diff --git a/Stream_lines_2/test/Stream_lines_2/Stream_line.C b/Stream_lines_2/test/Stream_lines_2/Stream_line.C
index 3f6e167e158..bbff2abc324 100644
--- a/Stream_lines_2/test/Stream_lines_2/Stream_line.C
+++ b/Stream_lines_2/test/Stream_lines_2/Stream_line.C
@@ -28,52 +28,79 @@ typedef Stl_rungk::Point_iterator_2 Point_iterator;
 typedef Stl_rungk::Point_2 Point_2;
 typedef Stl_rungk::Vector_2 Vector_2;
 
+typedef CGAL::Triangular_field_2<K>                                        TRField;
+typedef CGAL::Runge_kutta_integrator_2<TRField>                            TRRunge_kutta_integrator;
+typedef CGAL::Stream_lines_2<TRField, TRRunge_kutta_integrator>            TRStl;
+typedef TRStl::Stream_line_iterator_2                                      TRStl_iterator;
+
+
 int main()
 {
   for (int i=1;i<=23;i++)
+  {
+    char file_name[80];
+    std::sprintf(file_name, "data/%d.vec.cin", i);
+    std::ifstream infile(file_name, std::ios::in);
+    double iXSize, iYSize;
+    unsigned int x_samples, y_samples;
+    iXSize = iYSize = 512;
+    infile >> x_samples;
+    infile >> y_samples;
+    Field regular_grid_2(x_samples, y_samples, iXSize, iYSize);
+    /*fill the grid with the appropriate values*/
+    for (unsigned int i=0;i<x_samples;i++)
+      for (unsigned int j=0;j<y_samples;j++)
     {
-      char file_name[80];
-      std::sprintf(file_name, "data/%d.vec.cin", i);
-      std::ifstream infile(file_name, std::ios::in);
-      double iXSize, iYSize;
-      unsigned int x_samples, y_samples;
-      iXSize = iYSize = 512;
-      infile >> x_samples;
-      infile >> y_samples;
-      Field regular_grid_2(x_samples, y_samples, iXSize, iYSize);
-      /*fill the grid with the appropriate values*/
-      for (unsigned int i=0;i<x_samples;i++)
-	for (unsigned int j=0;j<y_samples;j++)
-	  {
-	    double xval, yval;
-	    infile >> xval;
-	    infile >> yval;
-	    regular_grid_2.set_field(i, j, Vector_2(xval, yval));
-	  }
-      infile.close();
-      std::cout << "processing... (" << file_name << ")\n";
-      /* the placement of streamlines using Runge-Kutta integrator */
-      std::cout << "using Runge-Kutta integrator\n";
-      Runge_kutta_integrator runge_kutta_integrator;
-      double dSep = 3.5;
-      double dRat = 1.6;
-      Stl_rungk Stream_lines_rungk(regular_grid_2, runge_kutta_integrator,dSep,dRat,1);
-      std::cout << "placement generated\n";
-      std::cout << "updating parameters...\n";
-      Stream_lines_rungk.set_separating_distance(12.0);
-      Stream_lines_rungk.set_saturation_ratio(1.7);
-      Stream_lines_rungk.update();
-      std::cout << "placement generated\n";
-      std::ofstream fw("result.stl",std::ios::out);
-      Stream_lines_rungk.print_stream_lines(fw);
-      fw.close();
-      /* the placement of streamlines using Euler integrator */
-      std::cout << "using Runge-Kutta integrator\n";
-      Euler_integrator euler_integrator;
-      dSep = 3.5;
-      dRat = 1.6;
-      Stl_euler Stream_lines(regular_grid_2, euler_integrator,dSep,dRat,1);
-      std::cout << "placement generated\n";
+      double xval, yval;
+      infile >> xval;
+      infile >> yval;
+      regular_grid_2.set_field(i, j, Vector_2(xval, yval));
     }
+    infile.close();
+    std::cout << "processing... (" << file_name << ")\n";
+    /* the placement of streamlines using Runge-Kutta integrator */
+    std::cout << "using Runge-Kutta integrator\n";
+    Runge_kutta_integrator runge_kutta_integrator;
+    double dSep = 3.5;
+    double dRat = 1.6;
+    Stl_rungk Stream_lines_rungk(regular_grid_2, runge_kutta_integrator,dSep,dRat,1);
+    std::cout << "placement generated\n";
+    std::cout << "updating parameters...\n";
+    Stream_lines_rungk.set_separating_distance(12.0);
+    Stream_lines_rungk.set_saturation_ratio(1.7);
+    Stream_lines_rungk.update();
+    std::cout << "placement generated\n";
+    std::ofstream fw("result.stl",std::ios::out);
+    Stream_lines_rungk.print_stream_lines(fw);
+    fw.close();
+    /* the placement of streamlines using Euler integrator */
+    std::cout << "using Euler integrator\n";
+    Euler_integrator euler_integrator;
+    dSep = 3.5;
+    dRat = 1.6;
+    Stl_euler Stream_lines(regular_grid_2, euler_integrator,dSep,dRat,1);
+    std::cout << "placement generated\n";
+  }
+  
+  std::cout << "placement of streamlines on irregular field\n";
+  TRRunge_kutta_integrator trrunge_kutta_integrator(1);
+  std::ifstream inp("data/datap.tri.cin");
+  std::ifstream inv("data/datav.tri.cin");
+  std::istream_iterator<Point_2> beginp(inp);
+  std::istream_iterator<Vector_2> beginv(inv);
+  std::istream_iterator<Point_2> endp;
+  TRField triangular_field(beginp, endp, beginv);
+  /* the placement of streamlines */
+  std::cout << "processing...\n";
+  double dSep = 38.0;
+  double dRat = 1.6;
+  TRStl TRStream_lines(triangular_field, trrunge_kutta_integrator,dSep,dRat);
+  std::cout << "placement generated\n";
+  std::cout << "updating parameters...\n";
+  TRStream_lines.set_separating_distance(45.0);
+  TRStream_lines.set_saturation_ratio(1.7);
+  TRStream_lines.update();
+  std::cout << "placement generated\n";
+  
   std::cout << "success\n";
 }