diff --git a/EGkCAvSilhouetteSurfTm.h b/EGkCAvSilhouetteSurfTm.h
index 48381ee..6168150 100644
--- a/EGkCAvSilhouetteSurfTm.h
+++ b/EGkCAvSilhouetteSurfTm.h
@@ -31,8 +31,14 @@ class __declspec( novtable) ICAvParSilhouettesSurfTm
 {
    public :
       virtual ~ICAvParSilhouettesSurfTm( void) {}
+     // generica
       virtual bool SetData( const CISURFTMPVECTOR& vpStm, const Frame3d& frPlanes, double dTol) = 0 ;
       virtual bool GetSilhouette( double dLevel, POLYLINEVECTOR& vPL) = 0 ;
+     // con regione piana
+      virtual bool SetDataForRegion( const CISURFTMPVECTOR& vpStm, const ISurfFlatRegion* pSfr, double dSideAng,
+                                     double dDiam, double dCornRad, double dMaxMat, double dOffsR,
+                                     double dSampleTol = 10 * EPS_SMALL, double dSharpedAngTol = 15.) = 0 ;
+      virtual bool GetSilhouetteInsideRegion( double dLevel, POLYLINEVECTOR& vPL) = 0 ;
 } ;
 
 //-----------------------------------------------------------------------------
diff --git a/EGkCAvToolSurfTm.h b/EGkCAvToolSurfTm.h
index 60d7339..c3a4ee7 100644
--- a/EGkCAvToolSurfTm.h
+++ b/EGkCAvToolSurfTm.h
@@ -37,6 +37,9 @@ class __declspec( novtable) ICAvToolSurfTm {
       virtual bool SetGenTool( const ICurveComposite* pToolOutline) = 0 ;
       virtual double GetToolRadius( void) const = 0 ;
       virtual double GetToolHeight( void) const = 0 ;
+      virtual double GetToolTipHeight( void) const = 0 ;
+      virtual double GetToolTipRadius( void) const = 0 ;
+      virtual double GetToolCornRadius( 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, Vector3d* pvtTriaN = nullptr) const = 0 ;