diff --git a/src/Graphic3d/Graphic3d_GraphicDriver.cxx b/src/Graphic3d/Graphic3d_GraphicDriver.cxx
index ac6bbd33db..3960d6694f 100644
--- a/src/Graphic3d/Graphic3d_GraphicDriver.cxx
+++ b/src/Graphic3d/Graphic3d_GraphicDriver.cxx
@@ -15,159 +15,40 @@
 // commercial license or contractual agreement.
 
 #include <Graphic3d_GraphicDriver.hxx>
-#include <Graphic3d_Structure.hxx>
-#include <Graphic3d_StructureManager.hxx>
-#include <Graphic3d_TransformError.hxx>
-#include <Quantity_Color.hxx>
-#include <Standard_Type.hxx>
-#include <TCollection_AsciiString.hxx>
 
+// =======================================================================
+// function : Graphic3d_GraphicDriver
+// purpose  :
+// =======================================================================
 Graphic3d_GraphicDriver::Graphic3d_GraphicDriver (const Handle(Aspect_DisplayConnection)& theDisp)
-: MyTraceLevel        (0),
-  myDisplayConnection (theDisp),
+: myDisplayConnection (theDisp),
   myDeviceLostFlag    (Standard_False)
 {
   //
 }
 
-//-Internal methods, in order
-
-void Graphic3d_GraphicDriver::PrintBoolean (const Standard_CString AComment, const Standard_Boolean AValue) const {
-
-  cout << "\t" << AComment << " : "
-    << (AValue ? "True" : "False") << "\n";
-  cout << flush;
-
-}
-
-void Graphic3d_GraphicDriver::PrintCLight (const Graphic3d_CLight& theCLight,
-                                           const Standard_Integer  theField) const
-{
-  if (theField)
-  {
-    switch (theCLight.Type) {
-    case 0 :
-      cout << "\tlight type : ambient\n";
-      break;
-    case 1 :
-      cout << "\tlight type : directional\n";
-      break;
-    case 2 :
-      cout << "\tlight type : positional\n";
-      break;
-    case 3 :
-      cout << "\tlight type : spot\n";
-      break;
-    default :
-      cout << "\tlight type : undefined, error\n";
-      break;
-    }
-    cout << flush;
-  }
-}
-
-void Graphic3d_GraphicDriver::PrintCStructure (const Graphic3d_CStructure& ACStructure, const Standard_Integer AField) const {
-
-  if (AField) {
-    cout << "\tstruct id " << ACStructure.Id << "\n";
-    cout << flush;
-  }
-
-}
-
-void Graphic3d_GraphicDriver::PrintCView (const Graphic3d_CView& ACView, const Standard_Integer AField) const {
-
-  if (AField) {
-    cout << "view id " << ACView.Identification() << "\n";
-    cout << "\tXwindow id " << (ACView.Window().IsNull() ? 0 : ACView.Window()->NativeHandle()) << ", "
-      << "activity " << ACView.IsActive() << "\n";
-    cout << flush;
-  }
-
-}
-
-void Graphic3d_GraphicDriver::PrintFunction (const Standard_CString AFunc) const {
-
-  cout << AFunc << "\n";
-  cout << flush;
-
-}
-
-void Graphic3d_GraphicDriver::PrintInteger (const Standard_CString AComment, const Standard_Integer AValue) const {
-
-  cout << "\t" << AComment << " : " << AValue << "\n";
-  cout << flush;
-
-}
-
-void Graphic3d_GraphicDriver::PrintIResult (const Standard_CString AFunc, const Standard_Integer AResult) const {
-
-  cout << AFunc << " = " << AResult << "\n";
-  cout << flush;
-
-}
-
-void Graphic3d_GraphicDriver::PrintMatrix (const Standard_CString AComment, const TColStd_Array2OfReal& AMatrix) const {
-
-  Standard_Integer lr, ur, lc, uc;
-  Standard_Integer i, j;
-
-  lr = AMatrix.LowerRow ();
-  ur = AMatrix.UpperRow ();
-  lc = AMatrix.LowerCol ();
-  uc = AMatrix.UpperCol ();
-
-  if ( (ur - lr + 1 != 4) || (uc - lc + 1 != 4) )
-    Graphic3d_TransformError::Raise
-    ("PrintMatrix : not a 4x4 matrix");
-
-  cout << "\t" << AComment << " :\n";
-  for (i=lr; i<=ur; i++) {
-    for (j=lc; j<=uc; j++) {
-      cout << AMatrix (i, j) << " ";
-    }
-    cout << "\n";
-  }
-  cout << flush;
-
-}
-
-void Graphic3d_GraphicDriver::PrintShortReal (const Standard_CString AComment, const Standard_ShortReal AValue) const {
-
-  cout << "\t" << AComment << " : " << AValue << "\n";
-  cout << flush;
-
-}
-
-void Graphic3d_GraphicDriver::PrintString (const Standard_CString AComment, const Standard_CString AString) const {
-
-  cout << "\t" << AComment << " : " << AString << "\n";
-  cout << flush;
-
-}
-
-void Graphic3d_GraphicDriver::SetTrace (const Standard_Integer ALevel) {
-
-  MyTraceLevel = ALevel;
-
-}
-
-Standard_Integer Graphic3d_GraphicDriver::Trace () const {
-
-  return MyTraceLevel;
-
-}
-
+// =======================================================================
+// function : GetDisplayConnection
+// purpose  :
+// =======================================================================
 const Handle(Aspect_DisplayConnection)& Graphic3d_GraphicDriver::GetDisplayConnection() const
 {
   return myDisplayConnection;
 }
 
