nDegree+1)*/]) ;
 EIN_EXPORT int  __stdcall EgtCreateCurveBezierRational( int nParentId, int nDegree,
@@ -208,7 +213,9 @@ EIN_EXPORT BOOL __stdcall EgtGetName( int nId, wchar_t*& wsName) ;
 EIN_EXPORT BOOL __stdcall EgtExistsName( int nId) ;
 EIN_EXPORT BOOL __stdcall EgtRemoveName( int nId) ;
 EIN_EXPORT BOOL __stdcall EgtSetInfo( int nId, const wchar_t* wsKey, const wchar_t* wsInfo) ;
+EIN_EXPORT BOOL __stdcall EgtSetInfoInt( int nId, const wchar_t* wsKey, int nInfo) ;
 EIN_EXPORT BOOL __stdcall EgtGetInfo( int nId, const wchar_t* wsKey, wchar_t*& wsInfo) ;
+EIN_EXPORT BOOL __stdcall EgtGetInfoInt( int nId, const wchar_t* wsKey, int* pnInfo) ;
 EIN_EXPORT BOOL __stdcall EgtExistsInfo( int nId, const wchar_t* wsKey) ;
 EIN_EXPORT BOOL __stdcall EgtRemoveInfo( int nId, const wchar_t* wsKey) ;
 
@@ -257,6 +264,7 @@ EIN_EXPORT BOOL __stdcall EgtExtendCurveEndByLen( int nId, double dLen) ;
 EIN_EXPORT BOOL __stdcall EgtExtendCurveByLen( int nId, double dLen, const double ptNear[3]) ;
 EIN_EXPORT BOOL __stdcall EgtSplitCurveAtPoint( int nId, double ptOn[3]) ;
 EIN_EXPORT BOOL __stdcall EgtModifyCurveCircleCPN( int nId, const double ptOn[3]) ;
+EIN_EXPORT BOOL __stdcall EgtModifyCurveArcRadius( int nId, double dRad) ;
 EIN_EXPORT BOOL __stdcall EgtModifyCurveArcC2PN( int nId, const double ptEnd[3]) ;
 EIN_EXPORT BOOL __stdcall EgtModifyCurveArc3P( int nId, const double ptMid[3]) ;
 EIN_EXPORT BOOL __stdcall EgtSeparateCurveCompo( int nId) ;
@@ -275,10 +283,14 @@ EIN_EXPORT BOOL __stdcall EgtMidVector( int nId, double vtV[3]) ;
 EIN_EXPORT BOOL __stdcall EgtAtParamVector( int nId, double dU, int nSide, double vtV[3]) ;
 EIN_EXPORT BOOL __stdcall EgtFrame( int nId, double ptOrig[3],
                                     double vtX[3], double vtY[3], double vtZ[3]) ;
-EIN_EXPORT BOOL __stdcall EgtVectorToIdGlob( double vtV[3], int nId) ;
-EIN_EXPORT BOOL __stdcall EgtVectorToIdLoc( double vtV[3], int nId) ;
+EIN_EXPORT BOOL __stdcall EgtCurveExtrusion( int nId, double vtExtr[3]) ;
+EIN_EXPORT BOOL __stdcall EgtCurveThickness( int nId, double* pdThick) ;
+EIN_EXPORT BOOL __stdcall EgtCurveArcNormVersor( int nId, double vtNorm[3]) ;
+EIN_EXPORT BOOL __stdcall EgtExtTextNormVersor( int nId, double vtNorm[3]) ;
 EIN_EXPORT BOOL __stdcall EgtPointToIdGlob( double ptP[3], int nId) ;
 EIN_EXPORT BOOL __stdcall EgtPointToIdLoc( double ptP[3], int nId) ;
+EIN_EXPORT BOOL __stdcall EgtVectorToIdGlob( double vtV[3], int nId) ;
+EIN_EXPORT BOOL __stdcall EgtVectorToIdLoc( double vtV[3], int nId) ;
 
 // Geo Transform
 EIN_EXPORT BOOL __stdcall EgtMove( int nId, double vVtMove[3]) ;
@@ -328,6 +340,8 @@ EIN_EXPORT BOOL __stdcall EgtUnselectableRemove( int nId) ;
 EIN_EXPORT BOOL __stdcall EgtUnselectableClearAll( void) ;
 EIN_EXPORT BOOL __stdcall EgtGetGraphicSnapPoint( int nSnap, int nWinX, int nWinY, int nSelW, int nSelH, double ptP[3]) ;
 EIN_EXPORT BOOL __stdcall EgtGetGridSnapPointZ( BOOL bSketch, int nWinX, int nWinY, const double ptGrid[3], double ptP[3]) ;
+EIN_EXPORT int  __stdcall EgtGetLastSnapId( void) ;
+EIN_EXPORT BOOL __stdcall EgtGetLastSnapDir( double vtV[3]) ;
 EIN_EXPORT BOOL __stdcall EgtSetShowMode( int nShowMode, BOOL bRedraw) ;
 EIN_EXPORT int  __stdcall EgtGetShowMode( void) ;
 EIN_EXPORT BOOL __stdcall EgtSetShowCurveDirection( BOOL bShow, BOOL bRedraw) ;
diff --git a/EgkCurveArc.h b/EgkCurveArc.h
index 3d28b44..79ce119 100644
--- a/EgkCurveArc.h
+++ b/EgkCurveArc.h
@@ -28,6 +28,7 @@ class __declspec( novtable) ICurveArc : public ICurve
       virtual bool Set3P( const Point3d& ptStart, const Point3d& ptOther, const Point3d& ptEnd, bool bCirc = false) = 0 ;
       virtual bool Set2PNB( const Point3d& ptIni, const Point3d& ptFin, const Vector3d& vtN, double dBulge) = 0 ;
       virtual bool Set2PD( const Point3d& ptStart, const Point3d& ptEnd, double dDirStartDeg) = 0 ;
+      virtual bool Set2PVN( const Point3d& ptStart, const Point3d& ptEnd, const Vector3d& vtDirS, const Vector3d& vtN) = 0 ;
       virtual bool Set2PRS( const Point3d& ptStart, const Point3d& ptEnd, double dRad, bool bCCW = true) = 0 ;
       virtual bool Set2PNRS( const Point3d& ptStart, const Point3d& ptEnd, const Vector3d& vtN, double dRad, bool bCCW = true) = 0 ;
       virtual bool SetC2P( const Point3d& ptCen, const Point3d& ptStart, const Point3d& ptNearEnd) = 0 ;