diff --git a/EGkCAvToolSurfTm.h b/EGkCAvToolSurfTm.h
index 0a7a43f..60d7339 100644
--- a/EGkCAvToolSurfTm.h
+++ b/EGkCAvToolSurfTm.h
@@ -38,7 +38,8 @@ class __declspec( novtable) ICAvToolSurfTm {
       virtual double GetToolRadius( void) const = 0 ;
       virtual double GetToolHeight( void) const = 0 ;
       virtual const ICurveComposite& GetToolOutline( bool bApprox = false) const = 0 ;
-      virtual bool TestPosition( const Point3d& ptT, const Vector3d& vtDir, const Vector3d& vtMove, double& dTotDist) const = 0 ;
+      virtual bool TestPosition( const Point3d& ptT, const Vector3d& vtDir, const Vector3d& vtMove,
+                                 double& dTotDist, Vector3d* pvtTriaN = nullptr) const = 0 ;
       virtual bool TestSeries( PNTUVECTOR& vPntM, const Vector3d& vtDir, const Vector3d& vtMove, double dProgCoeff = 1) = 0 ;
       virtual bool TestPath( PNTULIST& lPntM, const Vector3d& vtDir, const Vector3d& vtMove, double dLinTol, double dProgCoeff = 1) = 0 ;
 } ;
diff --git a/EGkCurveAux.h b/EGkCurveAux.h
index b23067b..91b6506 100644
--- a/EGkCurveAux.h
+++ b/EGkCurveAux.h
@@ -121,6 +121,10 @@ EGK_EXPORT bool CalcCurveMedialAxis( const ICurve& crvC, ICURVEPOVECTOR& vCrvs,
 //! Calcola l'offset completo di una curva
 EGK_EXPORT bool CalcCurveFatCurve( const ICurve& crvC, ICURVEPOVECTOR& vCrvs, double dRadius, bool bSquareEnds, bool bSquareMids) ;
 
+//----------------------------------------------------------------------------
+//! Calcola, nel caso di curve chiuse, il valore limite di offset ( in valore assoluto) che fa sparire la curva
+EGK_EXPORT bool CalcCurveLimitOffset( const ICurve& crvC, double& dOffs) ;
+
 //----------------------------------------------------------------------------
 //! Resetta l'oggetto voronoi associato alla curva liberandone la memoria
 EGK_EXPORT void ResetCurveVoronoi( const ICurve& crvC) ;
\ No newline at end of file
diff --git a/EGkSurfFlatRegion.h b/EGkSurfFlatRegion.h
index eee5e43..276ce89 100644
--- a/EGkSurfFlatRegion.h
+++ b/EGkSurfFlatRegion.h
@@ -51,6 +51,8 @@ class __declspec( novtable) ISurfFlatRegion : public ISurf
       virtual int  GetChunkSimpleClassification( int nChunk, const ISurfFlatRegion& Other, int nOthChunk) const ;   // compare only outsides
       virtual bool CalcVoronoiDiagram( ICURVEPOVECTOR& vCrvs, int nBound = 3) const = 0 ;
       virtual bool CalcMedialAxis( ICURVEPOVECTOR& vCrvs, int nSide = 1) const = 0 ;
+      virtual bool GetChunkMaxOffset( int nChunk, double& dOffs) const = 0 ;
+      virtual bool GetMaxOffset( double& dOffs) const = 0 ;
       virtual void ResetVoronoiObject( void) const = 0 ;
       virtual bool SetCurveTempProp( int nChunk, int nLoop, int nCrv, int nProp, int nPropInd = 0) = 0 ;
       virtual bool GetCurveTempProp( int nChunk, int nLoop, int nCrv, int& nProp, int nPropInd = 0) const = 0 ;
diff --git a/EXeExecutor.h b/EXeExecutor.h
index 1cef3e4..1ce9869 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -710,6 +710,7 @@ EXE_EXPORT int ExeSurfFrGetZigZagInfill( int nId, int nDestGrpId, double dStep,
 // GeomDb Curve Get
 EXE_EXPORT bool ExeCurveDomain( int nId, double* pdStart, double* pdEnd) ;
 EXE_EXPORT bool ExeCurveLength( int nId, double* pdLen) ;
+EXE_EXPORT bool ExeCurveLengthAtParam( int nId, double dPar, double* pdLen) ;
 EXE_EXPORT bool ExeCurveParamAtLength( int nId, double dLen, double* pdPar) ;
 EXE_EXPORT bool ExeCurveParamAtPoint( int nId, const Point3d& pt, double dTol, int nRefType, double* pdPar) ;
 EXE_EXPORT bool ExeCurveLengthAtPoint( int nId, const Point3d& ptOn, double dExtend, double* pdLen) ;