diff --git a/wrap/gui/GUI/camera.h b/wrap/gui/GUI/camera.h
new file mode 100644
index 00000000..2952bd11
--- /dev/null
+++ b/wrap/gui/GUI/camera.h
@@ -0,0 +1,72 @@
+#ifndef CAMERA_H
+#define CAMERA_H
+
+#include <vcg/space/point3.h>
+#include <vcg/math/Matrix44.h>
+
+namespace vcg {
+
+template <class T> class ViewGL {
+public:
+  void GetView();
+  void SetView();                      
+  Point3<T> Project(const Point3<T> &p) const;
+  Point3<T> UnProject(const Point3<T> &p) const;
+  Point3<T> ViewPoint();
+
+  Matrix44<T> proj;
+  Matrix44<T> model;
+  Matrix44<T> matrix;
+  Matrix44<T> inverse;  
+  int viewport[4];    
+};
+
+template <class T> void Camera<T>::GetView() {
+  glGetDoublev(GL_PROJECTION_MATRIX, (double *)&proj);
+	glGetDoublev(GL_MODELVIEW_MATRIX, (double *)&model);
+	glGetIntegerv(GL_VIEWPORT, viewport);
+
+  proj.Transpose();
+  model.Transpose();
+
+  matrix.Import(proj * model);
+  inverse = matrix;
+  Invert(inverse);
+}
+
+template <class T> Point3<T> Camera<T>::ViewPoint() {
+  return inverse * Point3<T>(0, 0, 0);
+  /*Matrix44d model(model_matrix);
+	model.Invert();
+  Point3d view = model * Point3d(0, 0, 0);	   
+	return Point3<T>(view[0], view[1], view[2]); */
+}
+
+template <class T> Point3<T> Camera<T>::Project(const Point3<T> &p) const {
+  Point3<T> r;
+  r = matrix * p;  	
+	r[0] = (r[0]+1)*(viewport[2]/2.0)+viewport[0];
+	r[1] =(r[1]+1)*(viewport[3]/2.0)+viewport[1];
+  return r;
+  /*double r[3];
+  gluProject(p[0], p[1], p[2], model_matrix, proj_matrix, viewport, &r[0], &r[1], &r[2]);
+  return Point3<T>((T)r[0], (T)r[1], (T)r[2]);*/
+}
+
+template <class T> Point3<T> Camera<T>::UnProject(const Point3<T> &p) const {
+  Point3<T> s;	
+	s[0] = (p[0]- viewport[0])/ (viewport[2]/2.0) - 1;
+	s[1] = (p[1]- viewport[1])/ (viewport[3]/2.0) - 1;
+	s[2] = p[2];
+	s[1] = -s[1];   // pezza aggiunta per il tan2....  ?????????????
+  s = inverse * s; 
+  return s;	    
+  /*double r[3];  
+  gluUnProject(p[0], p[1], p[2], model_matrix, proj_matrix, viewport, &r[0], &r[1], &r[2]);
+  return Point3<T>((T)r[0], (T)r[1], (T)r[2]);*/
+}
+
+
+}//namespace
+
+#endif
\ No newline at end of file
diff --git a/wrap/gui/GUI/frustum.h b/wrap/gui/GUI/frustum.h
new file mode 100644
index 00000000..4741f9db
--- /dev/null
+++ b/wrap/gui/GUI/frustum.h
@@ -0,0 +1,94 @@
+#ifndef FRUSTUM_H
+#define FRUSTUM_H
+
+#include <wrap/gui/camera.h>
+#include <vcg/space/plane3.h>
+#include <vcg/space/line3.h>
+
+
+namespace vcg {
+
+  template <class T> class Frustum: public Camera {
+public:                                            
+  void GetView();  
+  bool IsOutside(Point3<T> &point);
+  bool IsOutside(Point3<T> &point, T radius);
+  T Distance(Point3<T> &point, int plane);  
+  Point3<T> ViewPoint();
+
+protected:
+  T resolution;  
+  Plane3<T> planes[6];  
+  Point3<T> view_point;  
+};
+
+
+//Implementation
+template <class T> Point3<T> Frustum<T>::ViewPoint() {
+  return view_point;  
+}
+
+template <class T> bool Frustum<T>::IsOutside(Point3<T> &point) {
+  Point3<T> r = Project(point);
+  if(r[0] < viewport[0] || r[0] > viewport[0]+viewport[2] ||
+     r[1] < viewport[1] || r[1] > viewport[1]+viewport[3]) 
+    return true;
+  return false;
+}
+
+template <class T> bool Frustum<T>::IsOutside(Point3<T> &point, T radius) {
+  for(int i = 0; i < 4; i++) {
+    T dist = Distance(point, i);    
+    if(dist < -radius) 
+      return true;  
+  }
+  return false;
+}
+
+template <class T> T Frustum<T>::Distance(Point3<T> &point, int plane) {    
+  return Distance<T>(point, planes[plane]);  
+}
+
+template <class T> void Frustum<T>::GetView() {
+  Camera::GetView();
+  
+  Point3d NE, SE, SW, NW, ne, se, sw, nw;
+  int t = viewport[1] + viewport[3];
+  int b = viewport[1];
+  int r = viewport[0] + viewport[2];
+  int l = viewport[0];
+	
+  Point3d NE, SE, SW, NW, ne, se, sw, nw;
+	gluUnProject(l, b, 0, model_matrix, proj_matrix, viewport, &nw[0], &nw[1], &nw[2]);
+	gluUnProject(l, t, 0, model_matrix, proj_matrix, viewport, &sw[0], &sw[1], &sw[2]);
