diff --git a/py_tutorials/csg_first_example.py b/py_tutorials/csg_first_example.py
index fc623b28..3f9c50ad 100644
--- a/py_tutorials/csg_first_example.py
+++ b/py_tutorials/csg_first_example.py
@@ -1,9 +1,9 @@
 from netgen.csg import *
 import netgen.meshing as meshing
 
-from OpenGL.GL import *
-from OpenGL.GLU import *
-from OpenGL.GLUT import *
+#from OpenGL.GL import *
+#from OpenGL.GLU import *
+#from OpenGL.GLUT import *
 
 
 
@@ -11,10 +11,8 @@ sp1 = Sphere (Pnt(0,0,0), 0.2)
 sp2 = Sphere (Pnt(0.5,0,0), 0.2)
 sp3 = Sphere (Pnt(0,0,0.5), 0.2)
 sp4 = Sphere (Pnt(0,0.2,0.7), 0.2)
-sp5 = Sphere (Pnt(0,0,0.3), 0.2)
 
-
-all = sp1+sp2+sp3+sp4+sp5
+all = sp1+sp2+sp3+sp4
 
 
 geom = CSGeometry()
@@ -22,32 +20,26 @@ geom.Add (all)
 
 
 
-vis = VS(geom)
+#vis = VS(geom)
 # vis.Draw()
 
 
-window = 0                                             # glut window number
-width, height = 500, 500
+#window = 0                                             # glut window number
+#width, height = 500, 500
 
 
 
-def mydraw():
-
-    glViewport(0, 0, width, height);
-
-    glMatrixMode(GL_PROJECTION);
-    glLoadIdentity();
-    
-    pnear = 0.1;
-    pfar = 10;
-
-    gluPerspective(20.0, 1.0*width / height, pnear, pfar);
-    glMatrixMode(GL_MODELVIEW);
-    
-    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
+#def mydraw():
+#    glViewport(0, 0, width, height);
+#    glMatrixMode(GL_PROJECTION);
+#    glLoadIdentity();
+#    pnear = 0.1;
+#    pfar = 10;
+#    gluPerspective(20.0, 1.0*width / height, pnear, pfar);
+#    glMatrixMode(GL_MODELVIEW);    
+#    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
 #    glLoadIdentity()
 #    gluLookAt (0, 0, 6, 0, 0, 0, 0, 1, 0);
-    
 ##    glBegin(GL_QUADS)
 ##    glColor4d(0.0, 1.0, 0.0, 0.0);
 ##    glVertex3d(0.0,0.0,0.7)
@@ -56,26 +48,18 @@ def mydraw():
 ##    glVertex3d(1.0,1.0,0.2)
 ##    glVertex3d(0.0,1.0,0.5)
 ##    glEnd()
-     
-    vis.Draw()
-    
-    glutSwapBuffers()
+#    vis.Draw()
+#    glutSwapBuffers()
 
-
-
-
-
-glutInit("mainwin")                                   # initialize glut
-glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_ALPHA | GLUT_DEPTH)
-glutInitWindowSize(width, height)                      # set window size
-glutInitWindowPosition(0, 0)                           # set window position
-window = glutCreateWindow(b"ngs")                      # create window with title
+#glutInit("mainwin")                                   # initialize glut
+#glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_ALPHA | GLUT_DEPTH)
+#glutInitWindowSize(width, height)                      # set window size
+#glutInitWindowPosition(0, 0)                           # set window position
+#window = glutCreateWindow(b"ngs")                      # create window with title
 #glutDisplayFunc(vis.Draw)                                 # set draw function callback
-glutIdleFunc(mydraw)                                     # draw all the time
-glutMainLoop()        
+#glutIdleFunc(mydraw)                                     # draw all the time
+#glutMainLoop()        
 
-
-
-# param = meshing.MeshingParameters(maxh=0.2)
-# mesh = GenerateMesh (geom, param)
-# mesh.Save ("test.vol")
+param = meshing.MeshingParameters(maxh=0.2)
+mesh = GenerateMesh (geom, param)
+mesh.Save ("test.vol")