diff --git a/vcg/container/container_allocation_table.h b/vcg/container/container_allocation_table.h
new file mode 100644
index 00000000..a3107279
--- /dev/null
+++ b/vcg/container/container_allocation_table.h
@@ -0,0 +1,269 @@
+/****************************************************************************
+* 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.                                                         *
+*                                                                           *
+****************************************************************************/
+
+
+#ifndef __VCGLIB_CAT__
+#define __VCGLIB_CAT__
+
+#include <vector>
+#include <list>
+#include <algorithm>
+#include <assert.h>
+#include <vcg/entries_allocation_table.h>
+
+namespace vcg {
+
+// CATBase: abstract base class for all the allocation tables
+template <class STL_CONT>
+class CATBase{
+public:
+typedef STL_CONT::value_type VALUE_TYPE;
+
+virtual void Resort(VALUE_TYPE*,VALUE_TYPE*) =0;
+virtual void Remove(const STL_CONT&) = 0;
+virtual void AddDataElem(VALUE_TYPE*,int)=0;
+
+public:
+// ID serves as a type trait. 
+static int & Id(){
+			static int id=0;
+			return id;
+			}	
+};
+
+// CATEntry: first derivation templated on the type of entry
+// It implements all the methods to trace and access TVector element
+template <class STL_CONT, class ENTRY_TYPE>
+class CATEntry: public CATBase<STL_CONT>{
+public:
+typedef STL_CONT::value_type VALUE_TYPE;
+typedef ENTRY_TYPE EntryType;
+
+CATEntry(){if(Id()==0){
+							Id() = CATBase<STL_CONT>::Id()+1;
+							CATBase<STL_CONT>::Id() = Id();
+							}
+					}
+
+
+static unsigned int Ord(VALUE_TYPE *);
+static ENTRY_TYPE & GetEntry(STL_CONT::value_type*pt);
+
+static	void  Insert( STL_CONT & c );							// insert a vector to trace
+virtual void	Remove(  const STL_CONT  &	c);			// remove the container c
+static  void	Remove(  VALUE_TYPE  *	v);					// remove the container that contains v
+
+virtual void Resort(	VALUE_TYPE* old_start,			// resort the allocation table
+											VALUE_TYPE* new_start);			// after a container was moved
+	
+protected:
+
+static std::list<ENTRY_TYPE >& AT(){							// tallocation table
+static std::list<ENTRY_TYPE > allocation_table; 
+		return allocation_table;
+	}
+static bool & UTD(){
+	static bool upToDate;														// true if Lower() and  Upper() 
+	return upToDate;																// are up to date
+	}
+
+static VALUE_TYPE *& Lower() {
+	static VALUE_TYPE * lower;											// pointer to the first element
+	return lower;																		// of the last container accessed
+	}
+static VALUE_TYPE *& Upper() {
+	static VALUE_TYPE * upper;											// pointer to the first element
+	return upper;																		// if the container next to the last accessed
+}		
+
+static std::list<ENTRY_TYPE>::iterator	 & Curr(){		// container that was last accessed
+	static std::list<ENTRY_TYPE>::iterator currEntry;
+	return currEntry;
+}
+
+
+static bool IsTheSameAsLast(VALUE_TYPE *pt);	// true if pt is in the  container
+																							// that was accessed last
+static void Update(VALUE_TYPE*);							// set Upper() e Lower() 
+static std::list<ENTRY_TYPE>::iterator FindBase(const VALUE_TYPE * pt);	
