diff --git a/EGkColor.h b/EGkColor.h
index 613da03..b3a7a0c 100644
--- a/EGkColor.h
+++ b/EGkColor.h
@@ -51,6 +51,10 @@ class Color
               m_Col[GREEN] = (( dGreen < 0) ? 0 : (( dGreen > 1) ? MAX_RGB : int( dGreen * MAX_RGB))) ;
               m_Col[BLUE] = (( dBlue < 0) ? 0 : (( dBlue > 1) ? MAX_RGB : int( dBlue * MAX_RGB))) ;
               m_Col[ALPHA] = (( dAlpha < 0) ? 0 : (( dAlpha > 1) ? MAX_ALPHA : int( dAlpha * MAX_ALPHA))) ; }
+      void SetAlpha( int nAlpha)
+            { m_Col[ALPHA] = (( nAlpha < 0) ? 0 : (( nAlpha > MAX_ALPHA) ? MAX_ALPHA : nAlpha)) ; }
+      void SetAlpha( double dAlpha)
+            { m_Col[ALPHA] = (( dAlpha < 0) ? 0 : (( dAlpha > 1) ? MAX_ALPHA : int( dAlpha * MAX_ALPHA))) ; }
       int GetIntRed( void) const
             { return m_Col[RED] ; }
       int GetIntGreen( void) const
@@ -105,4 +109,5 @@ const Color BROWN( 150, 75, 0) ;
 //----------------------------------------------------------------------------
 EGK_EXPORT bool GetStdColor( const std::string& sName, Color& cCol) ;
 EGK_EXPORT bool GetNameOfStdColor( Color cCol, std::string& sName) ;
-EGK_EXPORT Color GetOppositeColor( Color cCol) ;
\ No newline at end of file
+EGK_EXPORT Color GetOppositeColor( Color cCol) ;
+EGK_EXPORT Color GetSurfBackColor( Color cCol) ;
diff --git a/EGkGdbConst.h b/EGkGdbConst.h
index a2fafc7..88c02ca 100644
--- a/EGkGdbConst.h
+++ b/EGkGdbConst.h
@@ -47,6 +47,7 @@ enum GdbMark { GDB_MK_OFF = 0,
 enum GdbMaterial { GDB_MT_COLOR = -1,
                    GDB_MT_PARENT = 0} ;
 // valori positivi indicano indici nella lista dei materiali (1 based)
+const int GDB_MT_NULL = GDB_MT_PARENT ;
 
 //----------------- Costanti flag di BBox --------------------------------------
 enum BBoxFlag { BBF_NONE = 0,
diff --git a/EGkGdbIterator.h b/EGkGdbIterator.h
index 7db25e0..1a13e5d 100644
--- a/EGkGdbIterator.h
+++ b/EGkGdbIterator.h
@@ -68,10 +68,13 @@ class __declspec( novtable) IGdbIterator
       virtual bool GetMark( int& nMark) const = 0 ;
       virtual bool GetCalcMark( int& nMark) const = 0 ;
       virtual bool SetMaterial( int nMat) = 0 ;
+      virtual bool SetMaterial( int nMat, const std::string& sMatName) = 0 ;
       virtual bool SetMaterial( Color cCol) = 0 ;
       virtual bool GetMaterial( int& nMat) const = 0 ;
+      virtual bool GetMaterial( Material& mMat) const = 0 ;
       virtual bool GetMaterial( Color& cCol) const = 0 ;
       virtual bool GetCalcMaterial( int& nMat) const = 0 ;
+      virtual bool GetCalcMaterial( Material& mMat) const = 0 ;
       virtual bool GetCalcMaterial( Color& cCol) const = 0 ;
       virtual bool SetName( const std::string& sName) = 0 ;
       virtual bool GetName( std::string& sName) const = 0 ;
diff --git a/EGkGeomDB.h b/EGkGeomDB.h
index d8ee17b..422f905 100644
--- a/EGkGeomDB.h
+++ b/EGkGeomDB.h
@@ -1,13 +1,13 @@
 //----------------------------------------------------------------------------
-//  EgalTech 2013-2013
+//  EgalTech 2013-2014
 //----------------------------------------------------------------------------
-// File : EGkGeomDB.h           Data : 24.11.13          Versione : 1.3a1
+// File : EGkGeomDB.h           Data : 26.04.14          Versione : 1.5d7
 // Contenuto : Dichiarazione della interfaccia IGeomDB.
 //
 //
 //
 // Modifiche : 24.11.13 DS Creazione modulo.
-//
+//             26.04.14 DS Agg. gestione libreria materiali.
 //
 //----------------------------------------------------------------------------
 
