diff --git a/WaterJetting.cpp b/WaterJetting.cpp
index bd9a9cb..acc7688 100644
--- a/WaterJetting.cpp
+++ b/WaterJetting.cpp
@@ -1753,7 +1753,7 @@ WaterJetting::ProcessPath( int nPathId, int nPvId, int nClId)
       AdjustPathForInternalAngles( pCompo) ;
 
      // creo l'anteprima del percorso
-      if ( ! GeneratePreView( nPxId, pCompo, dAddedOverlap))
+      if ( ! GeneratePreView( nPxId, pCompo, vtTool, dAddedOverlap))
          return false ;
    }
 
@@ -1793,7 +1793,7 @@ WaterJetting::ProcessPath( int nPathId, int nPvId, int nClId)
 
 //----------------------------------------------------------------------------
 bool
-WaterJetting::GeneratePreView( int nPathId, const ICurveComposite* pCompo, double dAddedOverlap)
+WaterJetting::GeneratePreView( int nPathId, const ICurveComposite* pCompo, const Vector3d& vtTool, double dAddedOverlap)
 {
   // colore taglio, dipendente da angolo di inclinazione
    Color colCut = TEAL ;
@@ -1832,7 +1832,7 @@ WaterJetting::GeneratePreView( int nPathId, const ICurveComposite* pCompo, doubl
    m_pGeomDB->SetMaterial( nRRId, INVISIBLE) ;
  
   // regione per attacco
-   PtrOwner<ISurfFlatRegion> pSfrLI( GenerateLeadInPreview( pCompo, bClosed)) ;
+   PtrOwner<ISurfFlatRegion> pSfrLI( GenerateLeadInPreview( pCompo, vtTool, bClosed)) ;
    if ( IsNull( pSfrLI))
       return false ;
    if ( pSfrLI->IsValid()) {    
@@ -1863,7 +1863,7 @@ WaterJetting::GeneratePreView( int nPathId, const ICurveComposite* pCompo, doubl
    }
 
   // regione per uscita
-   PtrOwner<ISurfFlatRegion> pSfrLO( GenerateLeadOutPreview( pCompo)) ;
+   PtrOwner<ISurfFlatRegion> pSfrLO( GenerateLeadOutPreview( pCompo, vtTool)) ;
    if ( IsNull( pSfrLO))
       return false ;
    if ( pSfrLO->IsValid()) {
@@ -2024,7 +2024,7 @@ WaterJetting::GeneratePreView( int nPathId, const ICurveComposite* pCompo, doubl
 
 //----------------------------------------------------------------------------
 ISurfFlatRegion*
-WaterJetting::GenerateLeadInPreview( const ICurveComposite* pCompo, bool bClosed)
+WaterJetting::GenerateLeadInPreview( const ICurveComposite* pCompo, const Vector3d& vtN, bool bClosed)
 {
   // Creo la superficie
    PtrOwner<ISurfFlatRegion> pSfr( CreateSurfFlatRegion()) ;
@@ -2037,8 +2037,6 @@ WaterJetting::GenerateLeadInPreview( const ICurveComposite* pCompo, bool bClosed
   // Recupero punto e direzione iniziali del percorso
    Point3d ptStart ; pCompo->GetStartPoint( ptStart) ;
    Vector3d vtStart ; pCompo->GetStartDir( vtStart) ;
-  // Recupero versore estrusione
-   Vector3d vtN ; pCompo->GetExtrusion( vtN) ;
 
   // Verifico il tipo
    int nType = GetLeadInType() ;
@@ -2091,7 +2089,7 @@ WaterJetting::GenerateLeadInPreview( const ICurveComposite* pCompo, bool bClosed
 
 //----------------------------------------------------------------------------
 ISurfFlatRegion*
-WaterJetting::GenerateLeadOutPreview( const ICurveComposite* pCompo)
+WaterJetting::GenerateLeadOutPreview( const ICurveComposite* pCompo, const Vector3d& vtN)
 {
   // Creo la regione
    PtrOwner<ISurfFlatRegion> pSfr( CreateSurfFlatRegion()) ;
@@ -2121,8 +2119,6 @@ WaterJetting::GenerateLeadOutPreview( const ICurveComposite* pCompo)
   // Recupero punto e direzione iniziali del percorso
    Point3d ptEnd ; pCompo->GetEndPoint( ptEnd) ;
    Vector3d vtEnd ; pCompo->GetEndDir( vtEnd) ;
-  // Recupero versore estrusione
-   Vector3d vtN ; pCompo->GetExtrusion( vtN) ;
   // Calcolo la curva di uscita
    PtrOwner<ICurve> pCrv ;
    switch ( nType) {
@@ -2329,9 +2325,6 @@ WaterJetting::AddStandardWj( const ICurveComposite* pCompo, const Vector3d& vtTo
   // recupero distanze di sicurezza
    double dSafeZ = GetSafeZ() ;
 
-  // Recupero versore estrusione
-   Vector3d vtN ; pCompo->GetExtrusion( vtN) ;
-
   // verifico se la curva è chiusa a meno di eventuale dAddedOverlap
    bool bClosed = ( pCompo->IsClosed()  ||  dAddedOverlap > EPS_SMALL) ;
 
@@ -2413,7 +2406,7 @@ WaterJetting::AddStandardWj( const ICurveComposite* pCompo, const Vector3d& vtTo
 
            // anello
             bool bLoopOk = true ;
-            PtrOwner<ICurve> pCrvA( GetArc2PVN( ptPe, ptPs, vtEnd, vtN)) ;
+            PtrOwner<ICurve> pCrvA( GetArc2PVN( ptPe, ptPs, vtEnd, vtTool)) ;
             if ( ! IsNull( pCrvA)  &&  pCrvA->GetType() == CRV_ARC) {
               // verifico che l'anello non interferisca con la curva di lavoro
                IntersCurveCurve intAC( *pCrvA, *pCompo) ;
diff --git a/WaterJetting.h b/WaterJetting.h
index 4f6dca3..a9922c6 100644
--- a/WaterJetting.h
+++ b/WaterJetting.h
@@ -82,9 +82,9 @@ class WaterJetting : public Machining
       bool VerifySideAngle( void) ;
       bool ProcessPath( int nPathId, int nPvId, int nClId) ;
       bool AdjustPathForInternalAngles( ICurveComposite* pCompo) ;
-      bool GeneratePreView( int nPathId, const ICurveComposite* pCompo, double dAddedOverlap) ;
-      ISurfFlatRegion* GenerateLeadInPreview( const ICurveComposite* pCompo, bool bClosed) ;
-      ISurfFlatRegion* GenerateLeadOutPreview( const ICurveComposite* pCompo) ;
+      bool GeneratePreView( int nPathId, const ICurveComposite* pCompo, const Vector3d& vtTool, double dAddedOverlap) ;
+      ISurfFlatRegion* GenerateLeadInPreview( const ICurveComposite* pCompo, const Vector3d& vtN, bool bClosed) ;
+      ISurfFlatRegion* GenerateLeadOutPreview( const ICurveComposite* pCompo, const Vector3d& vtN) ;
       bool AddLoopsPreview( const ICurveComposite* pCompo, ISurfFlatRegion* pSPV) ;
       bool AddStandardWj( const ICurveComposite* pCompo, const Vector3d& vtTool, bool bSplitArcs, double dAddedOverlap) ;
       bool AddApproach( const Point3d& ptP, const Vector3d& vtTool, double dSafeZ, bool bSplit) ;