+// =======================================================================
+// function : IsDeviceLost
+// purpose  :
+// =======================================================================
 Standard_Boolean Graphic3d_GraphicDriver::IsDeviceLost() const
 {
   return myDeviceLostFlag;
 }
 
+// =======================================================================
+// function : ResetDeviceLostFlag
+// purpose  :
+// =======================================================================
 void Graphic3d_GraphicDriver::ResetDeviceLostFlag()
 {
   myDeviceLostFlag = Standard_False;
diff --git a/src/Graphic3d/Graphic3d_GraphicDriver.hxx b/src/Graphic3d/Graphic3d_GraphicDriver.hxx
index c54b29b692..4df4e19a06 100644
--- a/src/Graphic3d/Graphic3d_GraphicDriver.hxx
+++ b/src/Graphic3d/Graphic3d_GraphicDriver.hxx
@@ -133,30 +133,6 @@ public:
   //! Returns Standard_True if the view associated to the window exists.
   virtual Standard_Boolean ViewExists (const Handle(Aspect_Window)& theWindow, Handle(Graphic3d_CView)& theView) = 0;
 
-  Standard_EXPORT void PrintBoolean (const Standard_CString AComment, const Standard_Boolean AValue) const;
-  
-  Standard_EXPORT void PrintCLight (const Graphic3d_CLight& ACLight, const Standard_Integer AField) const;
-
-  Standard_EXPORT void PrintCStructure (const Graphic3d_CStructure& ACStructure, const Standard_Integer AField) const;
-  
-  Standard_EXPORT void PrintCView (const Graphic3d_CView& ACView, const Standard_Integer AField) const;
-  
-  Standard_EXPORT void PrintFunction (const Standard_CString AFunc) const;
-  
-  Standard_EXPORT void PrintInteger (const Standard_CString AComment, const Standard_Integer AValue) const;
-  
-  Standard_EXPORT void PrintIResult (const Standard_CString AFunc, const Standard_Integer AResult) const;
-  
-  Standard_EXPORT void PrintShortReal (const Standard_CString AComment, const Standard_ShortReal AValue) const;
-  
-  Standard_EXPORT void PrintMatrix (const Standard_CString AComment, const TColStd_Array2OfReal& AMatrix) const;
-  
-  Standard_EXPORT void PrintString (const Standard_CString AComment, const Standard_CString AString) const;
-  
-  Standard_EXPORT void SetTrace (const Standard_Integer ALevel);
-  
-  Standard_EXPORT Standard_Integer Trace() const;
-  
   //! returns Handle to display connection
   Standard_EXPORT const Handle(Aspect_DisplayConnection)& GetDisplayConnection() const;
   
@@ -172,7 +148,6 @@ protected:
   //! Initializes the Driver
   Standard_EXPORT Graphic3d_GraphicDriver(const Handle(Aspect_DisplayConnection)& theDisp);
 
-  Standard_Integer MyTraceLevel;
   Handle(Aspect_DisplayConnection) myDisplayConnection;
   Standard_Boolean myDeviceLostFlag;