diff --git a/apps/test/trackball/main.cpp b/apps/test/trackball/main.cpp
index 040ca3e2..615a929e 100644
--- a/apps/test/trackball/main.cpp
+++ b/apps/test/trackball/main.cpp
@@ -1,5 +1,179 @@
-#include <vcg/wrap/GUI/trackball.h>
+#include <iostream>
+using namespace std;
+
+template <class A, class B> class pippo {
+public:
+  int a() { return 1; }
+};
+
+template <> class pippo<int, int> {
+public:
+  int a() { return 2; }
+};
 
 int main() {
+  pippo<int, int> p;
+  cerr << p.a() << endl;
+  return 0;
+}
+/*
+#include<windows.h>
+#include <SDL/SDL.h>
+
+#include <GL/gl.h>
+#include <GL/glu.h>
+#include <GL/glut.h>
+#include <wrap/gui/trackball.h>
+
+using namespace vcg;
+
+bool fullscreen = false;
+//int width =1024;
+//int height = 768;
+int width = 800;
+int height = 600;
+
+
+
+SDL_Surface *screen = NULL;
+
+bool init() {
+  
+  if(SDL_Init(SDL_INIT_VIDEO) != 0) {
+    return false;
+  }
+
+  const SDL_VideoInfo *info = SDL_GetVideoInfo();
+  int bpp = info->vfmt->BitsPerPixel;
+
+  SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 5);
+  SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+
+  int flags = SDL_OPENGL;
+  if(fullscreen) 
+    flags |= SDL_FULLSCREEN;
+
+  screen = SDL_SetVideoMode(width, height, bpp, flags);
+  if(!screen) {
+    return false;
+  }
+  
+  SDL_WM_SetIcon(SDL_LoadBMP("inspector.bmp"), NULL);
+  SDL_WM_SetCaption(" Inspector", "Inspector");
+
+
+  glDisable(GL_DITHER);
+  glShadeModel(GL_SMOOTH);
+  glHint( GL_FOG_HINT, GL_NICEST );
+  glEnable(GL_DEPTH_TEST);
+  glDepthFunc( GL_LEQUAL );
+  glDisable(GL_LIGHTING); 
+
+  return true;
+}
+
+
+
+
+int wmain(int argc, unsigned short **argv) {
+  if(!init()) return -1;
+
+  Trackball trackball;
+
+  int quit = 0;
+  int x, y;
+  SDL_Event event;  
+  while( !quit ) {                
+    while( SDL_PollEvent( &event ) ){                        
+      switch( event.type ) {
+        case SDL_QUIT:  quit = 1; break; 
+
+        case SDL_KEYDOWN:   
+          switch(event.key.keysym.sym) {
+            case SDLK_RSHIFT:
+            case SDLK_LSHIFT:
+              trackball.ButtonDown(Trackball::KEY_SHIFT);
+              break;
+
+            case SDLK_RCTRL:
+            case SDLK_LCTRL:
+              trackball.ButtonDown(Trackball::KEY_CTRL);
+              break;
+
+            case SDLK_RALT:
+            case SDLK_LALT:
+              trackball.ButtonDown(Trackball::KEY_ALT);
+              break;
+          }
+          break;
+
+        case SDL_KEYUP:
+          switch(event.key.keysym.sym) {
+            case SDLK_q: exit(0); break;            
+            
+            case SDLK_RSHIFT:
+            case SDLK_LSHIFT:
+              trackball.ButtonUp(Trackball::KEY_SHIFT);
+              break;
+
+            case SDLK_RCTRL:
+            case SDLK_LCTRL:
+              trackball.ButtonUp(Trackball::KEY_CTRL);
+              break;
+
+            case SDLK_RALT:
+            case SDLK_LALT:
+              trackball.ButtonUp(Trackball::KEY_ALT);
+              break;
+          }
+          break;
+        case SDL_MOUSEBUTTONDOWN:       
+          x = event.button.x;
+          y = event.button.y;          
+          trackball.MouseDown(x, y, Trackball::BUTTON_LEFT);
+        break;
+        case SDL_MOUSEBUTTONUP:          
+          x = event.button.x;
+          y = event.button.y;          
+          trackball.MouseUp(x, y, Trackball::BUTTON_LEFT);
+          break;
+        case SDL_MOUSEMOTION: 
+          while(SDL_PeepEvents(&event, 1, SDL_GETEVENT, SDL_MOUSEMOTIONMASK));
+          x = event.motion.x;
+          y = event.motion.y;
+          trackball.MouseMove(x, y);        
+          break;  
+      }
+        
+    }
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    gluPerspective(60, 1, 0.1, 100);
+	  glMatrixMode(GL_MODELVIEW);
+	  glLoadIdentity();
+	  gluLookAt(0,0,4,   0,0,0,   0,1,0);        
+    glRotatef(130, 1, 1, 0);
+    glTranslatef(0, 0.7, 1);
+    
+    
+    trackball.SetPosition(Similarityf(Point3f(1, 0, 0)));
+    trackball.local.sca = 0.5;
+    trackball.GetView();
+    trackball.Apply();
+    trackball.Draw();
+
+    glColor3f(0, 1, 0);
+    glutWireCube(1);
+    
+    SDL_GL_SwapBuffers();
+  }
+
+        
+  // Clean up
+  SDL_Quit();
+  
+
   return -1;
-}
\ No newline at end of file
+}
+  */
\ No newline at end of file
diff --git a/apps/test/trackball/trackball.vcproj b/apps/test/trackball/trackball.vcproj
index 1eadb49d..143d750b 100644
--- a/apps/test/trackball/trackball.vcproj
+++ b/apps/test/trackball/trackball.vcproj
@@ -20,6 +20,7 @@
 			<Tool
 				Name="VCCLCompilerTool"
 				Optimization="0"
+				AdditionalIncludeDirectories="c:\sf\vcg"
 				PreprocessorDefinitions="WIN32;_DEBUG"
 				MinimalRebuild="FALSE"
 				BasicRuntimeChecks="0"
@@ -30,6 +31,7 @@
 				Name="VCCustomBuildTool"/>
 			<Tool
 				Name="VCLinkerTool"
+				AdditionalDependencies="opengl32.lib glu32.lib glut32.lib SDL.lib"
 				OutputFile="$(OutDir)/trackball.exe"
 				LinkIncremental="2"
 				GenerateDebugInformation="TRUE"/>
@@ -59,6 +61,7 @@
 				Name="VCCLCompilerTool"
 				Optimization="2"
 				InlineFunctionExpansion="1"
+				AdditionalIncludeDirectories="c:\sf\vcg"
 				PreprocessorDefinitions="WIN32;NDEBUG"
 				MinimalRebuild="FALSE"
 				WarningLevel="3"/>
@@ -66,6 +69,7 @@
 				Name="VCCustomBuildTool"/>
 			<Tool
 				Name="VCLinkerTool"
+				AdditionalDependencies="opengl32.lib glu32.lib glut32.lib SDL.lib"
 				OutputFile="$(OutDir)/trackball.exe"
 				LinkIncremental="1"
 				GenerateDebugInformation="TRUE"/>
@@ -89,10 +93,46 @@
 		<Filter
 			Name="Source Files"
 			Filter="cpp;c;cxx;def;odl;idl;hpj;bat;asm">
+			<File
+				RelativePath="main.cpp">
+			</File>
 		</Filter>
 		<Filter
 			Name="Header Files"
 			Filter="h;hpp;hxx;hm;inl;inc">
+			<File
+				RelativePath="..\..\..\vcg\math\base.h">
+			</File>
+			<File
+				RelativePath="..\..\..\vcg\space\box3.h">
+			</File>
+			<File
+				RelativePath="..\..\..\wrap\GUI\frustum.h">
+			</File>
+			<File
+				RelativePath="..\..\..\vcg\math\matrix44.h">
+			</File>
+			<File
+				RelativePath="..\..\..\vcg\space\point3.h">
+			</File>
+			<File
+				RelativePath="..\..\..\vcg\math\quaternion.h">
+			</File>
+			<File
+				RelativePath="..\..\..\vcg\math\similarity.h">
+			</File>
+			<File
+				RelativePath="..\..\..\wrap\GUI\trackball.h">
+			</File>
+			<File
+				RelativePath="..\..\..\wrap\GUI\trackmode.h">
+			</File>
+			<File
+				RelativePath="..\..\..\wrap\GUI\view.h">
+			</File>
+			<File
+				RelativePath="..\..\..\wrap\gl\wrap.h">
+			</File>
 		</Filter>
 		<Filter
 			Name="Resource Files"
diff --git a/vcg/math/similarity.h b/vcg/math/similarity.h
index 3ddba055..67acdaa6 100644
--- a/vcg/math/similarity.h
+++ b/vcg/math/similarity.h
@@ -38,10 +38,13 @@ namespace vcg {
 template <class S> class Similarity {
 public:
   Similarity() {}
+  Similarity(const Quaternion<S> &q) { SetRotate(q); }
+  Similarity(const Point3<S> &p) { SetTranslate(p); }
+  Similarity(S s) { SetScale(s); }
   
