diff --git a/VolZmapGraphics.cpp b/VolZmapGraphics.cpp
index 456d740..22c28db 100644
--- a/VolZmapGraphics.cpp
+++ b/VolZmapGraphics.cpp
@@ -1648,7 +1648,7 @@ VolZmap::ExtMarchingCubes( int nBlock, TRIA3DEXLIST& lstTria, TriHolder& triHold
    for ( int i = nLimits[0] ; i < nLimits[1] ; ++ i) {
       for ( int j = nLimits[2] ; j < nLimits[3] ; ++ j) {
          for ( int k = nLimits[4] ; k < nLimits[5] ; ++ k) {
-
+         
            // Classificazione dei vertici: interni o esterni al materiale 
             int nIndex = CalcIndex( i, j, k) ;
 
@@ -1996,7 +1996,7 @@ VolZmap::ExtMarchingCubes( int nBlock, TRIA3DEXLIST& lstTria, TriHolder& triHold
 
                  // Caso generale
                   for ( int ni = 0 ; ni < nVertComp[nCompCount - 1] ; ++ ni) {
-                     dMatrixN( ni, 0) = vtNorm[ni].x ;
+                     dMatrixN( ni, 0) = vtNorm[ni].x ; 
                      dMatrixN( ni, 1) = vtNorm[ni].y ;
                      dMatrixN( ni, 2) = vtNorm[ni].z ;
                      dKnownVector( ni) = vtNorm[ni] * vtTrasf[ni] ;
@@ -2153,6 +2153,8 @@ VolZmap::ExtMarchingCubes( int nBlock, TRIA3DEXLIST& lstTria, TriHolder& triHold
                                        CurrentTriangle.Set( ptSol, CompoVert[nCompCount - 1][nj].ptInt, CompoVert[nCompCount - 1][ni].ptInt) ;
                                        CurrentTriangle.SetAttrib( 1, CompoVert[nCompCount - 1][nj].nToolFlag) ;
                                        CurrentTriangle.SetAttrib( 2, CompoVert[nCompCount - 1][ni].nToolFlag) ;
+                                       CurrentTriangle.SetVertexNorm( 1, CompoVert[nCompCount - 1][nj].vtNorm) ;
+                                       CurrentTriangle.SetVertexNorm( 2, CompoVert[nCompCount - 1][ni].vtNorm) ;
                                        if ( CurrentTriangle.GetAttrib( 1) < 0  ||
                                             CurrentTriangle.GetAttrib( 2) < 0)
                                           CurrentTriangle.SetGrade( - 1) ;
@@ -2235,6 +2237,8 @@ VolZmap::ExtMarchingCubes( int nBlock, TRIA3DEXLIST& lstTria, TriHolder& triHold
                                  CurrentTriangle.Set( ptSol, CompoVert[nCompCount - 1][nj].ptInt, CompoVert[nCompCount - 1][ni].ptInt) ;
                                  CurrentTriangle.SetAttrib( 1, CompoVert[nCompCount - 1][nj].nToolFlag) ;
                                  CurrentTriangle.SetAttrib( 2, CompoVert[nCompCount - 1][ni].nToolFlag) ;
+                                 CurrentTriangle.SetVertexNorm( 1, CompoVert[nCompCount - 1][nj].vtNorm) ;
+                                 CurrentTriangle.SetVertexNorm( 2, CompoVert[nCompCount - 1][ni].vtNorm) ;
                                  if ( CurrentTriangle.GetAttrib( 1) < 0  ||
                                        CurrentTriangle.GetAttrib( 2) < 0)
                                     CurrentTriangle.SetGrade( - 1) ;
@@ -2409,7 +2413,7 @@ VolZmap::ExtMarchingCubes( int nBlock, TRIA3DEXLIST& lstTria, TriHolder& triHold
                         if ( CurrentTriangle.Validate( true)) {
                            for ( int nV = 0 ; nV < 3 ; ++ nV) {
                               const Vector3d& vtVertNorm = CompoTriVert[nCompCount - 1][TriIndex+nV].vtNorm ;
-                              if ( CurrentTriangle.GetN() * vtVertNorm > 0.5) 
+                              if ( CurrentTriangle.GetN() * vtVertNorm > 0.6) 
                                  CurrentTriangle.SetVertexNorm( nV, vtVertNorm) ;
                               else
                                  CurrentTriangle.SetVertexNorm( nV, CurrentTriangle.GetN()) ;
@@ -2459,7 +2463,7 @@ VolZmap::ExtMarchingCubes( int nBlock, TRIA3DEXLIST& lstTria, TriHolder& triHold
                      if ( CurrentTriangle.Validate( true)) {
                         for ( int nV = 0 ; nV < 3 ; ++ nV) {
                            const Vector3d& vtVertNorm = CompoTriVert[nCompCount - 1][TriIndex+nV].vtNorm ;