+																							// find the container that contains pt (naive)
+virtual  void  AddDataElem(STL_CONT::value_type * pt,int n);// add n element to the auxiliary data
+
+public:
+static int & Id(){															// unique identifier of the istance
+		static int id=0;														// (used as type trait)
+		return id;
+		}
+};
+
+// --------------------------- CATEntry: implementation --------------------
+
+template <class STL_CONT, class ENTRY_TYPE>
+unsigned int CATEntry<STL_CONT,ENTRY_TYPE>::
+
+Ord(VALUE_TYPE * pt)
+{
+	Update(pt);
+	return (pt-Lower());
+}
+
+
+template <class STL_CONT, class ENTRY_TYPE>
+std::list<ENTRY_TYPE>::iterator CATEntry<STL_CONT,ENTRY_TYPE>::
+
+FindBase(const VALUE_TYPE * pt)
+{
+std::list<ENTRY_TYPE>::iterator 
+ite = AT().begin(),curr_base;
+
+std::list<ENTRY_TYPE> tmp = AT();
+for(;ite != AT().end();ite++)
+	if( pt < (*ite).Start())
+		return curr_base;
+	else
+		curr_base = ite;
+
+return curr_base;
+}
+
+
+template <class STL_CONT, class ENTRY_TYPE>
+ bool CATEntry< STL_CONT, ENTRY_TYPE>::
+ 
+IsTheSameAsLast(VALUE_TYPE * pt)
+{
+return ( UTD() && ( !(Lower()> pt)) && (pt < Upper()) );
+}
+
+template <class STL_CONT, class ENTRY_TYPE>
+void CATEntry< STL_CONT, ENTRY_TYPE>::
+
+Update(VALUE_TYPE * pt)
+{
+if(!IsTheSameAsLast(pt)){
+	std::list<ENTRY_TYPE>::iterator lower_ite;
+	lower_ite = FindBase(pt);
+
+	assert(	lower_ite!=AT().end());
+
+	Lower() = (*lower_ite).Start();
+	if( (*lower_ite).Start() == AT().back().Start())
+		Upper() = (VALUE_TYPE *) 0xffffffff;
+	else
+	{
+		lower_ite++;		
+		Upper() = (*lower_ite).Start();
+	}
+	
+	Curr() = lower_ite;
+	UTD() = true;
+	}
+}
+
+template <class STL_CONT, class ENTRY_TYPE>
+void CATEntry< STL_CONT,  ENTRY_TYPE>::
+Resort(VALUE_TYPE* old_start,VALUE_TYPE* new_start)
+{
+AT().sort();
+UTD() = false;
+}
+
+template <class STL_CONT, class ENTRY_TYPE>
+void CATEntry<STL_CONT, ENTRY_TYPE>::
+
+Remove( const STL_CONT & c )
+{
+std::list<ENTRY_TYPE>::iterator ite;
+for(ite = AT().begin(); ite != AT().end();  ++ite)
+if((*ite).C() == &c)
+	{
+		AT().erase(ite);
+		break;
+	}
+UTD() = false;
+}
+
+template <class STL_CONT, class ENTRY_TYPE>
+void CATEntry<STL_CONT, ENTRY_TYPE>::
+
+Remove(VALUE_TYPE  *	pt)
+{
+	std::list<ENTRY_TYPE>::iterator lower_ite;
+	lower_ite = FindBase(pt);
+	AT().erase(lower_ite);
+	UTD() = false;
+}
+
+template <class STL_CONT, class ENTRY_TYPE>
+void CATEntry<STL_CONT, ENTRY_TYPE>::
+
+Insert( STL_CONT & c )
+{
+ENTRY_TYPE entry(c);
+std::list<ENTRY_TYPE>::iterator lower_ite,upper_ite;
+upper_ite = std::lower_bound(AT().begin(),	AT().end(), entry);
+lower_ite = AT().insert(upper_ite,entry);
+lower_ite->Reserve(c.capacity());
+lower_ite->Resize(c.size());
+UTD() = false;
+}
+template <class STL_CONT, class ENTRY_TYPE>
+ENTRY_TYPE & CATEntry<STL_CONT, ENTRY_TYPE>::
+GetEntry(STL_CONT::value_type*pt){
+Update(pt);
+return *Curr();
+}
+
+template <class STL_CONT, class ENTRY_TYPE>
+void CATEntry<STL_CONT, ENTRY_TYPE>::
+
+AddDataElem(STL_CONT::value_type * pt,int n)
+{
+Update(pt);
+Curr()->Push_back(n);
+}
+
+//--------------------------------------------------------------------------------------------
+// CAT: derivation of CATEntry for the case where the temporary data is unique for each type.
