diff --git a/vcg/container/container_allocation_table.h b/vcg/container/container_allocation_table.h
index 79f8a2dd..d1d88c50 100644
--- a/vcg/container/container_allocation_table.h
+++ b/vcg/container/container_allocation_table.h
@@ -24,6 +24,9 @@
   History
 
 $Log: not supported by cvs2svn $
+Revision 1.6  2005/07/07 13:33:51  ganovelli
+some comment
+
 Revision 1.5  2005/07/06 15:28:10  ganovelli
 aggiornamento di alcuni path
 
@@ -65,6 +68,7 @@ typedef typename typename STL_CONT::value_type ValueType;
 virtual void Resort(ValueType*,ValueType*) =0;
 virtual void Remove(const STL_CONT&) = 0;
 virtual void AddDataElem(ValueType*,int)=0;
+virtual void Resize(ValueType*,int)=0;
 
 public:
 // ID serves as a type trait. 
@@ -132,6 +136,7 @@ static void Update(ValueType*);							// set Upper() e Lower()
 static typename std::list<ENTRY_TYPE>::iterator FindBase(const ValueType * pt);	
 																							// find the container that contains pt (naive)
 virtual  void  AddDataElem(typename STL_CONT::value_type * pt,int n);// add n element to the auxiliary data
+virtual  void  Resize(typename STL_CONT::value_type * pt,int n);// resize the  auxiliary data
 
 public:
 static int & Id(){															// unique identifier of the istance
@@ -141,7 +146,7 @@ static int & Id(){															// unique identifier of the istance
 };
 
 // --------------------------- CATEntry: implementation --------------------
-
+// derivazione fatta per i membri Occ (Optional Component Compact)
 template <typename STL_CONT, class ENTRY_TYPE>
 unsigned int CATEntry<STL_CONT,ENTRY_TYPE>::
 
@@ -157,6 +162,9 @@ typename std::list<ENTRY_TYPE>::iterator CATEntry<STL_CONT,ENTRY_TYPE>::
 
 FindBase(const ValueType * pt)
 {
+//DEBUG
+int sz = AT().size();
+//
 std::list<ENTRY_TYPE>::iterator ite,curr_base,_;
 ite = AT().begin();
 curr_base = AT().end();
@@ -185,7 +193,7 @@ void CATEntry< STL_CONT, ENTRY_TYPE>::
 Update(ValueType * pt)
 {
 if(!IsTheSameAsLast(pt)){
-	std::list<ENTRY_TYPE>::iterator lower_ite;
+	std::list<ENTRY_TYPE>::iterator lower_ite,upper_ite;
 	lower_ite = FindBase(pt);
 
 	assert(	lower_ite!=AT().end());
@@ -195,8 +203,8 @@ if(!IsTheSameAsLast(pt)){
 		Upper() = (ValueType *) 0xffffffff;
 	else
 	{
-		lower_ite++;		
-		Upper() = (*lower_ite).Start();
+		upper_ite = lower_ite;	++upper_ite;	
+		Upper() = (*upper_ite).Start();
 	}
 	
 	Curr() = lower_ite;
@@ -289,15 +297,25 @@ Update(pt);
 Curr()->Push_back(n);
 }
 
+
+template <typename STL_CONT, class ENTRY_TYPE>
+void CATEntry<STL_CONT, ENTRY_TYPE>::
+
+Resize(typename STL_CONT::value_type * pt,int n)
+{
+Update(pt);
+Curr()->Resize(n);
+}
+
+
 //--------------------------------------------------------------------------------------------
-// CAT: derivation of CATEntry for the case where the temporary data is unique for each type.
-// VERY IMPORTANT: there cannot be two vectors of value with the same type of temporary datya
-// This class is used to implement optional core data (NormalOpt, CoordOpt etc...)
 template <typename STL_CONT,class ATTR_TYPE>
 class CAT:public CATEntry<STL_CONT, EntryCAT<STL_CONT,ATTR_TYPE> >{
 typedef typename typename STL_CONT::value_type ValueType;
 public:
 static ATTR_TYPE & Get(ValueType * pt);
+static CAT<STL_CONT,ATTR_TYPE> * New();
+static CAT<STL_CONT,ATTR_TYPE> *& Instance(){ static CAT<STL_CONT,ATTR_TYPE> *  instance=NULL; return instance;}
 }; 
 //---------------------- CAT: implementation---------------------------------------------------
 template <typename STL_CONT, class ATTR_TYPE>
@@ -306,8 +324,22 @@ ATTR_TYPE & CAT<STL_CONT,ATTR_TYPE>::
 Get(ValueType * pt)
 {
 int ord = Ord(pt);
+//int ord = pt-  &(*  ((*AT().begin()).C()->begin())); se AT() contiene un solo elemento funziona anche cosė
 return Curr()->Data()[ord];
 }
+
+template <typename STL_CONT, class ATTR_TYPE>
+CAT<STL_CONT,ATTR_TYPE> * CAT<STL_CONT,ATTR_TYPE>::
+
+New(){
+	if(Instance()==NULL) 
+		{
+		 Instance() =  new CAT<STL_CONT,ATTR_TYPE>();
+		}
+	return Instance();
+	}
+
+
 //---------------------------------------------------------------------------------------------
 
