diff --git a/IntersLineSurfBez.cpp b/IntersLineSurfBez.cpp
index b9780e1..2a6d42d 100644
--- a/IntersLineSurfBez.cpp
+++ b/IntersLineSurfBez.cpp
@@ -282,22 +282,23 @@ IntersLineSurfBzBilinear( const Point3d& ptL, const Vector3d& vtL, double dLen,
    int nRoots = PolynomialRoots( 2, vdCoeff, vdRoots) ;
    bool bFound = false ;
    for( int w = 0 ; w < nRoots ; ++w) {
-   if ( vdRoots[w] > 0 - EPS_ZERO && vdRoots[w] < 1 + EPS_ZERO ) {
-      double dU = 0, dV = vdRoots[w] ;
-      // verifico che non sia una soluzione con molteplicità > 1
-      bool bAlreadyFound = false ;
-      for ( int k = w - 1 ; k >= 0 &&  ! bAlreadyFound ; --k)
-         bAlreadyFound = abs( dV - vdRoots[k]) < EPS_PARAM ;
-      if( ! bAlreadyFound) {
-         dU = (dV * (C1 - C2) + ( D1 - D2)) / ( dV * ( A2 - A1) + ( B2 - B1)) ;
-         if ( dU > - EPS_ZERO  &&  dU < 1 + EPS_ZERO) {
-            Point3d ptIBez, ptIBez2 ;
-            Vector3d vtN ;
-            pSurfBz->GetPointNrmD1D2(dU, dV, ISurfBezier::Side::FROM_MINUS, ISurfBezier::Side::FROM_MINUS, ptIBez, vtN) ;
-            Point3d ptSP( dU, dV, 0), ptSP2 ;
-            double dCos = vtN * vtL, dCos2 = 0 ;
-            UpdateInfoIntersLineSurfBz( ptL, vtL, ILTT_NO_TRIA, -1, ptSP, ptIBez, dCos, ptSP2, ptIBez2, dCos2, vInfo) ;
-            bFound = true ;
+      if ( vdRoots[w] > 0 - EPS_ZERO && vdRoots[w] < 1 + EPS_ZERO ) {
+         double dU = 0, dV = vdRoots[w] ;
+         // verifico che non sia una soluzione con molteplicità > 1
+         bool bAlreadyFound = false ;
+         for ( int k = w - 1 ; k >= 0 &&  ! bAlreadyFound ; --k)
+            bAlreadyFound = abs( dV - vdRoots[k]) < EPS_PARAM ;
+         if( ! bAlreadyFound) {
+            dU = (dV * (C1 - C2) + ( D1 - D2)) / ( dV * ( A2 - A1) + ( B2 - B1)) ;
+            if ( dU > - EPS_ZERO  &&  dU < 1 + EPS_ZERO) {
+               Point3d ptIBez, ptIBez2 ;
+               Vector3d vtN ;
+               pSurfBz->GetPointNrmD1D2(dU, dV, ISurfBezier::Side::FROM_MINUS, ISurfBezier::Side::FROM_MINUS, ptIBez, vtN) ;
+               Point3d ptSP( dU, dV, 0), ptSP2 ;
+               double dCos = vtN * vtL, dCos2 = 0 ;
+               UpdateInfoIntersLineSurfBz( ptL, vtL, ILTT_NO_TRIA, -1, ptSP, ptIBez, dCos, ptSP2, ptIBez2, dCos2, vInfo) ;
+               bFound = true ;
+            }
          }
       }
    }
@@ -334,11 +335,11 @@ IntersLineSurfBzBilinear( const Point3d& ptL, const Vector3d& vtL, double dLen,
          }
 
          Point3d ptInt1, ptInt2 ;
-         if ( c < nTot - 1  && c > 0) {
+         if ( nClosestLine < nTot - 1  && nClosestLine > 0) {
             // tra i due tratti dell'approssimazione che arrivano al punto selezionato come più vicino, devo trovare quale si avvicina di più
             Point3d ptStart ; plApprox.GetFirstPoint( ptStart) ;
             Point3d ptEnd ;
-            for( int z = 1 ; z < c - 1 ; ++z)
+            for( int z = 1 ; z < nClosestLine - 1 ; ++z)
                plApprox.GetNextPoint( ptStart) ;
             plApprox.GetNextPoint( ptEnd) ;
             // linea precedente al punto
@@ -361,7 +362,7 @@ IntersLineSurfBzBilinear( const Point3d& ptL, const Vector3d& vtL, double dLen,
             else
                dllCurr.GetMinDistPoints( ptInt1, ptInt2) ;
          }
-         else if ( c == 0){
+         else if ( nClosestLine == 0){
             // il punto più vicino è sulla prima linea
             Point3d ptStart ; plApprox.GetFirstPoint( ptStart) ;
             Point3d ptEnd ; plApprox.GetNextPoint( ptEnd) ;
@@ -370,11 +371,11 @@ IntersLineSurfBzBilinear( const Point3d& ptL, const Vector3d& vtL, double dLen,
             DistLineLine dllCurr( ptStart, vtLineCurr, dLenCurr, ptL, vtL,dLen) ;
             dllCurr.GetMinDistPoints( ptInt1, ptInt2) ;
          }
-         else if ( c == nTot- 1) {
+         else if ( nClosestLine == nTot- 1) {
             // il punto più vicino è sull'ultima linea
             Point3d ptStart ; plApprox.GetFirstPoint( ptStart) ;
             Point3d ptEnd ;
-            for( int z = 1 ; z < c - 1 ; ++z)
+            for( int z = 1 ; z < nClosestLine - 1 ; ++z)
                plApprox.GetNextPoint( ptStart) ;
             plApprox.GetNextPoint( ptEnd) ;
             Vector3d vtLinePre = ptEnd - ptStart ;