+// VERY IMPORTANT: there cannot be two vector of value with the same type of temporary datya
+// This class is used to implement optional core data (NormalOpt, CoordOpt etc...)
+template <class STL_CONT,class ATTR_TYPE>
+class CAT:public CATEntry<STL_CONT, EntryCAT<STL_CONT,ATTR_TYPE> >{
+public:
+typedef typename EntryCAT<STL_CONT,ATTR_TYPE> EntryType;
+static ATTR_TYPE & Get(STL_CONT::value_type * pt);
+}; 
+//---------------------- CAT: implementation---------------------------------------------------
+template <class STL_CONT, class ATTR_TYPE>
+ATTR_TYPE & CAT<STL_CONT,ATTR_TYPE>::
+
+Get(STL_CONT::value_type * pt)
+{
+int ord = Ord(pt);
+return Curr()->Data()[ord];
+}
+//---------------------------------------------------------------------------------------------
+
+};//end namespace vcg
+
+#endif
\ No newline at end of file
diff --git a/vcg/container/entries_allocation_table.h b/vcg/container/entries_allocation_table.h
new file mode 100644
index 00000000..4eed0ff3
--- /dev/null
+++ b/vcg/container/entries_allocation_table.h
@@ -0,0 +1,149 @@
+/****************************************************************************
+* 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.                                                         *
+*                                                                           *
+****************************************************************************/
+
+
+#ifndef __VCGLIB_ENTRIES__
+#define __VCGLIB_ENTRIES__
+
+namespace vcg {
+
+// EntryCATBase: base class for the entry of the allocation table
+// templated over the container type
+template <class STL_CONT>
+struct EntryCATBase{
+
+EntryCATBase(STL_CONT & _c):c(_c){};
+STL_CONT::value_type * Start() const;
+const STL_CONT *  C();
+virtual void Push_back(const int &){};
+
+virtual void Reserve(const int & s){};
+virtual void Resize(const int & s){};
+
+const bool operator < (const EntryCATBase<STL_CONT> & other) const;
+
+private:
+	STL_CONT & c;
+};
+
+//EntryCAT: entry for the case of optional core types (matches with CAT)
+template <class STL_CONT,class ATTR_TYPE >
+struct EntryCAT: public EntryCATBase<STL_CONT>{
+typedef ATTR_TYPE attr_type;
+EntryCAT(STL_CONT & _c) : EntryCATBase<STL_CONT>(_c){};
+std::vector<ATTR_TYPE> & Data(){return data;}
+void Push_back(const int & n){ for(int i = 0; i < n ; ++i) data.push_back(ATTR_TYPE());}
+virtual void Reserve(const int & s){data.reserve(s);};
+virtual void Resize(const int & s){data.resize(s);};
+
+
+private:
+std::vector<ATTR_TYPE> data;
+};
+
+//----------------------EntryCAT: implementation ----------------------------------------
+template <class STL_CONT>
+const bool EntryCATBase<STL_CONT>:: operator < (const EntryCATBase<STL_CONT> & other) const{
+	return (Start() < other.Start());
+}
+
+template <class STL_CONT>
+ STL_CONT::value_type  * EntryCATBase<STL_CONT>::Start()const {
+	return &(*(c.begin()));
+	}
+
+template <class STL_CONT>
+	const STL_CONT * EntryCATBase<STL_CONT>::C(){
+	return &c;
+	}
+
+
+
+// -----------------------------------------------------------------------------------------
+// WrapBase: used to implement a list of pointers to std::vector of different types
+// Wrap: derived from WrapBase (to take the function and from std::vector)
+struct WrapBase{
+virtual void Push_back(const int & n)=0;
+virtual void Reserve(const int & n)=0;
+virtual void Resize(const int & n)=0;	
+	};
+// (note) double hineritance is not necessary, just handy
+template <class ATTR_TYPE>
