diff --git a/API_Nesting.cpp b/API_Nesting.cpp
index 332e28b..e24f412 100644
--- a/API_Nesting.cpp
+++ b/API_Nesting.cpp
@@ -88,10 +88,10 @@ __stdcall EgtMoveBoxCluster( int nId[], int nCount, double vtMove[3],
       vIds.push_back( nId[i]) ;
   // eseguo
    Vector3d vtM = vtMove ;
-   bool bOk = ExeMoveBoxCluster( vIds, vtM, dXmin, dYmin, dXmax, dYmax, dOffs) ;
+   if ( ! ExeMoveBoxCluster( vIds, vtM, dXmin, dYmin, dXmax, dYmax, dOffs))
+      return FALSE ;
    VEC_FROM_3D( vtMove, vtM)
-
-   return ( bOk ? TRUE : FALSE) ;
+   return TRUE ;
 }
 
 //-----------------------------------------------------------------------------
@@ -108,9 +108,9 @@ __stdcall EgtVerifyPartCluster( int nId[], int nCount, BOOL bReducedCut,
    for ( int i = 0 ; i < nCount ; ++ i)
       vIds.push_back( nId[i]) ;
   // eseguo
-   bool bOk = ExeVerifyPartCluster( vIds, ( bReducedCut != FALSE), dXmin, dYmin,dXmax, dYmax) ;
-
-   return ( bOk ? TRUE : FALSE) ;
+   if ( ! ExeVerifyPartCluster( vIds, ( bReducedCut != FALSE), dXmin, dYmin,dXmax, dYmax))
+      return FALSE ;
+   return TRUE ;
 }
 
 //-----------------------------------------------------------------------------
@@ -127,9 +127,9 @@ __stdcall EgtPackPartCluster( int nId[], int nCount, BOOL bReducedCut,
    for ( int i = 0 ; i < nCount ; ++ i)
       vIds.push_back( nId[i]) ;
   // eseguo
-   bool bOk = ExePackPartCluster( vIds, ( bReducedCut != FALSE), dXmin, dYmin,dXmax, dYmax, ( bBottomUp != FALSE)) ;
-
-   return ( bOk ? TRUE : FALSE) ;
+   if ( ! ExePackPartCluster( vIds, ( bReducedCut != FALSE), dXmin, dYmin,dXmax, dYmax, ( bBottomUp != FALSE)))
+      return FALSE ;
+   return TRUE ;
 }
 
 //-----------------------------------------------------------------------------
@@ -147,10 +147,32 @@ __stdcall EgtMovePartCluster( int nId[], int nCount, BOOL bReducedCut, double vt
       vIds.push_back( nId[i]) ;
   // eseguo
    Vector3d vtM = vtMove ;
-   bool bOk = ExeMovePartCluster( vIds, ( bReducedCut != FALSE), vtM, dXmin, dYmin, dXmax, dYmax) ;
+   if ( ! ExeMovePartCluster( vIds, ( bReducedCut != FALSE), vtM, dXmin, dYmin, dXmax, dYmax))
+      return FALSE ;
    VEC_FROM_3D( vtMove, vtM)
+   return TRUE ;
+}
 
-   return ( bOk ? TRUE : FALSE) ;
+//-----------------------------------------------------------------------------
+BOOL
+__stdcall EgtGetObstacleTangent( double vtTang[3])
+{
+   Vector3d vtT ;
+   if ( ! ExeGetObstacleTangent( vtT))
+      return FALSE ;
+   VEC_FROM_3D( vtTang, vtT)
+   return TRUE ;
+}
+
+//-----------------------------------------------------------------------------
+BOOL
+__stdcall EgtGetMovingTangent( double vtTang[3])
+{
+   Vector3d vtT ;
+   if ( ! ExeGetMovingTangent( vtT))
+      return FALSE ;
+   VEC_FROM_3D( vtTang, vtT)
+   return TRUE ;
 }
 
 //-----------------------------------------------------------------------------
@@ -167,9 +189,9 @@ __stdcall EgtRotatePartCluster( int nId[], int nCount, BOOL bReducedCut, const d
    for ( int i = 0 ; i < nCount ; ++ i)
       vIds.push_back( nId[i]) ;
   // eseguo
-   bool bOk = ExeRotatePartCluster( vIds, ( bReducedCut != FALSE), ptCen, *pdRotAngDeg, dXmin, dYmin, dXmax, dYmax) ;
-
-   return ( bOk ? TRUE : FALSE) ;
+   if ( ! ExeRotatePartCluster( vIds, ( bReducedCut != FALSE), ptCen, *pdRotAngDeg, dXmin, dYmin, dXmax, dYmax))
+      return FALSE ;
+   return TRUE ;
 }
 
 //-----------------------------------------------------------------------------
diff --git a/EgtInterface.rc b/EgtInterface.rc
index 57ae7bd..6a93099 100644
Binary files a/EgtInterface.rc and b/EgtInterface.rc differ