+	gluUnProject(r, b, 0, model_matrix, proj_matrix, viewport, &ne[0], &ne[1], &ne[2]);
+	gluUnProject(r, t, 0, model_matrix, proj_matrix, viewport, &se[0], &se[1], &se[2]);
+	gluUnProject(l, b, 1, model_matrix, proj_matrix, viewport, &NW[0], &NW[1], &NW[2]);
+	gluUnProject(l, t, 1, model_matrix, proj_matrix, viewport, &SW[0], &SW[1], &SW[2]);
+	gluUnProject(r, b, 1, model_matrix, proj_matrix, viewport, &NE[0], &NE[1], &NE[2]);
+	gluUnProject(r, t, 1, model_matrix, proj_matrix, viewport, &SE[0], &SE[1], &SE[2]);
+
+  view_point = Camera::ViewPoint();  	
+  
+  planes[0].init(view_point,             Point3<T>().Import(nw), Point3<T>().Import(ne));  
+  planes[1].init(view_point,             Point3<T>().Import(ne), Point3<T>().Import(se));
+  planes[2].init(view_point,             Point3<T>().Import(se), Point3<T>().Import(sw));
+  planes[3].init(view_point,             Point3<T>().Import(sw), Point3<T>().Import(nw));
+  planes[4].init(Point3<T>().Import(se), Point3<T>().Import(sw), Point3<T>().Import(nw));
+  planes[5].init(Point3<T>().Import(SW), Point3<T>().Import(SE), Point3<T>().Import(NE));   
+
+  for(int i = 0; i < 6; i++)
+    planes[i].Normalize();
+
+  //calcoliamo la risoluzione: dimenzione di un pixel a distanza 1 dal view_point
+  resolution =  (T)((ne + NE) - (nw + NW)).Norm() /( viewport[2] * ((ne + NE) - (nw + NW)).Norm());
+}
+
+}//namespace
+
+#endif
+
+  
+	
+
+  
diff --git a/wrap/gui/GUI/trackball.h b/wrap/gui/GUI/trackball.h
new file mode 100644
index 00000000..79c9bdb0
--- /dev/null
+++ b/wrap/gui/GUI/trackball.h
@@ -0,0 +1,75 @@
+#ifndef TRACKBALL_H
+#define TRACKBALL_H
+
+#include <vcg/math/similar.h>
+
+namespace vcg {
+
+class Trackball {
+public:
+  Similarf track;
+  Similarf local;
+
+  Trackball();
+  void SetIdentity();
+  void SetPosition(const Similarf &local, int millisec = 0);
+
+  //operating
+  void GetView();
+  void Apply();
+  void Draw();
+  void Reset();
+
+  //interface
+  void MouseDown(int x, int y, Button button);
+	void MouseMove(int x, int y); 
+	void MouseUp(int x, int y, Button button); 
+	void MouseWheel(Button notch);
+  void ButtonUp(Button button);
+  void ButtonDown(Button button);
+
+  //spinning interface
+  void SetSpinnable(bool on);
+  bool IsSpinnable();  
+  bool SetSpinning(Quaternionf &spin);
+  void StopSpinning();
+  bool IsSpinning();  
+
+  //interfaccia navigation:
+  void Back();
+  void Forward();
+  void Home();
+  void HistorySize(int lenght);
+
+  enum { LOCAL, VIEW, SCREEN };
+  
+  enum {
+		ROTATE = 0, ROTATE_G = 1,                             //really makes sense only in VIEW system
+		ROTATE_X = 2, ROTATE_Y = 3, ROTATE_Z = 4,		    // Axis Constrained Rotation 
+		DRAG_X = 5,   DRAG_Y = 6,   DRAG_Z = 7,					// Drag constrained to an axis (trackball axis)
+		DRAG_XY = 8,  DRAG_YZ = 9,  DRAG_XZ = 10,				// Drag constrained to a plane
+		SCALE = 11,                                  //scale respect to center of trackball
+		NONE = 12                                    //disable trackball
+  };
+	enum Button { BUTTON_LEFT = 1, BUTTON_MIDDLE = 2, BUTTON_RIGHT = 4, WHEEL = 8,
+		            KEY_SHIFT = 16, KEY_CTRL = 32, KEY_ALT = 64, HANDLE = 128 };
+protected:
+  Camera camera;
+
+  TrackMode *current;
+
+  Similarf &last();
+  int last_x, last_y;
+  bool dragging;
+  int button_mask;
+
+  Quaternionf spin;
+  bool spinnable;
+  bool spinning;
+
+  std::list<Similarf> history;
+};
+
+}//namespace
+
+#endif
\ No newline at end of file
diff --git a/wrap/gui/GUI/trackmode.h b/wrap/gui/GUI/trackmode.h
new file mode 100644
index 00000000..4572cd12
--- /dev/null
+++ b/wrap/gui/GUI/trackmode.h
@@ -0,0 +1,36 @@
+#ifndef TRACKMODE_H
+#define TRACKMODE_H
+
+namespace vcg {
+
+class TrackMode {
+public:
+};
+
+class SphereMode: public TrackMode {
+public:
+};
+
+class GravityMode: public TrackMode {
+public:
+};
+
+class CylinderMode: public TrackMode {
+public:
+};
+
+class PlaneMode: public TrackMode {
+public:
+};
+
+class LineMode: public TrackMode {
+public:
+};
+
+class ScaleMode: public TrackMode {
+public:
+};
+
+}//namespace 
+
+#endif
\ No newline at end of file