 };//end namespace vcg
diff --git a/vcg/container/vector_occ.h b/vcg/container/vector_occ.h
new file mode 100644
index 00000000..6d302b94
--- /dev/null
+++ b/vcg/container/vector_occ.h
@@ -0,0 +1,204 @@
+/****************************************************************************
+* VCGLib                                                            o o     *
+* Visual and Computer Graphics Library                            o     o   *
+*                                                                _   O  _   *
+* Copyright(C) 2004                                                \/)\/    *
+* Visual Computing Lab                                            /\/|      *
+* ISTI - Italian National Research Council                           |      *
+*                                                                    \      *
+* All rights reserved.                                                      *
+*                                                                           *
+* This program is free software; you can redistribute it and/or modify      *   
+* it under the terms of the GNU General Public License as published by      *
+* the Free Software Foundation; either version 2 of the License, or         *
+* (at your option) any later version.                                       *
+*                                                                           *
+* This program is distributed in the hope that it will be useful,           *
+* but WITHOUT ANY WARRANTY; without even the implied warranty of            *
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             *
+* GNU General Public License (http://www.gnu.org/licenses/gpl.txt)          *
+* for more details.                                                         *
+*                                                                           *
+****************************************************************************/
+/****************************************************************************
+  History
+
+$Log: not supported by cvs2svn $
+Revision 1.5  2005/07/07 13:33:52  ganovelli
+some comment
+
+Revision 1.4  2004/04/05 18:20:08  ganovelli
+Aggiunto typename
+
+Revision 1.3  2004/03/31 22:36:44  ganovelli
+First Working Release (with this comment)
+
+/****************************************************************************/
+
+#ifndef __VCGLIB_TRACED_VECTOR__
+#define __VCGLIB_TRACED_VECTOR__ 
+
+
+#include <vcg/container/container_allocation_table.h>
+#include <vcg/container/entries_allocation_table.h>
+
+#include <assert.h>
+
+namespace vcg {
+	/*@{*/
+/*!
+ * This class represent a Traced Vector. A vector_occ is derived by a std::vector.
+ * The characteristic of a vector_occ is that you can add (at run time) new attributes
+ * to the container::value_type elements contained in the vector. (see the example..)
+ * The position in memory of a traced vector is kept by the Container Allocation Table,
+ * which is a (unique) list of vector_occ positions.
+ */
+
+template <class VALUE_TYPE>
+class vector_occ: public std::vector<VALUE_TYPE>{
+	typedef typename vector_occ<VALUE_TYPE> ThisType;
+
+public:
+	vector_occ():std::vector<VALUE_TYPE>(){reserve(1);}
+	~vector_occ();
+	
+
+	std::list < CATBase<ThisType>* > attributes;
+	// override di tutte le funzioni che possono spostare 
+	// l'allocazione in memoria del container
+	void push_back(const VALUE_TYPE & v);
+	void pop_back();
+	void resize(const unsigned int & size);
+	void reserve(const unsigned int & size);
+
+	/// this function enable the use of an optional attribute (see...)
+	template <class ATTR_TYPE>
+		void EnableAttribute(){
+			CAT<ThisType,ATTR_TYPE> * cat = CAT<ThisType,ATTR_TYPE>::New();
+			cat->Insert(*this);
+			attributes.push_back(cat);
+			}
+
+	/// this function disable the use of an optional attribute (see...)
+  /// Note: once an attribute is disabled, its data is lost (the memory freed)
