diff --git a/SurfFinishing.cpp b/SurfFinishing.cpp
index 622e23a..a609bfc 100644
--- a/SurfFinishing.cpp
+++ b/SurfFinishing.cpp
@@ -4098,9 +4098,11 @@ SurfFinishing::GetOptimalSfr( ICAvToolSurfTm* pCAvTlStm, const SURFLOCALVECTOR&
   // versore utensile e di movimento longitudinali in frame locale
    Vector3d vtAxL = GetToLoc( vtTool, frSurf) ;
    Vector3d vtMoveL = vtAxL ;
+  // angolo di scelta per divisione dei triangoli
+   double dSplitAngle = 45. ;
+   GetValInNotes( m_Params.m_sUserNotes, "SplitAngle", dSplitAngle) ;
 
   // costanti
-   const double CLIPPING_ANGLE = m_Params.m_dSideAngle ; // Angolo di clipping tra Spiral e ZConst
    const double TOL_SAMPLE = 2. ;                        // Tolleranza di campionamento per collisioni
    const double EXTRA_XY = 2.5 * TOL_SAMPLE ;            // Espansione del Box in X e Y per griglia di campionamento
 
@@ -4162,7 +4164,7 @@ SurfFinishing::GetOptimalSfr( ICAvToolSurfTm* pCAvTlStm, const SURFLOCALVECTOR&
   // per la superficie Spiral e il secondo per la superficie ZConst
    VECTORCOLLISIONSFR vCollision( ( nStepX + 1) * ( nStepY + 1)) ;
    int nInd = 0 ;
-   double dCosClipping = cos( CLIPPING_ANGLE * DEGTORAD) ;
+   double dCosClipping = cos( dSplitAngle * DEGTORAD) ;
    for ( auto it = lPntM.begin() ; it != lPntM.end() ; ++ it) {
      // inserisco il punto di Test
       get<0>( vCollision[nInd].CollisionInfo) = get<0>( *it) ;
@@ -4207,16 +4209,16 @@ SurfFinishing::GetOptimalSfr( ICAvToolSurfTm* pCAvTlStm, const SURFLOCALVECTOR&
    int nThreadMax = thread::hardware_concurrency() ;
    if ( nThreadMax <= 1) {
      // recupero le curve di contorno per la superficie Spiral
-      if ( ! MarchingSquares( vCollision, true, TOL_SAMPLE / 2., nStepX, nStepY, CLIPPING_ANGLE, vtAxL, vtMoveL, pCAvTlStm, vCrvSpiral))
+      if ( ! MarchingSquares( vCollision, true, TOL_SAMPLE / 2., nStepX, nStepY, dSplitAngle, vtAxL, vtMoveL, pCAvTlStm, vCrvSpiral))
          return false ;
      // recupero le curve di contorno per la superficie ZConst
-      if ( ! MarchingSquares( vCollision, false, TOL_SAMPLE / 2., nStepX, nStepY, CLIPPING_ANGLE, vtAxL, vtMoveL, pCAvTlStm, vCrvZConst))
+      if ( ! MarchingSquares( vCollision, false, TOL_SAMPLE / 2., nStepX, nStepY, dSplitAngle, vtAxL, vtMoveL, pCAvTlStm, vCrvZConst))
          return false ;
    }
    else {
       future<bool> vRes[2] ;
-      vRes[0] = async( launch::async, &SurfFinishing::MarchingSquares, this, cref( vCollision), true, TOL_SAMPLE / 2., nStepX, nStepY, CLIPPING_ANGLE, cref( vtAxL), cref( vtMoveL), ref( pCAvTlStm), ref( vCrvSpiral)) ;
-      vRes[1] = async( launch::async, &SurfFinishing::MarchingSquares, this, cref( vCollision), false, TOL_SAMPLE / 2., nStepX, nStepY, CLIPPING_ANGLE, cref( vtAxL), cref( vtMoveL), ref( pCAvTlStm), ref( vCrvZConst)) ;
+      vRes[0] = async( launch::async, &SurfFinishing::MarchingSquares, this, cref( vCollision), true, TOL_SAMPLE / 2., nStepX, nStepY, dSplitAngle, cref( vtAxL), cref( vtMoveL), ref( pCAvTlStm), ref( vCrvSpiral)) ;
+      vRes[1] = async( launch::async, &SurfFinishing::MarchingSquares, this, cref( vCollision), false, TOL_SAMPLE / 2., nStepX, nStepY, dSplitAngle, cref( vtAxL), cref( vtMoveL), ref( pCAvTlStm), ref( vCrvZConst)) ;
       int nFin = 0 ;
       bool bOk = true ;
       while ( nFin < 2) {