diff --git a/API_Nesting.cpp b/API_Nesting.cpp
index e24f412..42e1921 100644
--- a/API_Nesting.cpp
+++ b/API_Nesting.cpp
@@ -41,7 +41,7 @@ __stdcall EgtPackBoxCluster( int nId[], int nCount, double dXmin, double dYmin,
 {
   // verifico
    if ( nId == nullptr  ||  nCount <= 0)
-      return false ;
+      return FALSE ;
   // riempio il vettore
    INTVECTOR vIds ;
    vIds.reserve( nCount) ;
@@ -57,7 +57,7 @@ __stdcall EgtGetClusterBBoxGlob( int nId[], int nCount, double ptMin[3], double
 {
   // verifico
    if ( nId == nullptr  ||  nCount <= 0)
-      return false ;
+      return FALSE ;
   // riempio il vettore
    INTVECTOR vIds ;
    vIds.reserve( nCount) ;
@@ -80,7 +80,7 @@ __stdcall EgtMoveBoxCluster( int nId[], int nCount, double vtMove[3],
 {
   // verifico
    if ( nId == nullptr  ||  nCount <= 0)
-      return false ;
+      return FALSE ;
   // riempio il vettore
    INTVECTOR vIds ;
    vIds.reserve( nCount) ;
@@ -101,7 +101,7 @@ __stdcall EgtVerifyPartCluster( int nId[], int nCount, BOOL bReducedCut,
 {
   // verifico
    if ( nId == nullptr  ||  nCount <= 0)
-      return false ;
+      return FALSE ;
   // riempio il vettore
    INTVECTOR vIds ;
    vIds.reserve( nCount) ;
@@ -120,7 +120,7 @@ __stdcall EgtPackPartCluster( int nId[], int nCount, BOOL bReducedCut,
 {
   // verifico
    if ( nId == nullptr  ||  nCount <= 0)
-      return false ;
+      return FALSE ;
   // riempio il vettore
    INTVECTOR vIds ;
    vIds.reserve( nCount) ;
@@ -139,7 +139,7 @@ __stdcall EgtMovePartCluster( int nId[], int nCount, BOOL bReducedCut, double vt
 {
   // verifico
    if ( nId == nullptr  ||  nCount <= 0)
-      return false ;
+      return FALSE ;
   // riempio il vettore
    INTVECTOR vIds ;
    vIds.reserve( nCount) ;
@@ -182,7 +182,7 @@ __stdcall EgtRotatePartCluster( int nId[], int nCount, BOOL bReducedCut, const d
 {
   // verifico
    if ( nId == nullptr  ||  nCount <= 0  ||  pdRotAngDeg == nullptr)
-      return false ;
+      return FALSE ;
   // riempio il vettore
    INTVECTOR vIds ;
    vIds.reserve( nCount) ;
@@ -194,13 +194,32 @@ __stdcall EgtRotatePartCluster( int nId[], int nCount, BOOL bReducedCut, const d
    return TRUE ;
 }
 
+//-----------------------------------------------------------------------------
+BOOL
+__stdcall EgtAlignPartClusterOnCollision( int nId[], int nCount, BOOL bReducedCut,
+                                          double dXmin, double dYmin, double dXmax, double dYmax)
+{
+  // verifico
+   if ( nId == nullptr  ||  nCount <= 0)
+      return FALSE ;
+  // riempio il vettore
+   INTVECTOR vIds ;
+   vIds.reserve( nCount) ;
+   for ( int i = 0 ; i < nCount ; ++ i)
+      vIds.push_back( nId[i]) ;
+  // eseguo
+   if ( ! ExeAlignPartClusterOnCollision( vIds, ( bReducedCut != FALSE), dXmin, dYmin, dXmax, dYmax))
+      return FALSE ;
+   return TRUE ;
+}
+
 //-----------------------------------------------------------------------------
 BOOL
 __stdcall EgtGetPartClusterCenterGlob( int nId[], int nCount, double ptCen[3])
 {
   // verifico
    if ( nId == nullptr  ||  nCount <= 0  ||  ptCen == nullptr)
-      return false ;
+      return FALSE ;
   // riempio il vettore
    INTVECTOR vIds ;
    vIds.reserve( nCount) ;