+	template <class ATTR_TYPE>
+		void IsEnabledAttribute(){
+				std::list < CATBase<ThisType> * >::iterator ia; 
+				for(ia = attributes.begin(); ia != attributes.end(); ++ia)
+					if((*ia)->Id() == CAT<ThisType,ATTR_TYPE>::Id())
+						return true;
+				return false;
+				}
+
+
+	/// this function disable the use of an optional attribute (see...)
+  /// Note: once an attribute is disabled, its data is lost (the memory freed)
+	template <class ATTR_TYPE>
+		void DisableAttribute(){
+				std::list < CATBase<ThisType> * >::iterator ia; 
+				for(ia = attributes.begin(); ia != attributes.end(); ++ia)
+					if((*ia)->Id() == CAT<ThisType,ATTR_TYPE>::Id())
+						{
+							(*ia)->Remove(*this);
+							//delete (*ia);
+							attributes.erase(ia);
+							break;
+						}
+				}
+
+	/// this function create a new attribute of type ATTR_TYPE and return an handle to
+  /// access the value of the attribute. Ex:
+  /// vector_occ<float> tv;
+  /// TempData<TVect,int> handle =  tv.NewTempData<int>();
+  /// // now handle[&tv[123]] is the value of integer attribute associate with the position 123 on the vector
+  /// // NOTE: it works also if you do some push_back, resize, pop_back, reserve that cause the relocation
+  /// // of the vector_occ
+	template <class ATTR_TYPE>
+		TempData<ThisType,ATTR_TYPE> NewTempData(){
+			typedef typename CATEntry<ThisType,EntryCATMulti<ThisType> >::EntryType EntryTypeMulti;
+			CATEntry<ThisType,EntryTypeMulti>::Insert(*this);
+			EntryTypeMulti	entry = CATEntry<ThisType,EntryTypeMulti >::GetEntry(&*begin());
+			entry.Data().push_back(new Wrap< ATTR_TYPE>);
+
+			((Wrap<ATTR_TYPE>*)entry.Data().back())->reserve(capacity());
+			((Wrap<ATTR_TYPE>*)entry.Data().back())->resize(size());
+
+			return TempData<ThisType,ATTR_TYPE>((Wrap<ATTR_TYPE>*) entry.Data().back());
+			}
+
+	/// reciprocal of NewTempData
+	template <class ATTR_TYPE>
+		void DeleteTempData(TempData<ThisType,ATTR_TYPE> & td){
+			typedef typename CATEntry<ThisType,EntryCATMulti<ThisType> >::EntryType EntryTypeMulti;
+			CATEntry<ThisType,EntryTypeMulti >::RemoveIfEmpty(*this);
+			EntryTypeMulti
+				entry = CATEntry<ThisType,EntryCATMulti<ThisType> >::GetEntry(&*begin());
+
+			entry.Data().remove((Wrap<ATTR_TYPE>*)td.Item());
+			delete ((Wrap<ATTR_TYPE>*)td.Item());
+			}
+
+
+private:	
+	VALUE_TYPE * old_start;
+	void Update();
+};
+
+	/*@}*/
+
+template <class VALUE_TYPE>
+void vector_occ<VALUE_TYPE>::push_back(const VALUE_TYPE & v){
+	std::vector<VALUE_TYPE>::push_back(v);
+	Update();	
+	std::list < CATBase<ThisType> * >::iterator ia; 
+	for(ia = attributes.begin(); ia != attributes.end(); ++ia)
+		(*ia)->AddDataElem(&(*(this->begin())),1);
+
+}
+template <class VALUE_TYPE>
+void vector_occ<VALUE_TYPE>::pop_back(){
+	std::vector<VALUE_TYPE>::pop_back();
+	Update();
+}
+
+template <class VALUE_TYPE>
+void vector_occ<VALUE_TYPE>::resize(const unsigned int & size){
+	std::vector<VALUE_TYPE>::resize(size);
+	Update();
+	std::list < CATBase<ThisType> * >::iterator ia; 
+	for(ia = attributes.begin(); ia != attributes.end(); ++ia)
+		(*ia)->
+	Resize(&(*(this->begin())),size);
+}
+
+template <class VALUE_TYPE>
+void vector_occ<VALUE_TYPE>::reserve(const unsigned int & size){
+	std::vector<VALUE_TYPE>::reserve(size);
+	Update();
+}
+
+template <class VALUE_TYPE>
+	void vector_occ<VALUE_TYPE>::
+		Update(){
+		std::list < CATBase<ThisType> * >::iterator ia; 
+		if(&(*begin()) != old_start)
+			for(ia = attributes.begin(); ia != attributes.end(); ++ia)
+				(*ia)->Resort(old_start,&(*begin()));
+
+		old_start = &(*begin());
+	}
+
+
+
+template <class VALUE_TYPE>
+vector_occ<VALUE_TYPE>::~vector_occ(){
+		std::list < CATBase<ThisType> * >::iterator ia; 
+		for(ia = attributes.begin(); ia != attributes.end(); ++ia)
+			{	
+				(*ia)->Remove(*this);
+				delete *ia;
+			}
+		}
+
+}; // end namespace
+#endif