+struct Wrap: public WrapBase,std::vector<ATTR_TYPE>{
+	virtual void Push_back(const int & n){for (int i = 0 ; i < n;	++i) push_back(		ATTR_TYPE());}	
+	virtual void Reserve(const int & n){reserve(n);}
+	virtual void Resize(const int & n){resize(n);}	
+	};
+//-------------------------------------------------------------------------------------------
+
+// -----------------------------------------------------------------------------------------
+// EntryCATMulti: entry type for multiple user data
+template <class STL_CONT>
+struct EntryCATMulti: public EntryCATBase<STL_CONT>{
+
+EntryCATMulti(STL_CONT & _c) : EntryCATBase<STL_CONT>(_c){};
+std::list<WrapBase * > & Data(){return data;}
+void push_back(const int & n ){
+	std::list< void * >::iterator ite;
+	for(ite = data.begin(); ite != data.end(); ++ite)
+		(*ite)->Push_back(n);
+	}
+virtual void Reserve(const int & n){
+																			std::list<WrapBase * >::iterator ite;
+																			for(ite = data.begin(); ite != data.end(); ++ite)
+																				(*ite)->Reserve(n);
+																		};
+virtual void Resize(const int & n){		
+																			std::list<WrapBase * >::iterator ite;
+																			for(ite = data.begin(); ite != data.end(); ++ite)
+																				(*ite)->Resize(n);
+																	};
+
+private:
+	std::list< WrapBase * > data;
+};
+//----------------------------------------------------------------------------------
+
+
+//----------------------------------------------------------------------------------
+// TempData implements a handle to one of the vector od data stored in EntryCATMulti
+template <class STL_CONT, class ATTR_TYPE>
+class TempData{
+public:
+	TempData(std::vector<ATTR_TYPE>  *d):item(d){};
+		typedef typename ATTR_TYPE attr_type;
+
+		std::vector<ATTR_TYPE>  * Item(){return item;};
+		std::vector<ATTR_TYPE>  * item;
+		ATTR_TYPE & operator [](STL_CONT::value_type * v)
+			{
+				int pos = CATEntry<STL_CONT, EntryCATMulti<STL_CONT> >::Ord(v);
+				return (*item)[pos];
+			}
+	};
+//----------------------------------------------------------------------------------
+
+
+}; // end namespace vcg
+
+#endif
\ No newline at end of file
diff --git a/vcg/container/simple_temporary_data.h b/vcg/container/simple_temporary_data.h
new file mode 100644
index 00000000..91b20081
--- /dev/null
+++ b/vcg/container/simple_temporary_data.h
@@ -0,0 +1,65 @@
+/****************************************************************************
+* 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.                                                         *
+*                                                                           *
+****************************************************************************/
+
+
+#ifndef __VCGLIB_SIMPLE__
+#define __VCGLIB_SIMPLE__
+
+#include <vector>
+
+namespace vcg {
+
+template <class STL_CONT, class ATTR_TYPE>
+class SimpleTempData{
+public:
+typedef typename ATTR_TYPE attr_type;
+
+STL_CONT& c;
+std::vector<ATTR_TYPE> data;
+
+SimpleTempData(STL_CONT  &_c):c(_c){};
+
+// access to data
+ATTR_TYPE & operator[](const STL_CONT::value_type *v){return data[v-&*c.begin()];}
+ATTR_TYPE & operator[](const int & i){return data[i];}
+
+// start temporary attribute
+void Start(){data.reserve(c.capacity());data.resize(c.size());}
+
+// stop temporary attribute
+void Stop(){data.clear();}
+
+// update temproary data size 
+bool UpdateSize(){
+		if(data.size() != c.size())
+			{
+				data.resize(c.size());
+				return false;
+			}
+		return true;
+	}
+};
+
