diff --git a/EGkTriangle3d.h b/EGkTriangle3d.h
index df05a50..1828e05 100644
--- a/EGkTriangle3d.h
+++ b/EGkTriangle3d.h
@@ -85,8 +85,9 @@ class Triangle3d
 
 //----------------------------------------------------------------------------
 // Raccolte di Triangle3d
-typedef std::vector<Triangle3d>  TRIA3DVECTOR ;   // vettore di Triangle3d
-typedef std::list<Triangle3d>    TRIA3DLIST ;     // lista di Triangle3d
+typedef std::vector<Triangle3d>  TRIA3DVECTOR ;      // vettore di Triangle3d
+typedef std::list<Triangle3d>    TRIA3DLIST ;        // lista di Triangle3d
+typedef std::vector<TRIA3DLIST>  TRIA3DLISTVECTOR ;  // vettore di liste di Triangle3d
 
 //-----------------------------------------------------------------------------
 // Flags indicanti se i lati sono parte del contorno di un poligono di pił triangoli
diff --git a/EGkVolZmap.h b/EGkVolZmap.h
index 911a338..5a58f9a 100644
--- a/EGkVolZmap.h
+++ b/EGkVolZmap.h
@@ -32,8 +32,7 @@ class __declspec( novtable) IVolZmap : public IGeoObj
       virtual bool CreateFromTriMesh( const ISurfTriMesh& Surf, double dPrec, bool bTriDex) = 0 ;
       virtual bool GetAllTriangles( TRIA3DLIST& lstTria) const = 0 ;
       virtual int  GetBlockCount( void) const = 0 ;
-      virtual bool GetBlockInfo( std::vector<bool> & bModified) const = 0 ;
-      virtual bool GetBlockTriangles( int nBlock, TRIA3DLIST& lstTria) const = 0 ;
+      virtual bool GetTriangles( bool bAllBlocks, INTVECTOR& nModifiedBlocks, TRIA3DLISTVECTOR& vLstTria) const ;
       virtual bool GetDexelLines( int nDir, int nPos1, int nPos2, POLYLINELIST& lstPL) const = 0 ;
       virtual bool SetTolerances( double dLinTol, double dAngTolDeg = 90) = 0 ;
       virtual bool SetStdTool( const std::string& pToolName, double dH, double dR, double dCornR) = 0 ;