diff --git a/API.h b/API.h
index e306ca3..6230a83 100644
--- a/API.h
+++ b/API.h
@@ -57,6 +57,7 @@ BOOL __stdcall EgtFrame( int nId, Frame3d& frFrame) ;
 //--------------------------- Scene ------------------------------------------
 BOOL __stdcall EgtSetBackground( Color TopCol, Color BottomCol, BOOL bRedraw) ;
 BOOL __stdcall EgtSetMarkAttribs( Color MarkCol) ;
+BOOL __stdcall EgtSetSelSurfAttribs( Color SelSurfCol) ;
 BOOL __stdcall EgtSetGeoLineAttribs( Color GlCol) ;
 BOOL __stdcall EgtSetWinRectAttribs( BOOL bOutline, Color WrCol) ;
 
diff --git a/API_GdbModifyCurve.cpp b/API_GdbModifyCurve.cpp
index 17fc1ea..ad4cd04 100644
--- a/API_GdbModifyCurve.cpp
+++ b/API_GdbModifyCurve.cpp
@@ -19,6 +19,7 @@
 #include "/EgtDev/Include/EgkCurve.h"
 #include "/EgtDev/Include/EgkCurveArc.h"
 #include "/EgtDev/Include/EgkCurveComposite.h"
+#include "/EgtDev/Include/EgkDistPointCurve.h"
 
 
 //----------------------------------------------------------------------------
@@ -143,7 +144,7 @@ __stdcall EgtTrimCurveEndAtParam( int nId, double dPar)
    ICurve* pCurve = GetCurve( pGeomDB->GetGeoObj( nId)) ;
    if ( pCurve == nullptr)
       return false ;
-  // taglio la curva all'inizio
+  // taglio la curva alla fine
    return ( pCurve->TrimEndAtParam( dPar) ? TRUE : FALSE) ;
 }
 
@@ -161,6 +162,32 @@ __stdcall EgtTrimCurveStartEndAtParam( int nId, double dParS, double dParE)
    return ( pCurve->TrimStartEndAtParam( dParS, dParE) ? TRUE : FALSE) ;
 }
 
+//----------------------------------------------------------------------------
+BOOL
+__stdcall EgtSplitCurveAtPoint( int nId, double ptOn[3])
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, FALSE)
+  // recupero la curva
+   ICurve* pCurve = GetCurve( pGeomDB->GetGeoObj( nId)) ;
+   if ( pCurve == nullptr)
+      return FALSE ;
+  // determino la posizione parametrica del punto sulla curva (con tolleranza)
+   DistPointCurve dstPC( ptOn, *pCurve) ;
+   int nFlag ;
+   double dU ;
+   if ( ! dstPC.GetParamAtMinDistPoint( 0, dU, nFlag)  ||  nFlag != MDPCI_NORMAL)
+      return FALSE ;
+  // copio la curva
+   int nCopyId = pGeomDB->Copy( nId, GDB_ID_NULL, nId, GDB_AFTER) ;
+   if ( nCopyId == GDB_ID_NULL)
+      return FALSE ;
+  // tengo la prima parte dell'originale e la seconda parte della copia
+   if ( ! pCurve->TrimEndAtParam( dU))
+      return false ;
+   return ( EgtTrimCurveStartAtParam( nCopyId, dU) ? TRUE : FALSE) ;
+}
+
 //-------------------------------------------------------------------------------
 BOOL
 __stdcall EgtModifyCurveCircleCPN( int nId, const double ptOn[3])
@@ -236,7 +263,7 @@ __stdcall EgtModifyCurveArc3P( int nId, const double ptMid[3])
 
 //-------------------------------------------------------------------------------
 BOOL
-__stdcall EgtSplitCurveCompo( int nId)
+__stdcall EgtSeparateCurveCompo( int nId)
 {
    IGeomDB* pGeomDB = GetCurrGeomDB() ;
    VERIFY_GEOMDB( pGeomDB, FALSE)
diff --git a/API_GeoBase.cpp b/API_GeoBase.cpp
index b6fa341..0c02e74 100644
--- a/API_GeoBase.cpp
+++ b/API_GeoBase.cpp
@@ -338,6 +338,23 @@ __stdcall EgtPointLocToLoc( double* pdX, double* pdY, double* pdZ,
 
 //-----------------------------------------------------------------------------
 //                        Frame3d
+//-----------------------------------------------------------------------------
+BOOL
+__stdcall EgtFrameFrom3Points( double ptO[3], double ptOnX[3], double ptNearY[3],
+                               double ptOrig[3], double vtX[3], double vtY[3], double vtZ[3])
+{
+  // calcolo il riferimento
+   Frame3d frTemp ;
+   if ( ! frTemp.Set( Point3d( ptO), Point3d( ptOnX), Point3d( ptNearY)))
+      return FALSE ;
+  // aggiorno i parametri del frame
+   VEC_FROM_3D( ptOrig, frTemp.Orig())
+   VEC_FROM_3D( vtX, frTemp.VersX())
+   VEC_FROM_3D( vtY, frTemp.VersY())
+   VEC_FROM_3D( vtZ, frTemp.VersZ())
+   return TRUE ;
+}
+
 //-----------------------------------------------------------------------------
 BOOL
 __stdcall EgtFrameTranslate( double ptOrig[3], double vtX[3], double vtY[3], double vtZ[3],
diff --git a/API_Scene.cpp b/API_Scene.cpp
index 989897d..aab757f 100644
--- a/API_Scene.cpp
+++ b/API_Scene.cpp
@@ -90,6 +90,23 @@ __stdcall EgtSetMarkAttribs( Color MarkCol)
    return ( pGseCtx->m_pScene->SetMark( MarkCol) ? TRUE : FALSE) ;
 }
 
+//-----------------------------------------------------------------------------
+BOOL
+__stdcall EgtSetSelSurfAttribs( const int SelSurfCol[4])
+{
+   return EgtSetSelSurfAttribs( Color( SelSurfCol)) ;
+}
+
+//-----------------------------------------------------------------------------
+BOOL
+__stdcall EgtSetSelSurfAttribs( Color SelSurfCol)
+{
+   GseContext* pGseCtx = GetCurrGseContext() ;
+   VERIFY_CTX_SCENE( pGseCtx, FALSE)
+  // imposto il colore del Mark
+   return ( pGseCtx->m_pScene->SetSelSurf( SelSurfCol) ? TRUE : FALSE) ;
+}
+
 //-----------------------------------------------------------------------------
 BOOL
 __stdcall EgtSetGeoLineAttribs( const int GlCol[4])
diff --git a/EgtInterface.rc b/EgtInterface.rc
index df0e5f8..00dea8a 100644
Binary files a/EgtInterface.rc and b/EgtInterface.rc differ