diff --git a/Color.cpp b/Color.cpp
index 78849fe..2a98971 100644
--- a/Color.cpp
+++ b/Color.cpp
@@ -90,8 +90,8 @@ Color
 GetSurfBackColor( Color cCol)
 {
    float fLum = ( cCol.GetRed() + cCol.GetGreen() + cCol.GetBlue()) / 3 ;
-   return Color( 0.4 * fLum + 0.2 * cCol.GetRed(),
-                 0.4 * fLum + 0.2 * cCol.GetGreen(),
-                 0.4 * fLum + 0.2 * cCol.GetBlue(),
+   return Color( 0.4 * fLum + 0.4 * cCol.GetRed(),
+                 0.4 * fLum + 0.4 * cCol.GetGreen(),
+                 0.4 * fLum + 0.4 * cCol.GetBlue(),
                  cCol.GetAlpha()) ;
 }
diff --git a/CurveCompositeOffset.cpp b/CurveCompositeOffset.cpp
index ffefa38..5bd390a 100644
--- a/CurveCompositeOffset.cpp
+++ b/CurveCompositeOffset.cpp
@@ -295,15 +295,17 @@ VerifyAndAdjustExternalAngle( ICurve* pCrv1, ICurve* pCrv2, double dDist, int nT
       if ( IsNull( pCrvOri2)  ||  ! pCrvOri2->SimpleOffset( - dDist, nType))
          return false ;
      // eseguo calcolo spostato su curve originali
-      Point3d ptDummy ;
       double dU1 = 1 ;
       double dU2 = 0 ;
+      Point3d ptDummy ;
+      Vector3d vtDir1b ;
+      Vector3d vtDir2b ;
       if ( ! MoveParamToAvoidTg( dU1, ICurve::FROM_MINUS, *pCrvOri1)  ||
-           ! pCrvOri1->GetPointTang( dU1, ICurve::FROM_MINUS, ptDummy, vtDir1)  ||
+           ! pCrvOri1->GetPointTang( dU1, ICurve::FROM_MINUS, ptDummy, vtDir1b)  ||
            ! MoveParamToAvoidTg( dU2, ICurve::FROM_PLUS, *pCrvOri2)  ||
-           ! pCrvOri2->GetPointTang( dU2, ICurve::FROM_PLUS, ptDummy, vtDir2))
+           ! pCrvOri2->GetPointTang( dU2, ICurve::FROM_PLUS, ptDummy, vtDir2b))
          return false ;
-      if ( ! vtDir1.GetAngleXY( vtDir2, dAngDeg))
+      if ( ! vtDir1b.GetAngleXY( vtDir2b, dAngDeg))
          return false ;
    }
 
@@ -336,7 +338,7 @@ VerifyAndAdjustExternalAngle( ICurve* pCrv1, ICurve* pCrv2, double dDist, int nT
    case ICurve::OFF_CHAMFER :
       {
      // lunghezza aggiuntiva in tangenza
-      double dLen = dDist * tan( fabs( dAngDeg) / 4 * DEGTORAD) ;
+      double dLen = fabs( dDist) * tan( fabs( dAngDeg) / 4 * DEGTORAD) ;
      // punti di costruzione smusso
       Point3d ptP1, ptP1a, ptP2a, ptP2 ;
       if ( ! pCrv1->GetEndPoint( ptP1)  ||  ! pCrv2->GetStartPoint( ptP2))
@@ -387,7 +389,7 @@ VerifyAndAdjustExternalAngle( ICurve* pCrv1, ICurve* pCrv2, double dDist, int nT
    case ICurve::OFF_EXTEND :
       {
      // lunghezza aggiuntiva in tangenza
-      double dLen = dDist * tan( fabs( dAngDeg) / 2 * DEGTORAD) ;
+      double dLen = fabs( dDist) * tan( fabs( dAngDeg) / 2 * DEGTORAD) ;
      // punti di costruzione estensione
       Point3d ptP1, ptPc, ptP2 ;
       if ( ! pCrv1->GetEndPoint( ptP1)  ||  ! pCrv2->GetStartPoint( ptP2))
diff --git a/EgtGeomKernel.rc b/EgtGeomKernel.rc
index df59174..3b7967c 100644
Binary files a/EgtGeomKernel.rc and b/EgtGeomKernel.rc differ
diff --git a/GdbExecutor.cpp b/GdbExecutor.cpp
index b6e1bbf..23fd51c 100644
--- a/GdbExecutor.cpp
+++ b/GdbExecutor.cpp
@@ -47,8 +47,7 @@ using namespace std ;
 
 //----------------------------------------------------------------------------
 // Per Id di entità
-static const int ID_SEL = -2 ;
-static const int ID_NO = -3 ;
+static const int ID_NO = -99 ;
 // Per tipo di costruzione di poligono
 static const int POLYG_INSCR = 1 ;
 static const int POLYG_CIRC = 2 ;
@@ -160,7 +159,7 @@ GdbExecutor::AddStandardVariables( void)
       return false ;
   // imposto variabili predefinite
    m_pParser->AddVariable( "$ROOT", GDB_ID_ROOT) ;
-   m_pParser->AddVariable( "$SEL", ID_SEL) ;
+   m_pParser->AddVariable( "$SEL", GDB_ID_SEL) ;
    m_pParser->AddVariable( "$NN", ID_NO) ;
   // verifico la corrispondenza tra GDB_ID_NULL e CMD_ID_NULL
    return ( GDB_ID_NULL == CMD_ID_NULL) ;
@@ -2983,7 +2982,7 @@ GdbExecutor::GetNamesParam( const string& sParam, INTVECTOR& vnNames)
    for ( Iter = vsNames.begin() ; Iter != vsNames.end() ; ++Iter) {
       Trim( (*Iter), " \t\r\n()") ;
       int nId = GetIdParam( *Iter) ;
-      if ( nId != ID_SEL) {
+      if ( nId != GDB_ID_SEL) {
          vnNames.push_back( nId) ;
       }
       else {
@@ -3434,7 +3433,7 @@ GdbExecutor::GetPointsParam( const string& sParam, const Frame3d& frPnt, PolyLin
    STRVECTOR::iterator Iter ;
    for ( Iter = vsPoints.begin() ; Iter != vsPoints.end() ; ++Iter) {
       Trim( (*Iter), " \t\r\n") ;
-      if ( GetIdParam( *Iter) == ID_SEL) {
+      if ( GetIdParam( *Iter) == GDB_ID_SEL) {
          int nId = m_pGDB->GetFirstSelectedObj() ;
          while ( nId != GDB_ID_NULL) {
             Point3d ptP ;
diff --git a/PointsPCA.h b/PointsPCA.h
index a2d8770..0aceff0 100644
--- a/PointsPCA.h
+++ b/PointsPCA.h
@@ -13,8 +13,7 @@
 
 #pragma once
 
-#include "/EgtDev/Include/EGkFrame3d.h"
-#include "/EgtDev/Include/EGkPlane3d.h"
+#include "/EgtDev/Include/EGkPoint3d.h"
 #include "/EgtDev/Extern/Eigen/Dense"
 
 //----------------------------------------------------------------------------