   Similarity operator*(const Similarity &affine) const;
   Similarity &operator*=(const Similarity &affine);
-  Point3<S> operator*(const Point3<S> &p) const;
+  //Point3<S> operator*(const Point3<S> &p) const;
   
   
   Similarity &SetIdentity();
@@ -61,6 +64,7 @@ public:
 
 template <class S> Similarity<S> &Invert(Similarity<S> &m);
 template <class S> Similarity<S> Inverse(const Similarity<S> &m);
+template <class S> Point3<S> operator*(const Point3<S> &p, const Similarity<S> &m);
 
 
 template <class S> Similarity<S> Similarity<S>::operator*(const Similarity &a) const {
@@ -77,13 +81,6 @@ template <class S> Similarity<S> &Similarity<S>::operator*=(const Similarity &a)
   tra = (rot.Rotate(a.tra)) * sca + tra;
   return *this;
 }
-
-template <class S> Point3<S> Similarity<S>::operator*(const Point3<S> &p) const {
-  Point3<S> r = rot.Rotate(p);
-  r *= sca;
-  r += tra;
-  return r;
-}
   
 template <class S> Similarity<S> &Similarity<S>::SetIdentity() {
   rot.FromAxis(0, Point3<S>(1, 0, 0));
@@ -127,7 +124,7 @@ template <class S> Matrix44<S> Similarity<S>::Matrix() const {
 }
 
 template <class S> void Similarity<S>::FromMatrix(const Matrix44<S> &m) {
-  sca = pow(m.Determinant(), 1/3);  
+  sca = (S)pow(m.Determinant(), 1/3);  
   assert(sca != 0);
   Matrix44<S> t = m * Matrix44<S>().SetScale(1/sca, 1/sca, 1/sca);
   rot.FromMatrix(t);
@@ -157,6 +154,13 @@ template <class S> Similarity<S> Interpolate(const Similarity<S> &a, const Simil
   return r;
 }
 
+template <class S> Point3<S> operator*(const Point3<S> &p, const Similarity<S> &m) {
+  Point3<S> r = m.rot.Rotate(p);
+  r *= m.sca;
+  r += m.tra;
+  return r;
+}
+
 typedef Similarity<float> Similarityf;
 typedef Similarity<double>Similarityd;