+}; // end namespace vcg
+
+#endif
\ No newline at end of file
diff --git a/vcg/container/traced_vector.h b/vcg/container/traced_vector.h
new file mode 100644
index 00000000..99e0148d
--- /dev/null
+++ b/vcg/container/traced_vector.h
@@ -0,0 +1,152 @@
+/****************************************************************************
+* 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.                                                         *
+*                                                                           *
+****************************************************************************/
+
+
+#ifndef __VCGLIB_TRACED_VECTOR__
+#define __VCGLIB_TRACED_VECTOR__
+
+
+#include <vcg/container_allocation_table.h>
+#include <assert.h>
+
+namespace vcg {
+
+template <class VALUE_TYPE>
+class TVector: public std::vector<VALUE_TYPE>{
+	typedef TVector<VALUE_TYPE> THIS_TYPE;
+public:
+	TVector():std::vector<VALUE_TYPE>(){reserve(1);}
+	~TVector();
+	
+
+	std::list < CATBase<THIS_TYPE>* > 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);
+
+	template <class ATTR_TYPE>
+		void EnableAttribute(){
+			CAT<THIS_TYPE,ATTR_TYPE> * cat = new CAT<THIS_TYPE,ATTR_TYPE>();
+			cat->Insert(*this);
+			attributes.push_back(cat);
+			}
+
+	template <class ATTR_TYPE>
+		void DisableAttribute(){
+				std::list < CATBase<THIS_TYPE> * >::iterator ia; 
+				for(ia = attributes.begin(); ia != attributes.end(); ++ia)
+					if((*ia)->Id() == CAT<THIS_TYPE,ATTR_TYPE>::Id())
+						{
+							(*ia)->Remove(*this);
+							delete (*ia);
+							attributes.erase(ia);
+							break;
+						}
+				}
+
+	template <class ATTR_TYPE>
+		TempData<THIS_TYPE,ATTR_TYPE> NewTempData(){
+			//CAT<THIS_TYPE,EntryCATMulti>::Insert(*this)
+			CATEntry<THIS_TYPE,EntryCATMulti<THIS_TYPE> >::EntryType 
+				entry = CATEntry<THIS_TYPE,EntryCATMulti<THIS_TYPE> >::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<THIS_TYPE,ATTR_TYPE>((Wrap<ATTR_TYPE>*) entry.Data().back());
+			}
+			
+	template <class ATTR_TYPE>
+		void DeleteTempData(TempData<THIS_TYPE,ATTR_TYPE> & td){
+			//CAT<THIS_TYPE,EntryCATMulti>::Insert(*this)
+			CATEntry<THIS_TYPE,EntryCATMulti<THIS_TYPE> >::EntryType 
+				entry = CATEntry<THIS_TYPE,EntryCATMulti<THIS_TYPE> >::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 TVector<VALUE_TYPE>::push_back(const VALUE_TYPE & v){
+	std::vector<VALUE_TYPE>::push_back(v);
+	std::list < CATBase<THIS_TYPE> * >::iterator ia; 
+	for(ia = attributes.begin(); ia != attributes.end(); ++ia)
+		(*ia)->AddDataElem(&(*(this->begin())),1);
+	Update();
+}
+template <class VALUE_TYPE>
+void TVector<VALUE_TYPE>::pop_back(){
+	std::vector<VALUE_TYPE>::pop_back();
+	Update();
+}
+
+template <class VALUE_TYPE>
+void TVector<VALUE_TYPE>::resize(const unsigned int & size){
+	std::vector<VALUE_TYPE>::resize(size);
+	std::list < CATBase<THIS_TYPE> * >::iterator ia; 
+	for(ia = attributes.begin(); ia != attributes.end(); ++ia)
+		(*ia)->
+	Update();
+}
+
+template <class VALUE_TYPE>
+void TVector<VALUE_TYPE>::reserve(const unsigned int & size){
+	std::vector<VALUE_TYPE>::reserve(size);
+	Update();
+}
+
+template <class VALUE_TYPE>
+	void TVector<VALUE_TYPE>::
+		Update(){
+		std::list < CATBase<THIS_TYPE> * >::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>
+TVector<VALUE_TYPE>::~TVector(){
+		std::list < CATBase<THIS_TYPE> * >::iterator ia; 
+		for(ia = attributes.begin(); ia != attributes.end(); ++ia)
+			{	
+				(*ia)->Remove(*this);
+				delete *ia;
+			}
+		}
+
+}; // end namespace
+#endif