diff --git a/EgtMachKernel.rc b/EgtMachKernel.rc
index cdab733..f7e27c7 100644
Binary files a/EgtMachKernel.rc and b/EgtMachKernel.rc differ
diff --git a/WaterJetting.cpp b/WaterJetting.cpp
index 907edfe..e469ef9 100644
--- a/WaterJetting.cpp
+++ b/WaterJetting.cpp
@@ -2762,8 +2762,15 @@ WaterJetting::CalcCorrDir( const ICurveComposite* pCompo, double dU)
 bool
 WaterJetting::CalcOffset( ICurveComposite* pCompo, double dSignOffs)
 {
+  // determino opzioni di offset
+   int nFlag = ICurve::OFF_EXTEND ;
+   if ( pCompo->IsClosed()) {
+      Vector3d vtStart ; pCompo->GetStartDir( vtStart) ;
+      Vector3d vtEnd ; pCompo->GetEndDir( vtEnd) ;
+      if ( ! AreSameVectorEpsilon( vtStart, vtEnd, sin( 5 * DEGTORAD)))
+         nFlag |= ICurve::OFF_FORCE_OPEN ;
+   }
   // eseguo offset semplice
-   int nFlag = ICurve::OFF_EXTEND | ICurve::OFF_FORCE_OPEN ;
    if ( pCompo->SimpleOffset( dSignOffs, nFlag))
       return true ;
   // se curva piatta, provo con offset avanzato