-                           if ( CurrentTriangle.GetN() * vtVertNorm > 0.5) 
+                           if ( CurrentTriangle.GetN() * vtVertNorm > 0.6) 
                               CurrentTriangle.SetVertexNorm( nV, vtVertNorm) ;
                            else
                               CurrentTriangle.SetVertexNorm( nV, CurrentTriangle.GetN()) ;
@@ -2692,10 +2696,11 @@ VolZmap::FlipEdgesII( TriHolder& TriHold) const
                                  TriHold[n2].vCompoTria[nCompo2][nTri2].SetGrade( nCol2) ;
                                 // Valido i triangoli
                                  TriHold[n1].vCompoTria[nCompo1][nTri1].Validate( true) ;
-                                 TriHold[n2].vCompoTria[nCompo2][nTri2].Validate( true) ;
+                                 TriHold[n2].vCompoTria[nCompo2][nTri2].Validate( true) ;                               
                                 // Setto le normali a ogni vertice
-                                 Vector3d vtNorm1 = TriHold[n1].vCompoTria[nCompo1][nTri1].GetN() ;
-                                 Vector3d vtNorm2 = TriHold[n2].vCompoTria[nCompo2][nTri2].GetN() ;
+                                 Vector3d vtNorm1 = TriHold[n1].vCompoTria[nCompo1][nTri1].GetVertexNorm( SharedIndex[2]) ;
+                                 Vector3d vtNorm2 = TriHold[n2].vCompoTria[nCompo2][nTri2].GetVertexNorm( SharedIndex[1]) ;
+                                                                
                                  int nFeatureIndex1 = 0 ;
                                  int nFeatureIndex2 = 0 ;
                                  for ( ; nFeatureIndex1 < 3  &&  nFeatureIndex2 < 3 ; ) {
@@ -2712,6 +2717,7 @@ VolZmap::FlipEdgesII( TriHolder& TriHold) const
                                  TriHold[n1].vCompoTria[nCompo1][nTri1].SetVertexNorm( nFeatureIndex1, vtNorm1) ;
                                  TriHold[n2].vCompoTria[nCompo2][nTri2].SetVertexNorm( SharedIndex[3], vtNorm2) ;
                                  TriHold[n2].vCompoTria[nCompo2][nTri2].SetVertexNorm( nFeatureIndex2, vtNorm2) ;
+                                                            
                                  bModified = true ;
                                  break ;
                               }
@@ -2752,8 +2758,8 @@ VolZmap::FlipEdgesII( TriHolder& TriHold) const
                                     TriHold[n2].vCompoTria[nCompo2][nTri2].SetGrade( nCol) ;   
                                  }                
                               }
-                           }
-                        }
+                           }                             
+                        }                         
                      }
                      if ( bModified)
                         break ;
@@ -2901,9 +2907,9 @@ VolZmap::FlipEdgesBB( TriaMatrix& InterTria) const
                                     InterTria[tFB][tVFB].vCompoTria[tCmpF][tTriFB].Validate( true) ;
                                     InterTria[tLB][tVLB].vCompoTria[tCmpL][tTriLB].Validate( true) ;
                                    
-                                   // Setto le normali a ogni vertice
-                                    Vector3d vtNormF = InterTria[tFB][tVFB].vCompoTria[tCmpF][tTriFB].GetN() ;
-                                    Vector3d vtNormL = InterTria[tLB][tVLB].vCompoTria[tCmpL][tTriLB].GetN() ;
+                                   // Setto le normali a ogni vertice                                   
+                                    Vector3d vtNormF = InterTria[tFB][tVFB].vCompoTria[tCmpF][tTriFB].GetVertexNorm( SharedIndex[2]) ;
+                                    Vector3d vtNormL = InterTria[tLB][tVLB].vCompoTria[tCmpL][tTriLB].GetVertexNorm( SharedIndex[1]) ;
                                     int nFeatureIndexF = 0 ;
                                     int nFeatureIndexL = 0 ;
                                     for ( ; nFeatureIndexF < 3  &&  nFeatureIndexL < 3 ; ) {