@@ -16,7 +16,7 @@
 #include "/EgtDev/Include/EGkGdbConst.h"
 #include "/EgtDev/Include/EGkGeoFrame3d.h"
 #include "/EgtDev/Include/EGkGeoObj.h"
-#include "/EgtDev/Include/EGkColor.h"
+#include "/EgtDev/Include/EGkMaterial.h"
 #include "/EgtDev/Include/EGtILogger.h"
 #include <string>
 
@@ -102,10 +102,13 @@ class __declspec( novtable) IGeomDB
       virtual bool SetDefaultMaterial( Color cCol) = 0 ;
       virtual bool GetDefaultMaterial( Color& cCol) const = 0 ;
       virtual bool SetMaterial( int nId, int nMat) = 0 ;
+      virtual bool SetMaterial( int nId, const std::string& sMatName) = 0 ;
       virtual bool SetMaterial( int nId, Color cCol) = 0 ;
       virtual bool GetMaterial( int nId, int& nMat) const = 0 ;
+      virtual bool GetMaterial( int nId, Material& mMat) const = 0 ;
       virtual bool GetMaterial( int nId, Color& cCol) const = 0 ;
       virtual bool GetCalcMaterial( int nId, int& nMat) const = 0 ;
+      virtual bool GetCalcMaterial( int nId, Material& mMat) const = 0 ;
       virtual bool GetCalcMaterial( int nId, Color& cCol) const = 0 ;
       virtual bool SetName( int nId, const std::string& sName) = 0 ;
       virtual bool GetName( int nId, std::string& sName) const = 0 ;
@@ -113,6 +116,16 @@ class __declspec( novtable) IGeomDB
       virtual bool SetInfo( int nId, const std::string& sKey, const std::string& sInfo) = 0 ;
       virtual bool GetInfo( int nId, const std::string& sKey, std::string& sInfo) const = 0 ;
       virtual bool RemoveInfo( int nId, const std::string& sKey) = 0 ;
+     // material library
+      virtual int  AddMaterial( const std::string& sName, const Material& matM) = 0 ;
+      virtual int  FindMaterial( const std::string& sName) const = 0 ;
+      virtual bool EraseMaterial( int nMat, bool& bInUse) = 0 ;
+      virtual bool GetMaterialData( int nMat, Material& matM) const = 0 ;
+      virtual bool GetMaterialName( int nMat, std::string& sName) const = 0 ;
+      virtual bool ExistsMaterial( int nMat) const = 0 ;
+      virtual bool IsCustomMaterial( int nMat, bool& bCustom) const = 0 ;
+      virtual bool ModifyMaterialData( int nMat, const Material& matM) = 0 ;
+      virtual bool ModifyMaterialName( int nMat, const std::string& sName) = 0 ;
 } ;
 
