diff --git a/OffsetCurve.cpp b/OffsetCurve.cpp
index c4e0128..859e066 100644
--- a/OffsetCurve.cpp
+++ b/OffsetCurve.cpp
@@ -123,8 +123,8 @@ OffsetCurve::Make( const ICurve* pCrv, double dDist, int nType)
       return true ;
    }
 
-  // determino se necessario cambiare riferimento ( dal vettore estrusione)
-   bool bNeedRef = ( ! vtExtr.IsZplus()) ;
+  // determino se necessario cambiare riferimento ( dal vettore estrusione) e mai con Voronoi
+   bool bNeedRef = ( ! vtExtr.IsZplus()  &&  ! USE_VORONOI) ;
 
   // determino se necessario effettuare scalatura
    bool bNeedScale = ( abs( dExtrOnN) < cos( 0.1 * DEGTORAD)) ; 
diff --git a/StmFromCurves.cpp b/StmFromCurves.cpp
index c6385f2..d188e0e 100644
--- a/StmFromCurves.cpp
+++ b/StmFromCurves.cpp
@@ -346,8 +346,6 @@ GetSurfTriMeshSharpRectSwept( double dDimH, double dDimV, const ICurve* pGuide,
    PtrOwner<ICurve> pCrvL( OffsCrvL.GetLongerCurve()) ;
    if ( IsNull( pCrvL))
       return nullptr ;
-   PtrOwner<ICurve> pCrvRb ;
-   PtrOwner<ICurve> pCrvLb ;
   // costruisco le parti di superficie
    PtrOwner<ISurfTriMesh> pSrfTop( GetSurfTriMeshRuled( pCrvR, pCrvL, ISurfTriMesh::RLT_MINDIST, dLinTol)) ;
    if ( IsNull( pSrfTop))
diff --git a/Voronoi.h b/Voronoi.h
index 180520d..7311055 100644
--- a/Voronoi.h
+++ b/Voronoi.h
@@ -22,7 +22,7 @@
 #include "/EgtDev/Extern/vroni/Include/vroni_object.h"
 
 //----------------------------------------------------------------------------
-static const bool USE_VORONOI = false ;
+static const bool USE_VORONOI = true ;
 static const int VORONOI_STD_BOUND = 3 ;
 static const double VRONI_OFFS_TOL = 1e-14 ;