diff --git a/SurfTriMesh.cpp b/SurfTriMesh.cpp
index e3a99f0..1e45dc8 100644
--- a/SurfTriMesh.cpp
+++ b/SurfTriMesh.cpp
@@ -26,6 +26,7 @@
 #include "/EgtDev/Include/EGkDistLineLine.h"
 #include "/EgtDev/Include/EGkIntersLinePlane.h"
 #include "/EgtDev/Include/EGkPointGrid3d.h"
+#include "/EgtDev/Include/EGkPolygon3d.h"
 #include "/EgtDev/Include/EGkPolyLine.h"
 #include "/EgtDev/Include/EGkStringUtils3d.h"
 #include "/EgtDev/Include/EGkUiUnits.h"
@@ -1177,6 +1178,78 @@ SurfTriMesh::GetSilhouette( const Vector3d& vtDir, double dTol, POLYLINEVECTOR&
    return true ;
 }
 
+//----------------------------------------------------------------------------
+bool
+SurfTriMesh::GetSilhouette( const Plane3d& plPlane, double dTol, POLYLINEVECTOR& vPL, bool bAllTria) const
+{
+  // Verifico lo stato
+   if ( m_nStatus != OK)
+      return false ;
+
+  // Verifico la direzione
+   Vector3d vtVers = plPlane.GetVersN() ;
+   if ( ! vtVers.Normalize())
+      return false ;
+
+  // Controlli su tolleranza
+   dTol = max( dTol, 100 * EPS_SMALL) ;
+
+  // Determino il riferimento di proiezione
+   Frame3d frOCS ; frOCS.Set( plPlane.GetPoint(), vtVers) ;
+
+  // Ottengo la Silhouette come unione delle regioni dei triangoli proiettati (solo parti sopra il piano)
+  // calcolo la regione dei triangoli proiettati
+   PtrOwner<SurfFlatRegion> pSfr ;
+   Triangle3d Tria ;
+   int nT = GetFirstTriangle( Tria) ;
+   while ( nT != SVT_NULL) {
+     // verifico la normale
+      if ( ( bAllTria  &&  abs( Tria.GetN() * vtVers) > EPS_ZERO)  ||
+           ( ! bAllTria  &&  Tria.GetN() * vtVers > EPS_ZERO)) {
+        // ricavo il poligono equivalente al triangolo
+         Polygon3d pgTria ;
+         pgTria.FromTriangle( Tria) ;
+        // taglio il poligono con il piano
+         pgTria.Trim( plPlane, false, true, bAllTria) ;
+        // se rimasto qualcosa
+         if ( pgTria.GetSideCount() > 0) {
+           // lo proietto sul piano e creo la regione
+            pgTria.Scale( frOCS, 1, 1, 0) ;
+            PtrOwner<SurfFlatRegion> pSfrTria( GetBasicSurfFlatRegion( GetSurfFlatRegionFromPolyLine( pgTria.GetPolyLine()))) ;
+            if ( ! IsNull( pSfrTria)) {
+               if ( bAllTria  &&  Tria.GetN() * vtVers < 0)
+                  pSfrTria->Invert() ;
+               pSfrTria->Offset( dTol, ICurve::OFF_FILLET) ;
+               if ( IsNull( pSfr))
+                  pSfr.Set( pSfrTria) ;
+               else
+                  pSfr->Add( *pSfrTria) ;
+            }
+         }
+      }
+     // passo al successivo
+      nT = GetNextTriangle( nT, Tria) ;
+   }
+
+  // Se non esiste la regione
+   if ( IsNull( pSfr))
+      return false ;
+
+  // Effettuo contro-offset
+   pSfr->Offset( -dTol, ICurve::OFF_EXTEND) ;
+
+  // Recupero i contorni della regione
+   for ( int i = 0 ; i < pSfr->GetChunkCount() ; ++ i) {
+      for ( int j = 0 ; j < pSfr->GetLoopCount( i) ; ++ j) {
+         PolyLine PL ;
+         if ( pSfr->ApproxLoopWithLines( i, j, LIN_TOL_STD, ANG_TOL_STD_DEG, ICurve::APL_STD, PL))
+            vPL.emplace_back( PL) ;
+      }
+   }
+
+   return true ;
+}
+
 //----------------------------------------------------------------------------
 SurfTriMesh*
 SurfTriMesh::Clone( void) const
diff --git a/SurfTriMesh.h b/SurfTriMesh.h
index fe80811..c7eb88f 100644
--- a/SurfTriMesh.h
+++ b/SurfTriMesh.h
@@ -279,6 +279,7 @@ class SurfTriMesh : public ISurfTriMesh, public IGeoObjRW
       SurfTriMesh* CloneTriangle( int nT) const override ;
       bool GetLoops( POLYLINEVECTOR& vPL) const override ;
       bool GetSilhouette( const Vector3d& vtDir, double dTol, POLYLINEVECTOR& vPL, bool bAllTria = false) const override ;
+      bool GetSilhouette( const Plane3d& plPlane, double dTol, POLYLINEVECTOR& vPL, bool bAllTria = false) const override ;
       int  GetFacetCount( void) const override ;
       int  GetFacetSize( void) const override
               { return int( m_vFacet.size()) ; }