 //-----------------------------------------------------------------------------
diff --git a/EGkMaterial.h b/EGkMaterial.h
new file mode 100644
index 0000000..5644044
--- /dev/null
+++ b/EGkMaterial.h
@@ -0,0 +1,87 @@
+//----------------------------------------------------------------------------
+//  EgalTech 2014-2014
+//----------------------------------------------------------------------------
+// File : EGkMaterial.h         Data : 23.04.14          Versione : 1.5d7
+// Contenuto : Implementazione della classe Material.
+//
+//
+//
+// Modifiche : 23.04.14 DS Creazione modulo.
+//
+//
+//----------------------------------------------------------------------------
+
+#pragma once
+
+#include "/EgtDev/Include/EGkColor.h"
+
+//----------------------- Macro per import/export ----------------------------
+#undef EGK_EXPORT
+#if defined( I_AM_EGK)            // da definirsi solo nella DLL
+   #define EGK_EXPORT __declspec( dllexport)
+#else
+   #define EGK_EXPORT __declspec( dllimport)
+#endif
+
+//-----------------------------------------------------------------------------
+const int MAX_SHIN = 128 ;
+
+//-----------------------------------------------------------------------------
+class Material
+{
+   public :
+      Material( void) : m_colAmb( Color()), m_colDiff( Color()), m_colSpec( Color()), m_fShin( 64)
+            {}
+      Material( Color colAmb, Color colDiff, Color colSpec, double dShin)
+            { Set( colAmb, colDiff, colSpec, dShin) ; }
+      Material( Color colC)
+            { Set( colC) ; }
+      void Set( void)
+            { m_colAmb = Color() ; m_colDiff = Color() ; m_colSpec = Color() ; }
+      void Set( Color colAmb, Color colDiff, Color colSpec, double dShin)
+            { m_colAmb = colAmb ; m_colDiff = colDiff ; m_colSpec = colSpec ; AdjustAlpha() ;
+              m_fShin = float( dShin) ; AdjustShin() ; }
+      void Set( Color colC)
+            { m_colAmb = colC ; m_colDiff = colC ; m_colSpec = Color( 192, 192, 192) ; AdjustAlpha() ;
+              m_fShin = 64 ; }
+      void SetAmbient( Color colAmb)
+            {  m_colAmb = colAmb ; AdjustAlpha() ; }
+      void SetDiffuse( Color colDiff)
+            {  m_colDiff = colDiff ; AdjustAlpha() ; }
+      void SetSpecular( Color colSpec)
+            {  m_colSpec = colSpec ; AdjustAlpha() ; }
+      void SetAlpha( int nAlpha)
+            { m_colDiff.SetAlpha( nAlpha) ; AdjustAlpha() ; }
+      void SetAlpha( double dAlpha)
+            { m_colDiff.SetAlpha( dAlpha) ; AdjustAlpha() ; }
+      void SetShininess( int nShin)
+            { m_fShin = float( nShin) ; AdjustShin() ; }
+      void SetShininess( double dShin)
+            { m_fShin = float( dShin) ; AdjustShin() ; }
+      Color GetAmbient( void) const
+            { return m_colAmb ; }
+      Color GetDiffuse( void) const
+            { return m_colDiff ; }
+      Color GetSpecular( void) const
+            { return m_colSpec ; }
+      float GetAlpha( void) const
+            { return m_colDiff.GetAlpha() ; }
+      float GetShininess( void) const
+            { return m_fShin ; }
+      bool operator == ( const Material& other) const
+            { return ( m_colAmb == other.m_colAmb &&
+                       m_colDiff == other.m_colDiff &&
+                       m_colSpec == other.m_colSpec) ; }
+
+   private :
+      void AdjustAlpha( void)
+              { m_colAmb.SetAlpha( m_colDiff.GetAlpha()) ; m_colSpec.SetAlpha( m_colDiff.GetAlpha()) ; }
+      void AdjustShin( void)
+              { m_fShin = (( m_fShin < 0) ? 0 : (( m_fShin > MAX_SHIN) ? MAX_SHIN : m_fShin)) ; }
+
+   private :
+      Color m_colAmb ;     // solo RGB
+      Color m_colDiff ;    // RGBA ( alpha del materiale)
+      Color m_colSpec ;    // solo RGB
+      float m_fShin ;      // lucentezza (scala 0-128)
+} ;
diff --git a/EGnStringUtils.h b/EGnStringUtils.h
index a8fb6a8..f83eab1 100644
--- a/EGnStringUtils.h
+++ b/EGnStringUtils.h
@@ -60,6 +60,13 @@ ToLower( std::string& sString)
       { std::transform( sString.begin(), sString.end(), sString.begin(), ::tolower) ;
         return sString ; }
 
+//----------------------------------------------------------------------------
+inline bool
+IsValidName( const std::string& sName)
+      { if ( sName.empty())
+           return false ;
+        return ( sName.find_first_of( "\\/:*?\"<>|", 0) == std::string::npos) ; } 
+
 //----------------------------------------------------------------------------
 inline bool
 FromString( const std::string& sVal, int& nVal)